[hurd,commited,2/5] hurd: Fix O_DIRECTORY | O_NOFOLLOW
Commit Message
Appending / to the path to be looked up would make us always follow a final
symlink, even with O_NOTRANS (since the final resolution is after the
'/'). In the O_DIRECTORY | O_NOFOLLOW case, we thus have to really open
the node and stat it, which we already do anyway, and check for
directory type.
* hurd/hurdlookup.c (__hurd_file_name_lookup): Do not append '/' to
path when flags contains O_NOFOLLOW.
* hurd/lookup-retry.c (__hurd_file_name_lookup_retry): Return ENOTDIR
if flags contains O_DIRECTORY and the result is a directory.
---
ChangeLog | 4 ++++
hurd/hurdlookup.c | 2 +-
hurd/lookup-retry.c | 2 ++
3 files changed, 7 insertions(+), 1 deletion(-)
@@ -64,6 +64,10 @@
* sysdeps/mach/hurd/cthreads.c: Include <cthreads.h>.
* hurd/lookup-retry.c (__hurd_file_name_lookup_retry): Return ELOOP
when opening a symlink with O_NOFOLLOW.
+ * hurd/hurdlookup.c (__hurd_file_name_lookup): Do not append '/' to
+ path when flags contains O_NOFOLLOW.
+ * hurd/lookup-retry.c (__hurd_file_name_lookup_retry): Return ENOTDIR
+ if flags contains O_DIRECTORY and the result is a directory.
2018-03-17 Samuel Thibault <samuel.thibault@ens-lyon.org>
@@ -72,7 +72,7 @@ __hurd_file_name_lookup (error_t (*use_init_port)
if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */
flags |= O_NOTRANS;
- if (flags & O_DIRECTORY)
+ if (flags & O_DIRECTORY && (flags & O_NOFOLLOW) == 0)
{
/* The caller wants to require that the file we look up is a directory.
We can do this without an extra RPC by appending a trailing slash
@@ -147,6 +147,8 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
err = __io_stat (*result, &st);
if (!err)
{
+ if (flags & O_DIRECTORY && !S_ISDIR (st.st_mode))
+ err = ENOTDIR;
if (S_ISLNK (st.st_mode))
err = ELOOP;
else if (st.st_mode & (S_IPTRANS|S_IATRANS))