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Make path_open return ELOOP on O_NOFOLLOW|O_DIRECTORY on a symlink. #118

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merged 1 commit into from
Apr 26, 2019
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Make path_open return ELOOP on O_NOFOLLOW|O_DIRECTORY on a symlink. #118

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17 changes: 14 additions & 3 deletions wasmtime-wasi/sandboxed-system-primitives/src/posix.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1763,21 +1763,32 @@ __wasi_errno_t wasmtime_ssp_path_open(

int nfd = openat(pa.fd, pa.path, noflags, 0666);
if (nfd < 0) {
int openat_errno = errno;
// Linux returns ENXIO instead of EOPNOTSUPP when opening a socket.
if (errno == ENXIO) {
if (openat_errno == ENXIO) {
struct stat sb;
int ret =
fstatat(pa.fd, pa.path, &sb, pa.follow ? 0 : AT_SYMLINK_NOFOLLOW);
path_put(&pa);
return ret == 0 && S_ISSOCK(sb.st_mode) ? __WASI_ENOTSUP
: __WASI_ENXIO;
}
// Linux returns ENOTDIR instead of ELOOP when using O_NOFOLLOW|O_DIRECTORY
// on a symlink.
if (openat_errno == ENOTDIR && (noflags & (O_NOFOLLOW | O_DIRECTORY)) != 0) {
struct stat sb;
int ret = fstatat(pa.fd, pa.path, &sb, AT_SYMLINK_NOFOLLOW);
if (S_ISLNK(sb.st_mode)) {
path_put(&pa);
return __WASI_ELOOP;
}
}
path_put(&pa);
// FreeBSD returns EMLINK instead of ELOOP when using O_NOFOLLOW on
// a symlink.
if (!pa.follow && errno == EMLINK)
if (!pa.follow && openat_errno == EMLINK)
return __WASI_ELOOP;
return convert_errno(errno);
return convert_errno(openat_errno);
}
path_put(&pa);

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