diff options
Diffstat (limited to 'linux-user/linuxload.c')
| -rw-r--r-- | linux-user/linuxload.c | 183 |
1 files changed, 140 insertions, 43 deletions
diff --git a/linux-user/linuxload.c b/linux-user/linuxload.c index a27e1d0d8b..37f132be4a 100644 --- a/linux-user/linuxload.c +++ b/linux-user/linuxload.c @@ -1,59 +1,61 @@ /* Code for loading Linux executables. Mostly linux kernel code. */ #include "qemu/osdep.h" - #include "qemu.h" +#include "user-internals.h" +#include "user-mmap.h" +#include "loader.h" +#include "qapi/error.h" #define NGROUPS 32 /* ??? This should really be somewhere else. */ -abi_long memcpy_to_target(abi_ulong dest, const void *src, - unsigned long len) +abi_long memcpy_to_target(abi_ulong dest, const void *src, unsigned long len) { void *host_ptr; host_ptr = lock_user(VERIFY_WRITE, dest, len, 0); - if (!host_ptr) + if (!host_ptr) { return -TARGET_EFAULT; + } memcpy(host_ptr, src, len); unlock_user(host_ptr, dest, 1); return 0; } -static int count(char ** vec) +static int count(char **vec) { - int i; + int i; - for(i = 0; *vec; i++) { + for (i = 0; *vec; i++) { vec++; } - - return(i); + return i; } static int prepare_binprm(struct linux_binprm *bprm) { - struct stat st; + struct stat st; int mode; int retval; - if(fstat(bprm->fd, &st) < 0) { - return(-errno); + if (fstat(bprm->src.fd, &st) < 0) { + return -errno; } mode = st.st_mode; - if(!S_ISREG(mode)) { /* Must be regular file */ - return(-EACCES); + if (!S_ISREG(mode)) { /* Must be regular file */ + return -EACCES; } - if(!(mode & 0111)) { /* Must have at least one execute bit set */ - return(-EACCES); + if (!(mode & 0111)) { /* Must have at least one execute bit set */ + return -EACCES; } bprm->e_uid = geteuid(); bprm->e_gid = getegid(); /* Set-uid? */ - if(mode & S_ISUID) { + if (mode & S_ISUID) { bprm->e_uid = st.st_uid; } @@ -67,7 +69,7 @@ static int prepare_binprm(struct linux_binprm *bprm) bprm->e_gid = st.st_gid; } - retval = read(bprm->fd, bprm->buf, BPRM_BUF_SIZE); + retval = read(bprm->src.fd, bprm->buf, BPRM_BUF_SIZE); if (retval < 0) { perror("prepare_binprm"); exit(-1); @@ -76,6 +78,10 @@ static int prepare_binprm(struct linux_binprm *bprm) /* Make sure the rest of the loader won't read garbage. */ memset(bprm->buf + retval, 0, BPRM_BUF_SIZE - retval); } + + bprm->src.cache = bprm->buf; + bprm->src.cache_size = retval; + return retval; } @@ -83,7 +89,7 @@ static int prepare_binprm(struct linux_binprm *bprm) abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, abi_ulong stringp, int push_ptr) { - TaskState *ts = (TaskState *)thread_cpu->opaque; + TaskState *ts = get_task_state(thread_cpu); int n = sizeof(abi_ulong); abi_ulong envp; abi_ulong argv; @@ -92,6 +98,11 @@ abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, envp = sp; sp -= (argc + 1) * n; argv = sp; + ts->info->envp = envp; + ts->info->envc = envc; + ts->info->argv = argv; + ts->info->argc = argc; + if (push_ptr) { /* FIXME - handle put_user() failures */ sp -= n; @@ -99,19 +110,22 @@ abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, sp -= n; put_user_ual(argv, sp); } + sp -= n; /* FIXME - handle put_user() failures */ put_user_ual(argc, sp); - ts->info->arg_start = stringp; + + ts->info->arg_strings = stringp; while (argc-- > 0) { /* FIXME - handle put_user() failures */ put_user_ual(stringp, argv); argv += n; stringp += target_strlen(stringp) + 1; } - ts->info->arg_end = stringp; /* FIXME - handle put_user() failures */ put_user_ual(0, argv); + + ts->info->env_strings = stringp; while (envc-- > 0) { /* FIXME - handle put_user() failures */ put_user_ual(stringp, envp); @@ -125,12 +139,12 @@ abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, } int loader_exec(int fdexec, const char *filename, char **argv, char **envp, - struct target_pt_regs * regs, struct image_info *infop, - struct linux_binprm *bprm) + struct target_pt_regs *regs, struct image_info *infop, + struct linux_binprm *bprm) { int retval; - bprm->fd = fdexec; + bprm->src.fd = fdexec; bprm->filename = (char *)filename; bprm->argc = count(argv); bprm->argv = argv; @@ -139,29 +153,112 @@ int loader_exec(int fdexec, const char *filename, char **argv, char **envp, retval = prepare_binprm(bprm); - if(retval>=0) { - if (bprm->buf[0] == 0x7f - && bprm->buf[1] == 'E' - && bprm->buf[2] == 'L' - && bprm->buf[3] == 'F') { - retval = load_elf_binary(bprm, infop); + if (retval < 4) { + return -ENOEXEC; + } + if (bprm->buf[0] == 0x7f + && bprm->buf[1] == 'E' + && bprm->buf[2] == 'L' + && bprm->buf[3] == 'F') { + retval = load_elf_binary(bprm, infop); #if defined(TARGET_HAS_BFLT) - } else if (bprm->buf[0] == 'b' - && bprm->buf[1] == 'F' - && bprm->buf[2] == 'L' - && bprm->buf[3] == 'T') { - retval = load_flt_binary(bprm, infop); + } else if (bprm->buf[0] == 'b' + && bprm->buf[1] == 'F' + && bprm->buf[2] == 'L' + && bprm->buf[3] == 'T') { + retval = load_flt_binary(bprm, infop); #endif - } else { - return -ENOEXEC; - } + } else { + return -ENOEXEC; } - - if(retval>=0) { - /* success. Initialize important registers */ - do_init_thread(regs, infop); + if (retval < 0) { return retval; } - return(retval); + /* Success. Initialize important registers. */ + do_init_thread(regs, infop); + return 0; +} + +bool imgsrc_read(void *dst, off_t offset, size_t len, + const ImageSource *img, Error **errp) +{ + ssize_t ret; + + if (offset + len <= img->cache_size) { + memcpy(dst, img->cache + offset, len); + return true; + } + + if (img->fd < 0) { + error_setg(errp, "read past end of buffer"); + return false; + } + + ret = pread(img->fd, dst, len, offset); + if (ret == len) { + return true; + } + if (ret < 0) { + error_setg_errno(errp, errno, "Error reading file header"); + } else { + error_setg(errp, "Incomplete read of file header"); + } + return false; +} + +void *imgsrc_read_alloc(off_t offset, size_t len, + const ImageSource *img, Error **errp) +{ + void *alloc = g_malloc(len); + bool ok = imgsrc_read(alloc, offset, len, img, errp); + + if (!ok) { + g_free(alloc); + alloc = NULL; + } + return alloc; +} + +abi_long imgsrc_mmap(abi_ulong start, abi_ulong len, int prot, + int flags, const ImageSource *src, abi_ulong offset) +{ + const int prot_write = PROT_READ | PROT_WRITE; + abi_long ret; + void *haddr; + + assert(flags == (MAP_PRIVATE | MAP_FIXED)); + + if (src->fd >= 0) { + return target_mmap(start, len, prot, flags, src->fd, offset); + } + + /* + * This case is for the vdso; we don't expect bad images. + * The mmap may extend beyond the end of the image, especially + * to the end of the page. Zero fill. + */ + assert(offset < src->cache_size); + + ret = target_mmap(start, len, prot_write, flags | MAP_ANON, -1, 0); + if (ret == -1) { + return ret; + } + + haddr = lock_user(VERIFY_WRITE, start, len, 0); + assert(haddr != NULL); + if (offset + len <= src->cache_size) { + memcpy(haddr, src->cache + offset, len); + } else { + size_t rest = src->cache_size - offset; + memcpy(haddr, src->cache + offset, rest); + memset(haddr + rest, 0, len - rest); + } + unlock_user(haddr, start, len); + + if (prot != prot_write) { + target_mprotect(start, len, prot); + } + + return ret; } |