| 1 | #include <unistd.h> |
| 2 | #include <fcntl.h> |
| 3 | #include <errno(*__errno_location()).h> |
| 4 | #include <sys/wait.h> |
| 5 | #include "syscall.h" |
| 6 | #include "pthread_impl.h" |
| 7 | |
| 8 | struct ctx { |
| 9 | int fd; |
| 10 | const char *filename; |
| 11 | int amode; |
| 12 | }; |
| 13 | |
| 14 | static const int errors[] = { |
| 15 | 0, -EACCES13, -ELOOP40, -ENAMETOOLONG36, -ENOENT2, -ENOTDIR20, |
| 16 | -EROFS30, -EBADF9, -EINVAL22, -ETXTBSY26, |
| 17 | -EFAULT14, -EIO5, -ENOMEM12, |
| 18 | -EBUSY16 |
| 19 | }; |
| 20 | |
| 21 | static int checker(void *p) |
| 22 | { |
| 23 | struct ctx *c = p; |
| 24 | int ret; |
| 25 | int i; |
| 26 | if (__syscall(SYS_setregid, __syscall(SYS_getegid), -1)__syscall2(204,((long) (__syscall0(202))),((long) (-1))) |
| 27 | || __syscall(SYS_setreuid, __syscall(SYS_geteuid), -1)__syscall2(203,((long) (__syscall0(201))),((long) (-1)))) |
| 28 | __syscall(SYS_exit, 1)__syscall1(1,((long) (1))); |
| 29 | ret = __syscall(SYS_faccessat, c->fd, c->filename, c->amode, 0)__syscall4(334,((long) (c->fd)),((long) (c->filename)),
((long) (c->amode)),((long) (0))); |
| 30 | for (i=0; i < sizeof errors/sizeof *errors - 1 && ret!=errors[i]; i++); |
| 31 | return i; |
| 32 | } |
| 33 | |
| 34 | int faccessat(int fd, const char *filename, int amode, int flag) |
| 35 | { |
| 36 | if (!flag || (flag==AT_EACCESS0x200 && getuid()==geteuid() && getgid()==getegid())) |
| 1 | Assuming 'flag' is not equal to 0 | |
|
| 2 | | Assuming 'flag' is equal to 512 | |
|
| 37 | return syscall(SYS_faccessat, fd, filename, amode, flag)__syscall_ret(__syscall4(334,((long) (fd)),((long) (filename)
),((long) (amode)),((long) (flag)))); |
| 38 | |
| 39 | if (flag != AT_EACCESS0x200) |
| |
| 40 | return __syscall_ret(-EINVAL22); |
| 41 | |
| 42 | char stack[1024]; |
| 43 | sigset_t set; |
| 44 | pid_t pid; |
| 45 | int ret = -EBUSY16; |
| 46 | struct ctx c = { .fd = fd, .filename = filename, .amode = amode }; |
| 47 | |
| 48 | __block_all_sigs(&set); |
| 49 | |
| 50 | pid = __clone(checker, stack+sizeof stack, 0, &c); |
| 51 | if (pid > 0) { |
| |
| |
| 52 | int status; |
| 6 | | 'status' declared without an initial value | |
|
| 53 | do { |
| 54 | __syscall(SYS_wait4, pid, &status, __WCLONE, 0)__syscall4(114,((long) (pid)),((long) (&status)),((long) (
0x80000000)),((long) (0))); |
| 55 | } while (!WIFEXITED(status)(!((status) & 0x7f)) && !WIFSIGNALED(status)(((status)&0xffff)-1U < 0xffu)); |
| 7 | | Within the expansion of the macro 'WIFEXITED':
|
a | The left operand of '&' is a garbage value |
|
| 56 | if (WIFEXITED(status)(!((status) & 0x7f))) |
| 57 | ret = errors[WEXITSTATUS(status)(((status) & 0xff00) >> 8)]; |
| 58 | } |
| 59 | |
| 60 | __restore_sigs(&set); |
| 61 | |
| 62 | return __syscall_ret(ret); |
| 63 | } |