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fix: proot fast path hands opendir of a directory symlink to proot (#454)

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Kurt Himebauch authored and GitHub committed 2026-10-09 07:11:09 -04:00
1 parent 7c758c817f
commit 416c1b9efd
1 file changed
+6
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tools/proot/fastpath/fastpath.c
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@@ -391,6 +391,12 @@ static long fp_open(int dirfd, const char *path, int flags, mode_t mode) {
/* The last component is never followed here: a symlink there is proot's to resolve. */
long fd = sc(SYS_openat, AT_FDCWD, (long)host, flags | O_NOFOLLOW, (flags & O_CREAT) ? mode : 0, 0);
if (fd == -ELOOP && !(flags & O_NOFOLLOW)) return FP_SLOW;
/* With O_DIRECTORY the kernel checks for a directory before it gets to the symlink, so a link to
* a directory (opendir() of it) fails ENOTDIR rather than ELOOP. A real non-directory stays here. */
if (fd == -ENOTDIR && (flags & O_DIRECTORY) && !(flags & O_NOFOLLOW)) {
struct stat st;
if (kind(host, &st) == 1) return FP_SLOW;
}
if (fd >= 0 && (flags & O_PATH) && !(flags & O_NOFOLLOW)) {
struct stat st;
if (sc(SYS_fstat, fd, (long)&st, 0, 0, 0) != 0 || S_ISLNK(st.st_mode)) {