Subject: + ipc-fix-compat-msgrcv-with-negative-msgtyp.patch added to -mm tree
To: mguzik@xxxxxxxxxx,davidlohr@xxxxxx,gsc@xxxxxxxxx,manfred@xxxxxxxxxxxxxxxx,viro@xxxxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 21 Jan 2014 11:24:00 -0800
The patch titled
Subject: ipc: fix compat msgrcv with negative msgtyp
has been added to the -mm tree. Its filename is
ipc-fix-compat-msgrcv-with-negative-msgtyp.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ipc-fix-compat-msgrcv-with-negative-msgtyp.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ipc-fix-compat-msgrcv-with-negative-msgtyp.patch
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------------------------------------------------------
From: Mateusz Guzik <mguzik@xxxxxxxxxx>
Subject: ipc: fix compat msgrcv with negative msgtyp
Compat function takes msgtyp argument as u32 and passes it down to
do_msgrcv which results in casting to long, thus the sign is lost and we
get a big positive number instead.
Cast the argument to signed type before passing it down.
Signed-off-by: Mateusz Guzik <mguzik@xxxxxxxxxx>
Reported-by: Gabriellla Schmidt <gsc@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Davidlohr Bueso <davidlohr@xxxxxx>
Cc: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/compat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN ipc/compat.c~ipc-fix-compat-msgrcv-with-negative-msgtyp ipc/compat.c
--- a/ipc/compat.c~ipc-fix-compat-msgrcv-with-negative-msgtyp
+++ a/ipc/compat.c
@@ -381,7 +381,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, i
uptr = compat_ptr(ipck.msgp);
fifth = ipck.msgtyp;
}
- return do_msgrcv(first, uptr, second, fifth, third,
+ return do_msgrcv(first, uptr, second, (s32)fifth, third,
compat_do_msg_fill);
}
case MSGGET:
_
Patches currently in -mm which might be from mguzik@xxxxxxxxxx are
ipc-fix-compat-msgrcv-with-negative-msgtyp.patch
linux-next.patch
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