On Mon, Aug 01, 2016 at 01:40:58PM +0200, Fabian Frederick wrote:
> Commit 53dad6d3a8e5
> ("ipc: fix race with LSMs") updated ipc_rcu_putref() to receive
> rcu freeing function but used generic ipc_rcu_free() instead
> of msg_rcu_free() which does security cleaning.
>
> Running LTP msgsnd06 with kmemleak gives the following:
>
> cat /sys/kernel/debug/kmemleak
>
> unreferenced object 0xffff88003c0a11f8 (size 8):
> comm "msgsnd06", pid 1645, jiffies 4294672526 (age 6.549s)
> hex dump (first 8 bytes):
> 1b 00 00 00 01 00 00 00 ........
> backtrace:
> [<ffffffff818e2c43>] kmemleak_alloc+0x23/0x40
> [<ffffffff81177f31>] kmem_cache_alloc_trace+0xe1/0x180
> [<ffffffff812d42af>] selinux_msg_queue_alloc_security+0x3f/0xd0
> [<ffffffff812cc6be>] security_msg_queue_alloc+0x2e/0x40
> [<ffffffff812b94ee>] newque+0x4e/0x150
> [<ffffffff812b8cb9>] ipcget+0x159/0x1b0
> [<ffffffff812b98d9>] SyS_msgget+0x39/0x40
> [<ffffffff818e7bdb>] entry_SYSCALL_64_fastpath+0x13/0x8f
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
> ---
> V2: Update description with original commit and cc stable
> (Suggested by Manfred Spraul)
>
> ipc/msg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read Documentation/stable_kernel_rules.txt
for how to do this properly.
</formletter>
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