Subject: + ipcshm-correct-error-return-value-in-shmctl-shm_unlock.patch added
to -mm tree
To:
[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
From: [email protected]
Date: Wed, 20 Nov 2013 14:45:48 -0800
The patch titled
Subject: ipc,shm: correct error return value in shmctl (SHM_UNLOCK)
has been added to the -mm tree. Its filename is
ipcshm-correct-error-return-value-in-shmctl-shm_unlock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ipcshm-correct-error-return-value-in-shmctl-shm_unlock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ipcshm-correct-error-return-value-in-shmctl-shm_unlock.patch
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------------------------------------------------------
From: Jesper Nilsson <[email protected]>
Subject: ipc,shm: correct error return value in shmctl (SHM_UNLOCK)
2caacaa82a51b78 ("ipc,shm: shorten critical region for shmctl")
restructured the ipc shm to shorten critical region, but introduced a path
where the return value could be -EPERM, even if the operation actually was
performed.
Before the commit, the err return value was reset by the return value from
security_shm_shmctl() after the if (!ns_capable(...)) statement.
Now, we still exit the if statement with err set to -EPERM, and in the
case of SHM_UNLOCK, it is not reset at all, and used as the return value
from shmctl.
To fix this, we only set err when errors occur, leaving the fallthrough
case alone.
Signed-off-by: Jesper Nilsson <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Michel Lespinasse <[email protected]>
Cc: Al Viro <[email protected]>
Cc: <[email protected]> [3.12.x]
Signed-off-by: Andrew Morton <[email protected]>
---
ipc/shm.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff -puN ipc/shm.c~ipcshm-correct-error-return-value-in-shmctl-shm_unlock
ipc/shm.c
--- a/ipc/shm.c~ipcshm-correct-error-return-value-in-shmctl-shm_unlock
+++ a/ipc/shm.c
@@ -977,12 +977,15 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int,
ipc_lock_object(&shp->shm_perm);
if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
kuid_t euid = current_euid();
- err = -EPERM;
if (!uid_eq(euid, shp->shm_perm.uid) &&
- !uid_eq(euid, shp->shm_perm.cuid))
+ !uid_eq(euid, shp->shm_perm.cuid)) {
+ err = -EPERM;
goto out_unlock0;
- if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
+ }
+ if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) {
+ err = -EPERM;
goto out_unlock0;
+ }
}
shm_file = shp->shm_file;
_
Patches currently in -mm which might be from [email protected] are
origin.patch
ipcshm-correct-error-return-value-in-shmctl-shm_unlock.patch
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