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use the correct stat structure in the fstat path 

commit 01ae3fc6d4 modified fstatat to
translate the kernel's struct stat ("kstat") into the libc struct stat.
To do this, it created a local kstat object, and copied its contents
into the user-provided object.

However, the commit neglected to update the fstat compatibility path and
its fallbacks. They continued to pass the user-supplied object to the
kernel, later overwiting it with the uninitialized memory in the local
temporary.
This commit is contained in:
Samuel Holland 2019-07-20 23:52:26 -05:00 committed by Rich Felker
parent e53a91da58
commit 0ce49d0a30
1 changed files with 4 additions and 4 deletions
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8
src/stat/fstatat.c
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@ -67,16 +67,16 @@ static int fstatat_kstat(int fd, const char *restrict path, struct stat *restric
struct kstat kst;
if (flag==AT_EMPTY_PATH && fd>=0 && !*path) {
ret = __syscall(SYS_fstat, fd, st);
ret = __syscall(SYS_fstat, fd, &kst);
if (ret==-EBADF && __syscall(SYS_fcntl, fd, F_GETFD)>=0) {
ret = __syscall(SYS_fstatat, fd, path, st, flag);
ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
if (ret==-EINVAL) {
char buf[15+3*sizeof(int)];
__procfdname(buf, fd);
#ifdef SYS_stat
ret = __syscall(SYS_stat, buf, st);
ret = __syscall(SYS_stat, buf, &kst);
#else
ret = __syscall(SYS_fstatat, AT_FDCWD, buf, st, 0);
ret = __syscall(SYS_fstatat, AT_FDCWD, buf, &kst, 0);
#endif
}
}