diff options
Diffstat (limited to 'src/linux-user/linuxload.c')
| -rw-r--r-- | src/linux-user/linuxload.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/linux-user/linuxload.c b/src/linux-user/linuxload.c new file mode 100644 index 0000000..dbaf0ec --- /dev/null +++ b/src/linux-user/linuxload.c @@ -0,0 +1,173 @@ +/* Code for loading Linux executables. Mostly linux kernel code. */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> + +#include "qemu.h" + +#define NGROUPS 32 + +/* ??? This should really be somewhere else. */ +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) + return -TARGET_EFAULT; + memcpy(host_ptr, src, len); + unlock_user(host_ptr, dest, 1); + return 0; +} + +static int count(char ** vec) +{ + int i; + + for(i = 0; *vec; i++) { + vec++; + } + + return(i); +} + +static int prepare_binprm(struct linux_binprm *bprm) +{ + struct stat st; + int mode; + int retval; + + if(fstat(bprm->fd, &st) < 0) { + return(-errno); + } + + mode = st.st_mode; + if(!S_ISREG(mode)) { /* Must be regular file */ + 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) { + bprm->e_uid = st.st_uid; + } + + /* Set-gid? */ + /* + * If setgid is set but no group execute bit then this + * is a candidate for mandatory locking, not a setgid + * executable. + */ + if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { + bprm->e_gid = st.st_gid; + } + + retval = read(bprm->fd, bprm->buf, BPRM_BUF_SIZE); + if (retval < 0) { + perror("prepare_binprm"); + exit(-1); + } + if (retval < BPRM_BUF_SIZE) { + /* Make sure the rest of the loader won't read garbage. */ + memset(bprm->buf + retval, 0, BPRM_BUF_SIZE - retval); + } + return retval; +} + +/* Construct the envp and argv tables on the target stack. */ +abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, + abi_ulong stringp, int push_ptr) +{ + TaskState *ts = (TaskState *)thread_cpu->opaque; + int n = sizeof(abi_ulong); + abi_ulong envp; + abi_ulong argv; + + sp -= (envc + 1) * n; + envp = sp; + sp -= (argc + 1) * n; + argv = sp; + if (push_ptr) { + /* FIXME - handle put_user() failures */ + sp -= n; + put_user_ual(envp, 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; + 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); + while (envc-- > 0) { + /* FIXME - handle put_user() failures */ + put_user_ual(stringp, envp); + envp += n; + stringp += target_strlen(stringp) + 1; + } + /* FIXME - handle put_user() failures */ + put_user_ual(0, envp); + + return 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) +{ + int retval; + + bprm->fd = fdexec; + bprm->filename = (char *)filename; + bprm->argc = count(argv); + bprm->argv = argv; + bprm->envc = count(envp); + bprm->envp = 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 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); +#endif + } else { + return -ENOEXEC; + } + } + + if(retval>=0) { + /* success. Initialize important registers */ + do_init_thread(regs, infop); + return retval; + } + + return(retval); +} |
