root / linux-user / elfload.c @ 2a29ca73
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/* This is the Linux kernel elf-loading code, ported into user space */
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <fcntl.h> |
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#include <sys/stat.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "qemu.h" |
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#include "disas.h" |
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#ifdef TARGET_I386
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#define ELF_START_MMAP 0x80000000 |
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typedef uint32_t elf_greg_t;
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#define ELF_NGREG (sizeof (struct target_pt_regs) / sizeof(elf_greg_t)) |
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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typedef struct user_i387_struct elf_fpregset_t; |
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_CLASS ELFCLASS32
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#define ELF_DATA ELFDATA2LSB
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#define ELF_ARCH EM_386
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/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
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starts %edx contains a pointer to a function which might be
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registered using `atexit'. This provides a mean for the
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dynamic linker to call DT_FINI functions for shared libraries
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that have been loaded before the code runs.
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A value of 0 tells we have no such handler. */
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#define ELF_PLAT_INIT(_r) _r->edx = 0 |
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#define USE_ELF_CORE_DUMP
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#define ELF_EXEC_PAGESIZE 4096 |
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#endif
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#include "elf.h" |
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/*
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* MAX_ARG_PAGES defines the number of pages allocated for arguments
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* and envelope for the new program. 32 should suffice, this gives
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* a maximum env+arg of 128kB w/4KB pages!
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*/
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#define MAX_ARG_PAGES 32 |
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/*
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* This structure is used to hold the arguments that are
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* used when loading binaries.
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*/
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struct linux_binprm {
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char buf[128]; |
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unsigned long page[MAX_ARG_PAGES]; |
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unsigned long p; |
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int sh_bang;
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int fd;
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int e_uid, e_gid;
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int argc, envc;
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char * filename; /* Name of binary */ |
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unsigned long loader, exec; |
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int dont_iput; /* binfmt handler has put inode */ |
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}; |
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struct exec
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{ |
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unsigned int a_info; /* Use macros N_MAGIC, etc for access */ |
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unsigned int a_text; /* length of text, in bytes */ |
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unsigned int a_data; /* length of data, in bytes */ |
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unsigned int a_bss; /* length of uninitialized data area, in bytes */ |
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unsigned int a_syms; /* length of symbol table data in file, in bytes */ |
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unsigned int a_entry; /* start address */ |
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unsigned int a_trsize; /* length of relocation info for text, in bytes */ |
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unsigned int a_drsize; /* length of relocation info for data, in bytes */ |
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}; |
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#define N_MAGIC(exec) ((exec).a_info & 0xffff) |
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#define OMAGIC 0407 |
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#define NMAGIC 0410 |
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#define ZMAGIC 0413 |
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#define QMAGIC 0314 |
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/* max code+data+bss space allocated to elf interpreter */
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#define INTERP_MAP_SIZE (32 * 1024 * 1024) |
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/* max code+data+bss+brk space allocated to ET_DYN executables */
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#define ET_DYN_MAP_SIZE (128 * 1024 * 1024) |
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/* from personality.h */
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/* Flags for bug emulation. These occupy the top three bytes. */
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#define STICKY_TIMEOUTS 0x4000000 |
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#define WHOLE_SECONDS 0x2000000 |
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/* Personality types. These go in the low byte. Avoid using the top bit,
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* it will conflict with error returns.
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*/
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#define PER_MASK (0x00ff) |
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#define PER_LINUX (0x0000) |
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#define PER_SVR4 (0x0001 | STICKY_TIMEOUTS) |
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#define PER_SVR3 (0x0002 | STICKY_TIMEOUTS) |
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#define PER_SCOSVR3 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS) |
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#define PER_WYSEV386 (0x0004 | STICKY_TIMEOUTS) |
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#define PER_ISCR4 (0x0005 | STICKY_TIMEOUTS) |
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#define PER_BSD (0x0006) |
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#define PER_XENIX (0x0007 | STICKY_TIMEOUTS) |
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/* Necessary parameters */
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#define NGROUPS 32 |
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#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
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#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1)) |
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#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) |
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#define INTERPRETER_NONE 0 |
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#define INTERPRETER_AOUT 1 |
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#define INTERPRETER_ELF 2 |
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#define DLINFO_ITEMS 12 |
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#define put_user(x,ptr) (void)(*(ptr) = (typeof(*ptr))(x)) |
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#define get_user(ptr) (typeof(*ptr))(*(ptr))
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static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) |
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{ |
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memcpy(to, from, n); |
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} |
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static inline void memcpy_tofs(void * to, const void * from, unsigned long n) |
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{ |
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memcpy(to, from, n); |
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} |
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extern unsigned long x86_stack_size; |
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static int load_aout_interp(void * exptr, int interp_fd); |
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#ifdef BSWAP_NEEDED
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static void bswap_ehdr(Elf32_Ehdr *ehdr) |
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{ |
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bswap16s(&ehdr->e_type); /* Object file type */
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bswap16s(&ehdr->e_machine); /* Architecture */
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bswap32s(&ehdr->e_version); /* Object file version */
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bswap32s(&ehdr->e_entry); /* Entry point virtual address */
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bswap32s(&ehdr->e_phoff); /* Program header table file offset */
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bswap32s(&ehdr->e_shoff); /* Section header table file offset */
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bswap32s(&ehdr->e_flags); /* Processor-specific flags */
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bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
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bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
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bswap16s(&ehdr->e_phnum); /* Program header table entry count */
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bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
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bswap16s(&ehdr->e_shnum); /* Section header table entry count */
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bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
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} |
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static void bswap_phdr(Elf32_Phdr *phdr) |
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{ |
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bswap32s(&phdr->p_type); /* Segment type */
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bswap32s(&phdr->p_offset); /* Segment file offset */
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bswap32s(&phdr->p_vaddr); /* Segment virtual address */
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bswap32s(&phdr->p_paddr); /* Segment physical address */
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bswap32s(&phdr->p_filesz); /* Segment size in file */
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bswap32s(&phdr->p_memsz); /* Segment size in memory */
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bswap32s(&phdr->p_flags); /* Segment flags */
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bswap32s(&phdr->p_align); /* Segment alignment */
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} |
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static void bswap_shdr(Elf32_Shdr *shdr) |
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{ |
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bswap32s(&shdr->sh_name); |
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bswap32s(&shdr->sh_type); |
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bswap32s(&shdr->sh_flags); |
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bswap32s(&shdr->sh_addr); |
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bswap32s(&shdr->sh_offset); |
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bswap32s(&shdr->sh_size); |
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bswap32s(&shdr->sh_link); |
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bswap32s(&shdr->sh_info); |
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bswap32s(&shdr->sh_addralign); |
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bswap32s(&shdr->sh_entsize); |
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} |
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static void bswap_sym(Elf32_Sym *sym) |
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{ |
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bswap32s(&sym->st_name); |
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bswap32s(&sym->st_value); |
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bswap32s(&sym->st_size); |
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bswap16s(&sym->st_shndx); |
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} |
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#endif
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static void * get_free_page(void) |
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{ |
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void * retval;
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/* User-space version of kernel get_free_page. Returns a page-aligned
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* page-sized chunk of memory.
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*/
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retval = (void *)target_mmap(0, host_page_size, PROT_READ|PROT_WRITE, |
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MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
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if((long)retval == -1) { |
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perror("get_free_page");
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exit(-1);
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} |
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else {
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return(retval);
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} |
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} |
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static void free_page(void * pageaddr) |
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{ |
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target_munmap((unsigned long)pageaddr, host_page_size); |
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} |
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/*
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* 'copy_string()' copies argument/envelope strings from user
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* memory to free pages in kernel mem. These are in a format ready
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* to be put directly into the top of new user memory.
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*
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*/
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static unsigned long copy_strings(int argc,char ** argv,unsigned long *page, |
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unsigned long p) |
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{ |
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char *tmp, *tmp1, *pag = NULL; |
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int len, offset = 0; |
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if (!p) {
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return 0; /* bullet-proofing */ |
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} |
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while (argc-- > 0) { |
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if (!(tmp1 = tmp = get_user(argv+argc))) {
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fprintf(stderr, "VFS: argc is wrong");
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exit(-1);
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} |
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while (get_user(tmp++));
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len = tmp - tmp1; |
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if (p < len) { /* this shouldn't happen - 128kB */ |
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return 0; |
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} |
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while (len) {
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--p; --tmp; --len; |
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if (--offset < 0) { |
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offset = p % TARGET_PAGE_SIZE; |
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if (!(pag = (char *) page[p/TARGET_PAGE_SIZE]) && |
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!(pag = (char *) page[p/TARGET_PAGE_SIZE] =
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(unsigned long *) get_free_page())) { |
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return 0; |
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} |
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} |
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if (len == 0 || offset == 0) { |
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*(pag + offset) = get_user(tmp); |
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} |
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else {
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int bytes_to_copy = (len > offset) ? offset : len;
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tmp -= bytes_to_copy; |
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p -= bytes_to_copy; |
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offset -= bytes_to_copy; |
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len -= bytes_to_copy; |
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memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
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} |
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} |
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} |
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return p;
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} |
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static int in_group_p(gid_t g) |
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{ |
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/* return TRUE if we're in the specified group, FALSE otherwise */
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int ngroup;
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int i;
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gid_t grouplist[NGROUPS]; |
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ngroup = getgroups(NGROUPS, grouplist); |
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for(i = 0; i < ngroup; i++) { |
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if(grouplist[i] == g) {
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return 1; |
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} |
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} |
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return 0; |
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} |
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static int count(char ** vec) |
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{ |
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int i;
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for(i = 0; *vec; i++) { |
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vec++; |
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} |
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return(i);
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} |
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static int prepare_binprm(struct linux_binprm *bprm) |
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{ |
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struct stat st;
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int mode;
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int retval, id_change;
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if(fstat(bprm->fd, &st) < 0) { |
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return(-errno);
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} |
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mode = st.st_mode; |
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if(!S_ISREG(mode)) { /* Must be regular file */ |
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return(-EACCES);
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} |
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if(!(mode & 0111)) { /* Must have at least one execute bit set */ |
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return(-EACCES);
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} |
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bprm->e_uid = geteuid(); |
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bprm->e_gid = getegid(); |
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id_change = 0;
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/* Set-uid? */
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if(mode & S_ISUID) {
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bprm->e_uid = st.st_uid; |
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if(bprm->e_uid != geteuid()) {
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id_change = 1;
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} |
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} |
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/* Set-gid? */
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/*
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* If setgid is set but no group execute bit then this
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* is a candidate for mandatory locking, not a setgid
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* executable.
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*/
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if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
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bprm->e_gid = st.st_gid; |
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if (!in_group_p(bprm->e_gid)) {
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id_change = 1;
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} |
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} |
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memset(bprm->buf, 0, sizeof(bprm->buf)); |
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retval = lseek(bprm->fd, 0L, SEEK_SET);
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if(retval >= 0) { |
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retval = read(bprm->fd, bprm->buf, 128);
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} |
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if(retval < 0) { |
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perror("prepare_binprm");
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exit(-1);
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/* return(-errno); */
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} |
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else {
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return(retval);
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} |
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} |
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unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, |
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struct image_info * info)
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{ |
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unsigned long stack_base, size, error; |
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int i;
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/* Create enough stack to hold everything. If we don't use
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* it for args, we'll use it for something else...
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*/
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size = x86_stack_size; |
376 |
if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
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size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
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error = target_mmap(0,
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size + host_page_size, |
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PROT_READ | PROT_WRITE, |
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MAP_PRIVATE | MAP_ANONYMOUS, |
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-1, 0); |
383 |
if (error == -1) { |
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perror("stk mmap");
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exit(-1);
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} |
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/* we reserve one extra page at the top of the stack as guard */
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target_mprotect(error + size, host_page_size, PROT_NONE); |
389 |
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stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
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p += stack_base; |
392 |
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if (bprm->loader) {
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bprm->loader += stack_base; |
395 |
} |
396 |
bprm->exec += stack_base; |
397 |
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for (i = 0 ; i < MAX_ARG_PAGES ; i++) { |
399 |
if (bprm->page[i]) {
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info->rss++; |
401 |
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memcpy((void *)stack_base, (void *)bprm->page[i], TARGET_PAGE_SIZE); |
403 |
free_page((void *)bprm->page[i]);
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} |
405 |
stack_base += TARGET_PAGE_SIZE; |
406 |
} |
407 |
return p;
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} |
409 |
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static void set_brk(unsigned long start, unsigned long end) |
411 |
{ |
412 |
/* page-align the start and end addresses... */
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start = HOST_PAGE_ALIGN(start); |
414 |
end = HOST_PAGE_ALIGN(end); |
415 |
if (end <= start)
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return;
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if(target_mmap(start, end - start,
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PROT_READ | PROT_WRITE | PROT_EXEC, |
419 |
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { |
420 |
perror("cannot mmap brk");
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exit(-1);
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} |
423 |
} |
424 |
|
425 |
|
426 |
/* We need to explicitly zero any fractional pages
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after the data section (i.e. bss). This would
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contain the junk from the file that should not
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be in memory */
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430 |
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431 |
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432 |
static void padzero(unsigned long elf_bss) |
433 |
{ |
434 |
unsigned long nbyte; |
435 |
char * fpnt;
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436 |
|
437 |
nbyte = elf_bss & (host_page_size-1); /* was TARGET_PAGE_SIZE - JRP */ |
438 |
if (nbyte) {
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439 |
nbyte = host_page_size - nbyte; |
440 |
fpnt = (char *) elf_bss;
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441 |
do {
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442 |
*fpnt++ = 0;
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443 |
} while (--nbyte);
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444 |
} |
445 |
} |
446 |
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447 |
static unsigned int * create_elf_tables(char *p, int argc, int envc, |
448 |
struct elfhdr * exec,
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449 |
unsigned long load_addr, |
450 |
unsigned long load_bias, |
451 |
unsigned long interp_load_addr, int ibcs, |
452 |
struct image_info *info)
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453 |
{ |
454 |
target_ulong *argv, *envp, *dlinfo; |
455 |
target_ulong *sp; |
456 |
|
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/*
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* Force 16 byte alignment here for generality.
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*/
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460 |
sp = (unsigned int *) (~15UL & (unsigned long) p); |
461 |
sp -= exec ? DLINFO_ITEMS*2 : 2; |
462 |
dlinfo = sp; |
463 |
sp -= envc+1;
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envp = sp; |
465 |
sp -= argc+1;
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argv = sp; |
467 |
if (!ibcs) {
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put_user(tswapl((target_ulong)envp),--sp); |
469 |
put_user(tswapl((target_ulong)argv),--sp); |
470 |
} |
471 |
|
472 |
#define NEW_AUX_ENT(id, val) \
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put_user (tswapl(id), dlinfo++); \ |
474 |
put_user (tswapl(val), dlinfo++) |
475 |
|
476 |
if (exec) { /* Put this here for an ELF program interpreter */ |
477 |
NEW_AUX_ENT (AT_PHDR, (target_ulong)(load_addr + exec->e_phoff)); |
478 |
NEW_AUX_ENT (AT_PHENT, (target_ulong)(sizeof (struct elf_phdr))); |
479 |
NEW_AUX_ENT (AT_PHNUM, (target_ulong)(exec->e_phnum)); |
480 |
NEW_AUX_ENT (AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE)); |
481 |
NEW_AUX_ENT (AT_BASE, (target_ulong)(interp_load_addr)); |
482 |
NEW_AUX_ENT (AT_FLAGS, (target_ulong)0);
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483 |
NEW_AUX_ENT (AT_ENTRY, load_bias + exec->e_entry); |
484 |
NEW_AUX_ENT (AT_UID, (target_ulong) getuid()); |
485 |
NEW_AUX_ENT (AT_EUID, (target_ulong) geteuid()); |
486 |
NEW_AUX_ENT (AT_GID, (target_ulong) getgid()); |
487 |
NEW_AUX_ENT (AT_EGID, (target_ulong) getegid()); |
488 |
} |
489 |
NEW_AUX_ENT (AT_NULL, 0);
|
490 |
#undef NEW_AUX_ENT
|
491 |
put_user(tswapl(argc),--sp); |
492 |
info->arg_start = (unsigned int)((unsigned long)p & 0xffffffff); |
493 |
while (argc-->0) { |
494 |
put_user(tswapl((target_ulong)p),argv++); |
495 |
while (get_user(p++)) /* nothing */ ; |
496 |
} |
497 |
put_user(0,argv);
|
498 |
info->arg_end = info->env_start = (unsigned int)((unsigned long)p & 0xffffffff); |
499 |
while (envc-->0) { |
500 |
put_user(tswapl((target_ulong)p),envp++); |
501 |
while (get_user(p++)) /* nothing */ ; |
502 |
} |
503 |
put_user(0,envp);
|
504 |
info->env_end = (unsigned int)((unsigned long)p & 0xffffffff); |
505 |
return sp;
|
506 |
} |
507 |
|
508 |
|
509 |
|
510 |
static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, |
511 |
int interpreter_fd,
|
512 |
unsigned long *interp_load_addr) |
513 |
{ |
514 |
struct elf_phdr *elf_phdata = NULL; |
515 |
struct elf_phdr *eppnt;
|
516 |
unsigned long load_addr = 0; |
517 |
int load_addr_set = 0; |
518 |
int retval;
|
519 |
unsigned long last_bss, elf_bss; |
520 |
unsigned long error; |
521 |
int i;
|
522 |
|
523 |
elf_bss = 0;
|
524 |
last_bss = 0;
|
525 |
error = 0;
|
526 |
|
527 |
#ifdef BSWAP_NEEDED
|
528 |
bswap_ehdr(interp_elf_ex); |
529 |
#endif
|
530 |
/* First of all, some simple consistency checks */
|
531 |
if ((interp_elf_ex->e_type != ET_EXEC &&
|
532 |
interp_elf_ex->e_type != ET_DYN) || |
533 |
!elf_check_arch(interp_elf_ex->e_machine)) { |
534 |
return ~0UL; |
535 |
} |
536 |
|
537 |
|
538 |
/* Now read in all of the header information */
|
539 |
|
540 |
if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) |
541 |
return ~0UL; |
542 |
|
543 |
elf_phdata = (struct elf_phdr *)
|
544 |
malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
545 |
|
546 |
if (!elf_phdata)
|
547 |
return ~0UL; |
548 |
|
549 |
/*
|
550 |
* If the size of this structure has changed, then punt, since
|
551 |
* we will be doing the wrong thing.
|
552 |
*/
|
553 |
if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { |
554 |
free(elf_phdata); |
555 |
return ~0UL; |
556 |
} |
557 |
|
558 |
retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
559 |
if(retval >= 0) { |
560 |
retval = read(interpreter_fd, |
561 |
(char *) elf_phdata,
|
562 |
sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
563 |
} |
564 |
if (retval < 0) { |
565 |
perror("load_elf_interp");
|
566 |
exit(-1);
|
567 |
free (elf_phdata); |
568 |
return retval;
|
569 |
} |
570 |
#ifdef BSWAP_NEEDED
|
571 |
eppnt = elf_phdata; |
572 |
for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { |
573 |
bswap_phdr(eppnt); |
574 |
} |
575 |
#endif
|
576 |
|
577 |
if (interp_elf_ex->e_type == ET_DYN) {
|
578 |
/* in order to avoid harcoding the interpreter load
|
579 |
address in qemu, we allocate a big enough memory zone */
|
580 |
error = target_mmap(0, INTERP_MAP_SIZE,
|
581 |
PROT_NONE, MAP_PRIVATE | MAP_ANON, |
582 |
-1, 0); |
583 |
if (error == -1) { |
584 |
perror("mmap");
|
585 |
exit(-1);
|
586 |
} |
587 |
load_addr = error; |
588 |
load_addr_set = 1;
|
589 |
} |
590 |
|
591 |
eppnt = elf_phdata; |
592 |
for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) |
593 |
if (eppnt->p_type == PT_LOAD) {
|
594 |
int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
|
595 |
int elf_prot = 0; |
596 |
unsigned long vaddr = 0; |
597 |
unsigned long k; |
598 |
|
599 |
if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
|
600 |
if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
601 |
if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
602 |
if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
|
603 |
elf_type |= MAP_FIXED; |
604 |
vaddr = eppnt->p_vaddr; |
605 |
} |
606 |
error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), |
607 |
eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), |
608 |
elf_prot, |
609 |
elf_type, |
610 |
interpreter_fd, |
611 |
eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); |
612 |
|
613 |
if (error > -1024UL) { |
614 |
/* Real error */
|
615 |
close(interpreter_fd); |
616 |
free(elf_phdata); |
617 |
return ~0UL; |
618 |
} |
619 |
|
620 |
if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
|
621 |
load_addr = error; |
622 |
load_addr_set = 1;
|
623 |
} |
624 |
|
625 |
/*
|
626 |
* Find the end of the file mapping for this phdr, and keep
|
627 |
* track of the largest address we see for this.
|
628 |
*/
|
629 |
k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; |
630 |
if (k > elf_bss) elf_bss = k;
|
631 |
|
632 |
/*
|
633 |
* Do the same thing for the memory mapping - between
|
634 |
* elf_bss and last_bss is the bss section.
|
635 |
*/
|
636 |
k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; |
637 |
if (k > last_bss) last_bss = k;
|
638 |
} |
639 |
|
640 |
/* Now use mmap to map the library into memory. */
|
641 |
|
642 |
close(interpreter_fd); |
643 |
|
644 |
/*
|
645 |
* Now fill out the bss section. First pad the last page up
|
646 |
* to the page boundary, and then perform a mmap to make sure
|
647 |
* that there are zeromapped pages up to and including the last
|
648 |
* bss page.
|
649 |
*/
|
650 |
padzero(elf_bss); |
651 |
elf_bss = TARGET_ELF_PAGESTART(elf_bss + host_page_size - 1); /* What we have mapped so far */ |
652 |
|
653 |
/* Map the last of the bss segment */
|
654 |
if (last_bss > elf_bss) {
|
655 |
target_mmap(elf_bss, last_bss-elf_bss, |
656 |
PROT_READ|PROT_WRITE|PROT_EXEC, |
657 |
MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
658 |
} |
659 |
free(elf_phdata); |
660 |
|
661 |
*interp_load_addr = load_addr; |
662 |
return ((unsigned long) interp_elf_ex->e_entry) + load_addr; |
663 |
} |
664 |
|
665 |
/* Best attempt to load symbols from this ELF object. */
|
666 |
static void load_symbols(struct elfhdr *hdr, int fd) |
667 |
{ |
668 |
unsigned int i; |
669 |
struct elf_shdr sechdr, symtab, strtab;
|
670 |
char *strings;
|
671 |
|
672 |
lseek(fd, hdr->e_shoff, SEEK_SET); |
673 |
for (i = 0; i < hdr->e_shnum; i++) { |
674 |
if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) |
675 |
return;
|
676 |
#ifdef BSWAP_NEEDED
|
677 |
bswap_shdr(&sechdr); |
678 |
#endif
|
679 |
if (sechdr.sh_type == SHT_SYMTAB) {
|
680 |
symtab = sechdr; |
681 |
lseek(fd, hdr->e_shoff |
682 |
+ sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
|
683 |
if (read(fd, &strtab, sizeof(strtab)) |
684 |
!= sizeof(strtab))
|
685 |
return;
|
686 |
#ifdef BSWAP_NEEDED
|
687 |
bswap_shdr(&strtab); |
688 |
#endif
|
689 |
goto found;
|
690 |
} |
691 |
} |
692 |
return; /* Shouldn't happen... */ |
693 |
|
694 |
found:
|
695 |
/* Now know where the strtab and symtab are. Snarf them. */
|
696 |
disas_symtab = malloc(symtab.sh_size); |
697 |
disas_strtab = strings = malloc(strtab.sh_size); |
698 |
if (!disas_symtab || !disas_strtab)
|
699 |
return;
|
700 |
|
701 |
lseek(fd, symtab.sh_offset, SEEK_SET); |
702 |
if (read(fd, disas_symtab, symtab.sh_size) != symtab.sh_size)
|
703 |
return;
|
704 |
|
705 |
#ifdef BSWAP_NEEDED
|
706 |
for (i = 0; i < symtab.sh_size / sizeof(struct elf_sym); i++) |
707 |
bswap_sym(disas_symtab + sizeof(struct elf_sym)*i); |
708 |
#endif
|
709 |
|
710 |
lseek(fd, strtab.sh_offset, SEEK_SET); |
711 |
if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
|
712 |
return;
|
713 |
disas_num_syms = symtab.sh_size / sizeof(struct elf_sym); |
714 |
} |
715 |
|
716 |
static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
717 |
struct image_info * info)
|
718 |
{ |
719 |
struct elfhdr elf_ex;
|
720 |
struct elfhdr interp_elf_ex;
|
721 |
struct exec interp_ex;
|
722 |
int interpreter_fd = -1; /* avoid warning */ |
723 |
unsigned long load_addr, load_bias; |
724 |
int load_addr_set = 0; |
725 |
unsigned int interpreter_type = INTERPRETER_NONE; |
726 |
unsigned char ibcs2_interpreter; |
727 |
int i;
|
728 |
unsigned long mapped_addr; |
729 |
struct elf_phdr * elf_ppnt;
|
730 |
struct elf_phdr *elf_phdata;
|
731 |
unsigned long elf_bss, k, elf_brk; |
732 |
int retval;
|
733 |
char * elf_interpreter;
|
734 |
unsigned long elf_entry, interp_load_addr = 0; |
735 |
int status;
|
736 |
unsigned long start_code, end_code, end_data; |
737 |
unsigned long elf_stack; |
738 |
char passed_fileno[6]; |
739 |
|
740 |
ibcs2_interpreter = 0;
|
741 |
status = 0;
|
742 |
load_addr = 0;
|
743 |
load_bias = 0;
|
744 |
elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ |
745 |
#ifdef BSWAP_NEEDED
|
746 |
bswap_ehdr(&elf_ex); |
747 |
#endif
|
748 |
|
749 |
if (elf_ex.e_ident[0] != 0x7f || |
750 |
strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) { |
751 |
return -ENOEXEC;
|
752 |
} |
753 |
|
754 |
/* First of all, some simple consistency checks */
|
755 |
if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
|
756 |
(! elf_check_arch(elf_ex.e_machine))) { |
757 |
return -ENOEXEC;
|
758 |
} |
759 |
|
760 |
/* Now read in all of the header information */
|
761 |
|
762 |
elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
|
763 |
if (elf_phdata == NULL) { |
764 |
return -ENOMEM;
|
765 |
} |
766 |
|
767 |
retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); |
768 |
if(retval > 0) { |
769 |
retval = read(bprm->fd, (char *) elf_phdata,
|
770 |
elf_ex.e_phentsize * elf_ex.e_phnum); |
771 |
} |
772 |
|
773 |
if (retval < 0) { |
774 |
perror("load_elf_binary");
|
775 |
exit(-1);
|
776 |
free (elf_phdata); |
777 |
return -errno;
|
778 |
} |
779 |
|
780 |
#ifdef BSWAP_NEEDED
|
781 |
elf_ppnt = elf_phdata; |
782 |
for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { |
783 |
bswap_phdr(elf_ppnt); |
784 |
} |
785 |
#endif
|
786 |
elf_ppnt = elf_phdata; |
787 |
|
788 |
elf_bss = 0;
|
789 |
elf_brk = 0;
|
790 |
|
791 |
|
792 |
elf_stack = ~0UL;
|
793 |
elf_interpreter = NULL;
|
794 |
start_code = ~0UL;
|
795 |
end_code = 0;
|
796 |
end_data = 0;
|
797 |
|
798 |
for(i=0;i < elf_ex.e_phnum; i++) { |
799 |
if (elf_ppnt->p_type == PT_INTERP) {
|
800 |
if ( elf_interpreter != NULL ) |
801 |
{ |
802 |
free (elf_phdata); |
803 |
free(elf_interpreter); |
804 |
close(bprm->fd); |
805 |
return -EINVAL;
|
806 |
} |
807 |
|
808 |
/* This is the program interpreter used for
|
809 |
* shared libraries - for now assume that this
|
810 |
* is an a.out format binary
|
811 |
*/
|
812 |
|
813 |
elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
|
814 |
|
815 |
if (elf_interpreter == NULL) { |
816 |
free (elf_phdata); |
817 |
close(bprm->fd); |
818 |
return -ENOMEM;
|
819 |
} |
820 |
|
821 |
retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); |
822 |
if(retval >= 0) { |
823 |
retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
824 |
} |
825 |
if(retval < 0) { |
826 |
perror("load_elf_binary2");
|
827 |
exit(-1);
|
828 |
} |
829 |
|
830 |
/* If the program interpreter is one of these two,
|
831 |
then assume an iBCS2 image. Otherwise assume
|
832 |
a native linux image. */
|
833 |
|
834 |
/* JRP - Need to add X86 lib dir stuff here... */
|
835 |
|
836 |
if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || |
837 |
strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { |
838 |
ibcs2_interpreter = 1;
|
839 |
} |
840 |
|
841 |
#if 0
|
842 |
printf("Using ELF interpreter %s\n", elf_interpreter);
|
843 |
#endif
|
844 |
if (retval >= 0) { |
845 |
retval = open(path(elf_interpreter), O_RDONLY); |
846 |
if(retval >= 0) { |
847 |
interpreter_fd = retval; |
848 |
} |
849 |
else {
|
850 |
perror(elf_interpreter); |
851 |
exit(-1);
|
852 |
/* retval = -errno; */
|
853 |
} |
854 |
} |
855 |
|
856 |
if (retval >= 0) { |
857 |
retval = lseek(interpreter_fd, 0, SEEK_SET);
|
858 |
if(retval >= 0) { |
859 |
retval = read(interpreter_fd,bprm->buf,128);
|
860 |
} |
861 |
} |
862 |
if (retval >= 0) { |
863 |
interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ |
864 |
interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */ |
865 |
} |
866 |
if (retval < 0) { |
867 |
perror("load_elf_binary3");
|
868 |
exit(-1);
|
869 |
free (elf_phdata); |
870 |
free(elf_interpreter); |
871 |
close(bprm->fd); |
872 |
return retval;
|
873 |
} |
874 |
} |
875 |
elf_ppnt++; |
876 |
} |
877 |
|
878 |
/* Some simple consistency checks for the interpreter */
|
879 |
if (elf_interpreter){
|
880 |
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; |
881 |
|
882 |
/* Now figure out which format our binary is */
|
883 |
if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
|
884 |
(N_MAGIC(interp_ex) != QMAGIC)) { |
885 |
interpreter_type = INTERPRETER_ELF; |
886 |
} |
887 |
|
888 |
if (interp_elf_ex.e_ident[0] != 0x7f || |
889 |
strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) { |
890 |
interpreter_type &= ~INTERPRETER_ELF; |
891 |
} |
892 |
|
893 |
if (!interpreter_type) {
|
894 |
free(elf_interpreter); |
895 |
free(elf_phdata); |
896 |
close(bprm->fd); |
897 |
return -ELIBBAD;
|
898 |
} |
899 |
} |
900 |
|
901 |
/* OK, we are done with that, now set up the arg stuff,
|
902 |
and then start this sucker up */
|
903 |
|
904 |
if (!bprm->sh_bang) {
|
905 |
char * passed_p;
|
906 |
|
907 |
if (interpreter_type == INTERPRETER_AOUT) {
|
908 |
sprintf(passed_fileno, "%d", bprm->fd);
|
909 |
passed_p = passed_fileno; |
910 |
|
911 |
if (elf_interpreter) {
|
912 |
bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
|
913 |
bprm->argc++; |
914 |
} |
915 |
} |
916 |
if (!bprm->p) {
|
917 |
if (elf_interpreter) {
|
918 |
free(elf_interpreter); |
919 |
} |
920 |
free (elf_phdata); |
921 |
close(bprm->fd); |
922 |
return -E2BIG;
|
923 |
} |
924 |
} |
925 |
|
926 |
/* OK, This is the point of no return */
|
927 |
info->end_data = 0;
|
928 |
info->end_code = 0;
|
929 |
info->start_mmap = (unsigned long)ELF_START_MMAP; |
930 |
info->mmap = 0;
|
931 |
elf_entry = (unsigned long) elf_ex.e_entry; |
932 |
|
933 |
/* Do this so that we can load the interpreter, if need be. We will
|
934 |
change some of these later */
|
935 |
info->rss = 0;
|
936 |
bprm->p = setup_arg_pages(bprm->p, bprm, info); |
937 |
info->start_stack = bprm->p; |
938 |
|
939 |
/* Now we do a little grungy work by mmaping the ELF image into
|
940 |
* the correct location in memory. At this point, we assume that
|
941 |
* the image should be loaded at fixed address, not at a variable
|
942 |
* address.
|
943 |
*/
|
944 |
|
945 |
for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
946 |
int elf_prot = 0; |
947 |
int elf_flags = 0; |
948 |
unsigned long error; |
949 |
|
950 |
if (elf_ppnt->p_type != PT_LOAD)
|
951 |
continue;
|
952 |
|
953 |
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
|
954 |
if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
955 |
if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
956 |
elf_flags = MAP_PRIVATE | MAP_DENYWRITE; |
957 |
if (elf_ex.e_type == ET_EXEC || load_addr_set) {
|
958 |
elf_flags |= MAP_FIXED; |
959 |
} else if (elf_ex.e_type == ET_DYN) { |
960 |
/* Try and get dynamic programs out of the way of the default mmap
|
961 |
base, as well as whatever program they might try to exec. This
|
962 |
is because the brk will follow the loader, and is not movable. */
|
963 |
/* NOTE: for qemu, we do a big mmap to get enough space
|
964 |
without harcoding any address */
|
965 |
error = target_mmap(0, ET_DYN_MAP_SIZE,
|
966 |
PROT_NONE, MAP_PRIVATE | MAP_ANON, |
967 |
-1, 0); |
968 |
if (error == -1) { |
969 |
perror("mmap");
|
970 |
exit(-1);
|
971 |
} |
972 |
load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); |
973 |
} |
974 |
|
975 |
error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), |
976 |
(elf_ppnt->p_filesz + |
977 |
TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), |
978 |
elf_prot, |
979 |
(MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), |
980 |
bprm->fd, |
981 |
(elf_ppnt->p_offset - |
982 |
TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); |
983 |
if (error == -1) { |
984 |
perror("mmap");
|
985 |
exit(-1);
|
986 |
} |
987 |
|
988 |
#ifdef LOW_ELF_STACK
|
989 |
if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
|
990 |
elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); |
991 |
#endif
|
992 |
|
993 |
if (!load_addr_set) {
|
994 |
load_addr_set = 1;
|
995 |
load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; |
996 |
if (elf_ex.e_type == ET_DYN) {
|
997 |
load_bias += error - |
998 |
TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); |
999 |
load_addr += load_bias; |
1000 |
} |
1001 |
} |
1002 |
k = elf_ppnt->p_vaddr; |
1003 |
if (k < start_code)
|
1004 |
start_code = k; |
1005 |
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
1006 |
if (k > elf_bss)
|
1007 |
elf_bss = k; |
1008 |
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
|
1009 |
end_code = k; |
1010 |
if (end_data < k)
|
1011 |
end_data = k; |
1012 |
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
1013 |
if (k > elf_brk) elf_brk = k;
|
1014 |
} |
1015 |
|
1016 |
elf_entry += load_bias; |
1017 |
elf_bss += load_bias; |
1018 |
elf_brk += load_bias; |
1019 |
start_code += load_bias; |
1020 |
end_code += load_bias; |
1021 |
// start_data += load_bias;
|
1022 |
end_data += load_bias; |
1023 |
|
1024 |
if (elf_interpreter) {
|
1025 |
if (interpreter_type & 1) { |
1026 |
elf_entry = load_aout_interp(&interp_ex, interpreter_fd); |
1027 |
} |
1028 |
else if (interpreter_type & 2) { |
1029 |
elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
1030 |
&interp_load_addr); |
1031 |
} |
1032 |
|
1033 |
close(interpreter_fd); |
1034 |
free(elf_interpreter); |
1035 |
|
1036 |
if (elf_entry == ~0UL) { |
1037 |
printf("Unable to load interpreter\n");
|
1038 |
free(elf_phdata); |
1039 |
exit(-1);
|
1040 |
return 0; |
1041 |
} |
1042 |
} |
1043 |
|
1044 |
free(elf_phdata); |
1045 |
|
1046 |
if (loglevel)
|
1047 |
load_symbols(&elf_ex, bprm->fd); |
1048 |
|
1049 |
if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
|
1050 |
info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); |
1051 |
|
1052 |
#ifdef LOW_ELF_STACK
|
1053 |
info->start_stack = bprm->p = elf_stack - 4;
|
1054 |
#endif
|
1055 |
bprm->p = (unsigned long) |
1056 |
create_elf_tables((char *)bprm->p,
|
1057 |
bprm->argc, |
1058 |
bprm->envc, |
1059 |
(interpreter_type == INTERPRETER_ELF ? &elf_ex : NULL),
|
1060 |
load_addr, load_bias, |
1061 |
interp_load_addr, |
1062 |
(interpreter_type == INTERPRETER_AOUT ? 0 : 1), |
1063 |
info); |
1064 |
if (interpreter_type == INTERPRETER_AOUT)
|
1065 |
info->arg_start += strlen(passed_fileno) + 1;
|
1066 |
info->start_brk = info->brk = elf_brk; |
1067 |
info->end_code = end_code; |
1068 |
info->start_code = start_code; |
1069 |
info->end_data = end_data; |
1070 |
info->start_stack = bprm->p; |
1071 |
|
1072 |
/* Calling set_brk effectively mmaps the pages that we need for the bss and break
|
1073 |
sections */
|
1074 |
set_brk(elf_bss, elf_brk); |
1075 |
|
1076 |
padzero(elf_bss); |
1077 |
|
1078 |
#if 0
|
1079 |
printf("(start_brk) %x\n" , info->start_brk);
|
1080 |
printf("(end_code) %x\n" , info->end_code);
|
1081 |
printf("(start_code) %x\n" , info->start_code);
|
1082 |
printf("(end_data) %x\n" , info->end_data);
|
1083 |
printf("(start_stack) %x\n" , info->start_stack);
|
1084 |
printf("(brk) %x\n" , info->brk);
|
1085 |
#endif
|
1086 |
|
1087 |
if ( info->personality == PER_SVR4 )
|
1088 |
{ |
1089 |
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
|
1090 |
and some applications "depend" upon this behavior.
|
1091 |
Since we do not have the power to recompile these, we
|
1092 |
emulate the SVr4 behavior. Sigh. */
|
1093 |
mapped_addr = target_mmap(0, host_page_size, PROT_READ | PROT_EXEC,
|
1094 |
MAP_FIXED | MAP_PRIVATE, -1, 0); |
1095 |
} |
1096 |
|
1097 |
#ifdef ELF_PLAT_INIT
|
1098 |
/*
|
1099 |
* The ABI may specify that certain registers be set up in special
|
1100 |
* ways (on i386 %edx is the address of a DT_FINI function, for
|
1101 |
* example. This macro performs whatever initialization to
|
1102 |
* the regs structure is required.
|
1103 |
*/
|
1104 |
ELF_PLAT_INIT(regs); |
1105 |
#endif
|
1106 |
|
1107 |
|
1108 |
info->entry = elf_entry; |
1109 |
|
1110 |
return 0; |
1111 |
} |
1112 |
|
1113 |
|
1114 |
|
1115 |
int elf_exec(const char * filename, char ** argv, char ** envp, |
1116 |
struct target_pt_regs * regs, struct image_info *infop) |
1117 |
{ |
1118 |
struct linux_binprm bprm;
|
1119 |
int retval;
|
1120 |
int i;
|
1121 |
|
1122 |
bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); |
1123 |
for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */ |
1124 |
bprm.page[i] = 0;
|
1125 |
retval = open(filename, O_RDONLY); |
1126 |
if (retval == -1) { |
1127 |
perror(filename); |
1128 |
exit(-1);
|
1129 |
/* return retval; */
|
1130 |
} |
1131 |
else {
|
1132 |
bprm.fd = retval; |
1133 |
} |
1134 |
bprm.filename = (char *)filename;
|
1135 |
bprm.sh_bang = 0;
|
1136 |
bprm.loader = 0;
|
1137 |
bprm.exec = 0;
|
1138 |
bprm.dont_iput = 0;
|
1139 |
bprm.argc = count(argv); |
1140 |
bprm.envc = count(envp); |
1141 |
|
1142 |
retval = prepare_binprm(&bprm); |
1143 |
|
1144 |
if(retval>=0) { |
1145 |
bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p);
|
1146 |
bprm.exec = bprm.p; |
1147 |
bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p); |
1148 |
bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p); |
1149 |
if (!bprm.p) {
|
1150 |
retval = -E2BIG; |
1151 |
} |
1152 |
} |
1153 |
|
1154 |
if(retval>=0) { |
1155 |
retval = load_elf_binary(&bprm,regs,infop); |
1156 |
} |
1157 |
if(retval>=0) { |
1158 |
/* success. Initialize important registers */
|
1159 |
regs->esp = infop->start_stack; |
1160 |
regs->eip = infop->entry; |
1161 |
return retval;
|
1162 |
} |
1163 |
|
1164 |
/* Something went wrong, return the inode and free the argument pages*/
|
1165 |
for (i=0 ; i<MAX_ARG_PAGES ; i++) { |
1166 |
free_page((void *)bprm.page[i]);
|
1167 |
} |
1168 |
return(retval);
|
1169 |
} |
1170 |
|
1171 |
|
1172 |
static int load_aout_interp(void * exptr, int interp_fd) |
1173 |
{ |
1174 |
printf("a.out interpreter not yet supported\n");
|
1175 |
return(0); |
1176 |
} |
1177 |
|