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authorJustus Winter <4winter@informatik.uni-hamburg.de>2013-06-29 20:59:41 +0200
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2013-06-29 21:00:15 +0200
commit18affff4633752370895e39e23a2c7e0f30bfc02 (patch)
tree7ff1ad515ab1d6280107eaaa46885ef1e9b3ed46 /sutils/clookup.c
parent7f52121e6510a8ca3424089b53844776a2ae01d7 (diff)
sutils: fix file_name_lookup_carefully
file_name_lookup_carefully is like file_name_lookup but tries hard to avoid starting any passive translators while doing the lookup. The callback contains code to get a new handle to the root if it encounters a translator, but this code was not being executed if the node had no record of an passive translator, just an active one. Fix the callback by dropping the test for a passive translator. AIUI the current check for a passive translator makes no sense, as the code is supposed to fail on encountering a passive translator. This fixes lookups inside translators that have no passive translator. For example if /run is a tmpfs started only as active translator, touch /run/lock && mount tmpfs -t tmpfs /run/lock -o size=5M would fail. * sutils/clookup.c (lookup): Drop the test for an passive translator.
Diffstat (limited to 'sutils/clookup.c')
-rw-r--r--sutils/clookup.c50
1 files changed, 18 insertions, 32 deletions
diff --git a/sutils/clookup.c b/sutils/clookup.c
index 0107799c..0232b634 100644
--- a/sutils/clookup.c
+++ b/sutils/clookup.c
@@ -83,43 +83,29 @@ file_name_lookup_carefully (const char *name, int flags, mode_t mode)
is), we have to simulate the above lookup being done without
O_NOTRANS. Do this being careful not to start any translators. */
{
- char _ptrans[1024], *ptrans = _ptrans;
- size_t ptrans_len = sizeof _ptrans;
+ /* See if there's an active translator. */
+ fsys_t fsys; /* Active translator control port. */
- err = file_get_translator (*node, &ptrans, &ptrans_len);
+ err = file_get_translator_cntl (*node, &fsys);
if (! err)
- /* Has a passive translator, see if there's an active one too. */
+ /* There is! Get its root node to use as the actual file. */
{
- fsys_t fsys; /* Active translator control port. */
-
- if (ptrans != _ptrans)
- /* Deallocate out-of-line memory from file_get_translator. */
- munmap (ptrans, ptrans_len);
-
- err = file_get_translator_cntl (*node, &fsys);
+ file_t unauth_dir; /* DIR unauthenticated. */
+ err = io_restrict_auth (dir, &unauth_dir, 0, 0, 0, 0);
if (! err)
- /* There is! Get its root node to use as the actual file. */
- {
- file_t unauth_dir; /* DIR unauthenticated. */
- err = io_restrict_auth (dir, &unauth_dir, 0, 0, 0, 0);
- if (! err)
- {
- file_t old_node = *node;
- err = fsys_getroot (fsys,
- unauth_dir, MACH_MSG_TYPE_COPY_SEND,
- uids, num_uids, gids, num_gids,
- flags & ~O_NOTRANS, retry,
- retry_name, node);
- mach_port_deallocate (mach_task_self (), unauth_dir);
- if (! err)
- mach_port_deallocate (mach_task_self (), old_node);
- }
- mach_port_deallocate (mach_task_self (), fsys);
- }
+ {
+ file_t old_node = *node;
+ err = fsys_getroot (fsys,
+ unauth_dir, MACH_MSG_TYPE_COPY_SEND,
+ uids, num_uids, gids, num_gids,
+ flags & ~O_NOTRANS, retry,
+ retry_name, node);
+ mach_port_deallocate (mach_task_self (), unauth_dir);
+ if (! err)
+ mach_port_deallocate (mach_task_self (), old_node);
+ }
+ mach_port_deallocate (mach_task_self (), fsys);
}
- else if (err == EINVAL)
- /* No passive translator. */
- err = 0;
if (!err && tail)
/* Append TAIL to RETRY_NAME. */