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ipc,sysv: return -EINVAL upon incorrect id/seqnum

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In ipc_obtain_object_check we return -EIDRM when a bogus sequence number
is detected via ipc_checkid, while the ipc manpages state the following
return codes for such errors:

   EIDRM  <ID> points to a removed identifier.
   EINVAL Invalid <ID> value, or unaligned, etc.

EIDRM should only be returned upon a RMID call (->deleted check), and thus
return EINVAL for wrong seq.  This difference in semantics has also caused
real bugs, ie: https://bugzilla.redhat.com/show_bug.cgi?id=246509

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso 2015-06-30 14:58:48 -07:00 committed by Linus Torvalds
parent f8b5918495
commit 6157dbbfbf
1 changed files with 1 additions and 1 deletions
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2
ipc/util.c
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@ -622,7 +622,7 @@ struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id)
goto out; goto out;
if (ipc_checkid(out, id)) if (ipc_checkid(out, id))
return ERR_PTR(-EIDRM); return ERR_PTR(-EINVAL);
out: out:
return out; return out;
} }