diff options
Diffstat (limited to 'linux-user/syscall.c')
| -rw-r--r-- | linux-user/syscall.c | 303 |
1 files changed, 281 insertions, 22 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 2bf9e7ec44..ee8899ef3d 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -731,6 +731,9 @@ static inline int is_error(abi_long ret) char *target_strerror(int err) { + if ((err >= ERRNO_TABLE_SIZE) || (err < 0)) { + return NULL; + } return strerror(target_to_host_errno(err)); } @@ -1530,9 +1533,41 @@ static abi_long do_getsockopt(int sockfd, int level, int optname, case TARGET_SO_LINGER: case TARGET_SO_RCVTIMEO: case TARGET_SO_SNDTIMEO: - case TARGET_SO_PEERCRED: case TARGET_SO_PEERNAME: goto unimplemented; + case TARGET_SO_PEERCRED: { + struct ucred cr; + socklen_t crlen; + struct target_ucred *tcr; + + if (get_user_u32(len, optlen)) { + return -TARGET_EFAULT; + } + if (len < 0) { + return -TARGET_EINVAL; + } + + crlen = sizeof(cr); + ret = get_errno(getsockopt(sockfd, level, SO_PEERCRED, + &cr, &crlen)); + if (ret < 0) { + return ret; + } + if (len > crlen) { + len = crlen; + } + if (!lock_user_struct(VERIFY_WRITE, tcr, optval_addr, 0)) { + return -TARGET_EFAULT; + } + __put_user(cr.pid, &tcr->pid); + __put_user(cr.uid, &tcr->uid); + __put_user(cr.gid, &tcr->gid); + unlock_user_struct(tcr, optval_addr, 1); + if (put_user_u32(len, optlen)) { + return -TARGET_EFAULT; + } + break; + } /* Options with 'int' argument. */ case TARGET_SO_DEBUG: optname = SO_DEBUG; @@ -4600,6 +4635,123 @@ int get_osversion(void) return osversion; } + +static int open_self_maps(void *cpu_env, int fd) +{ + TaskState *ts = ((CPUState *)cpu_env)->opaque; + + dprintf(fd, "%08llx-%08llx rw-p %08llx 00:00 0 [stack]\n", + (unsigned long long)ts->info->stack_limit, + (unsigned long long)(ts->stack_base + (TARGET_PAGE_SIZE - 1)) + & TARGET_PAGE_MASK, + (unsigned long long)ts->stack_base); + + return 0; +} + +static int open_self_stat(void *cpu_env, int fd) +{ + TaskState *ts = ((CPUState *)cpu_env)->opaque; + abi_ulong start_stack = ts->info->start_stack; + int i; + + for (i = 0; i < 44; i++) { + char buf[128]; + int len; + uint64_t val = 0; + + if (i == 27) { + /* stack bottom */ + val = start_stack; + } + snprintf(buf, sizeof(buf), "%"PRId64 "%c", val, i == 43 ? '\n' : ' '); + len = strlen(buf); + if (write(fd, buf, len) != len) { + return -1; + } + } + + return 0; +} + +static int open_self_auxv(void *cpu_env, int fd) +{ + TaskState *ts = ((CPUState *)cpu_env)->opaque; + abi_ulong auxv = ts->info->saved_auxv; + abi_ulong len = ts->info->auxv_len; + char *ptr; + + /* + * Auxiliary vector is stored in target process stack. + * read in whole auxv vector and copy it to file + */ + ptr = lock_user(VERIFY_READ, auxv, len, 0); + if (ptr != NULL) { + while (len > 0) { + ssize_t r; + r = write(fd, ptr, len); + if (r <= 0) { + break; + } + len -= r; + ptr += r; + } + lseek(fd, 0, SEEK_SET); + unlock_user(ptr, auxv, len); + } + + return 0; +} + +static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode) +{ + struct fake_open { + const char *filename; + int (*fill)(void *cpu_env, int fd); + }; + const struct fake_open *fake_open; + static const struct fake_open fakes[] = { + { "/proc/self/maps", open_self_maps }, + { "/proc/self/stat", open_self_stat }, + { "/proc/self/auxv", open_self_auxv }, + { NULL, NULL } + }; + + for (fake_open = fakes; fake_open->filename; fake_open++) { + if (!strncmp(pathname, fake_open->filename, + strlen(fake_open->filename))) { + break; + } + } + + if (fake_open->filename) { + const char *tmpdir; + char filename[PATH_MAX]; + int fd, r; + + /* create temporary file to map stat to */ + tmpdir = getenv("TMPDIR"); + if (!tmpdir) + tmpdir = "/tmp"; + snprintf(filename, sizeof(filename), "%s/qemu-open.XXXXXX", tmpdir); + fd = mkstemp(filename); + if (fd < 0) { + return fd; + } + unlink(filename); + + if ((r = fake_open->fill(cpu_env, fd))) { + close(fd); + return r; + } + lseek(fd, 0, SEEK_SET); + + return fd; + } + + return get_errno(open(path(pathname), flags, mode)); +} + /* do_syscall() should always have a single exit point at the end so that actions, such as logging of syscall results, can be performed. All errnos that do_syscall() returns must be -TARGET_<errcode>. */ @@ -4685,9 +4837,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, case TARGET_NR_open: if (!(p = lock_user_string(arg1))) goto efault; - ret = get_errno(open(path(p), - target_to_host_bitmask(arg2, fcntl_flags_tbl), - arg3)); + ret = get_errno(do_open(cpu_env, p, + target_to_host_bitmask(arg2, fcntl_flags_tbl), + arg3)); unlock_user(p, arg1, 0); break; #if defined(TARGET_NR_openat) && defined(__NR_openat) @@ -4715,7 +4867,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, { int status; ret = get_errno(waitpid(arg1, &status, arg3)); - if (!is_error(ret) && arg2 + if (!is_error(ret) && arg2 && ret && put_user_s32(host_to_target_waitstatus(status), arg2)) goto efault; } @@ -6271,7 +6423,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, rusage_ptr = NULL; ret = get_errno(wait4(arg1, &status, arg3, rusage_ptr)); if (!is_error(ret)) { - if (status_ptr) { + if (status_ptr && ret) { status = host_to_target_waitstatus(status); if (put_user_s32(status, status_ptr)) goto efault; @@ -7644,25 +7796,64 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, #endif #ifdef CONFIG_ATTR #ifdef TARGET_NR_setxattr - case TARGET_NR_lsetxattr: - case TARGET_NR_fsetxattr: - case TARGET_NR_lgetxattr: - case TARGET_NR_fgetxattr: case TARGET_NR_listxattr: case TARGET_NR_llistxattr: + { + void *p, *b = 0; + if (arg2) { + b = lock_user(VERIFY_WRITE, arg2, arg3, 0); + if (!b) { + ret = -TARGET_EFAULT; + break; + } + } + p = lock_user_string(arg1); + if (p) { + if (num == TARGET_NR_listxattr) { + ret = get_errno(listxattr(p, b, arg3)); + } else { + ret = get_errno(llistxattr(p, b, arg3)); + } + } else { + ret = -TARGET_EFAULT; + } + unlock_user(p, arg1, 0); + unlock_user(b, arg2, arg3); + break; + } case TARGET_NR_flistxattr: - case TARGET_NR_lremovexattr: - case TARGET_NR_fremovexattr: - ret = -TARGET_EOPNOTSUPP; + { + void *b = 0; + if (arg2) { + b = lock_user(VERIFY_WRITE, arg2, arg3, 0); + if (!b) { + ret = -TARGET_EFAULT; + break; + } + } + ret = get_errno(flistxattr(arg1, b, arg3)); + unlock_user(b, arg2, arg3); break; + } case TARGET_NR_setxattr: + case TARGET_NR_lsetxattr: { - void *p, *n, *v; + void *p, *n, *v = 0; + if (arg3) { + v = lock_user(VERIFY_READ, arg3, arg4, 1); + if (!v) { + ret = -TARGET_EFAULT; + break; + } + } p = lock_user_string(arg1); n = lock_user_string(arg2); - v = lock_user(VERIFY_READ, arg3, arg4, 1); - if (p && n && v) { - ret = get_errno(setxattr(p, n, v, arg4, arg5)); + if (p && n) { + if (num == TARGET_NR_setxattr) { + ret = get_errno(setxattr(p, n, v, arg4, arg5)); + } else { + ret = get_errno(lsetxattr(p, n, v, arg4, arg5)); + } } else { ret = -TARGET_EFAULT; } @@ -7671,14 +7862,45 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, unlock_user(v, arg3, 0); } break; + case TARGET_NR_fsetxattr: + { + void *n, *v = 0; + if (arg3) { + v = lock_user(VERIFY_READ, arg3, arg4, 1); + if (!v) { + ret = -TARGET_EFAULT; + break; + } + } + n = lock_user_string(arg2); + if (n) { + ret = get_errno(fsetxattr(arg1, n, v, arg4, arg5)); + } else { + ret = -TARGET_EFAULT; + } + unlock_user(n, arg2, 0); + unlock_user(v, arg3, 0); + } + break; case TARGET_NR_getxattr: + case TARGET_NR_lgetxattr: { - void *p, *n, *v; + void *p, *n, *v = 0; + if (arg3) { + v = lock_user(VERIFY_WRITE, arg3, arg4, 0); + if (!v) { + ret = -TARGET_EFAULT; + break; + } + } p = lock_user_string(arg1); n = lock_user_string(arg2); - v = lock_user(VERIFY_WRITE, arg3, arg4, 0); - if (p && n && v) { - ret = get_errno(getxattr(p, n, v, arg4)); + if (p && n) { + if (num == TARGET_NR_getxattr) { + ret = get_errno(getxattr(p, n, v, arg4)); + } else { + ret = get_errno(lgetxattr(p, n, v, arg4)); + } } else { ret = -TARGET_EFAULT; } @@ -7687,13 +7909,38 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, unlock_user(v, arg3, arg4); } break; + case TARGET_NR_fgetxattr: + { + void *n, *v = 0; + if (arg3) { + v = lock_user(VERIFY_WRITE, arg3, arg4, 0); + if (!v) { + ret = -TARGET_EFAULT; + break; + } + } + n = lock_user_string(arg2); + if (n) { + ret = get_errno(fgetxattr(arg1, n, v, arg4)); + } else { + ret = -TARGET_EFAULT; + } + unlock_user(n, arg2, 0); + unlock_user(v, arg3, arg4); + } + break; case TARGET_NR_removexattr: + case TARGET_NR_lremovexattr: { void *p, *n; p = lock_user_string(arg1); n = lock_user_string(arg2); if (p && n) { - ret = get_errno(removexattr(p, n)); + if (num == TARGET_NR_removexattr) { + ret = get_errno(removexattr(p, n)); + } else { + ret = get_errno(lremovexattr(p, n)); + } } else { ret = -TARGET_EFAULT; } @@ -7701,6 +7948,18 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, unlock_user(n, arg2, 0); } break; + case TARGET_NR_fremovexattr: + { + void *n; + n = lock_user_string(arg2); + if (n) { + ret = get_errno(fremovexattr(arg1, n)); + } else { + ret = -TARGET_EFAULT; + } + unlock_user(n, arg2, 0); + } + break; #endif #endif /* CONFIG_ATTR */ #ifdef TARGET_NR_set_thread_area |