linux-kernel - Re: [PATCH 4.14, 4.9] crypto: talitos - fix Kernel Oops on hashing an empty file

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Message-ID: <AM0PR0402MB3329F7DB21610C75674BA7AD98CD0@AM0PR0402MB3329.eurprd04.prod.outlook.com>
Date:   Thu, 22 Feb 2018 08:30:56 +0000
From:   Horia Geantă <horia.geanta@....com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4.14, 4.9] crypto: talitos - fix Kernel Oops on hashing an
 empty file

On 2/22/2018 9:08 AM, Christophe Leroy wrote:
> Upstream 87a81dce53b1ea61acaeefa5191a0376a2d1d721
> 
> Performing the hash of an empty file leads to a kernel Oops
> 
> [   44.504600] Unable to handle kernel paging request for data at address 0x0000000c
> [   44.512819] Faulting instruction address: 0xc02d2be8
> [   44.524088] Oops: Kernel access of bad area, sig: 11 [#1]
> [   44.529171] BE PREEMPT CMPC885
> [   44.532232] CPU: 0 PID: 491 Comm: md5sum Not tainted 4.15.0-rc8-00211-g3a968610b6ea #81
> [   44.540814] NIP:  c02d2be8 LR: c02d2984 CTR: 00000000
> [   44.545812] REGS: c6813c90 TRAP: 0300   Not tainted  (4.15.0-rc8-00211-g3a968610b6ea)
> [   44.554223] MSR:  00009032 <EE,ME,IR,DR,RI>  CR: 48222822  XER: 20000000
> [   44.560855] DAR: 0000000c DSISR: c0000000
> [   44.560855] GPR00: c02d28fc c6813d40 c6828000 c646fa40 00000001 00000001 00000001 00000000
> [   44.560855] GPR08: 0000004c 00000000 c000bfcc 00000000 28222822 100280d4 00000000 10020008
> [   44.560855] GPR16: 00000000 00000020 00000000 00000000 10024008 00000000 c646f9f0 c6179a10
> [   44.560855] GPR24: 00000000 00000001 c62f0018 c6179a10 00000000 c6367a30 c62f0000 c646f9c0
> [   44.598542] NIP [c02d2be8] ahash_process_req+0x448/0x700
> [   44.603751] LR [c02d2984] ahash_process_req+0x1e4/0x700
> [   44.608868] Call Trace:
> [   44.611329] [c6813d40] [c02d28fc] ahash_process_req+0x15c/0x700 (unreliable)
> [   44.618302] [c6813d90] [c02060c4] hash_recvmsg+0x11c/0x210
> [   44.623716] [c6813db0] [c0331354] ___sys_recvmsg+0x98/0x138
> [   44.629226] [c6813eb0] [c03332c0] __sys_recvmsg+0x40/0x84
> [   44.634562] [c6813f10] [c03336c0] SyS_socketcall+0xb8/0x1d4
> [   44.640073] [c6813f40] [c000d1ac] ret_from_syscall+0x0/0x38
> [   44.645530] Instruction dump:
> [   44.648465] 38c00001 7f63db78 4e800421 7c791b78 54690ffe 0f090000 80ff0190 2f870000
> [   44.656122] 40befe50 2f990001 409e0210 813f01bc <8129000c> b39e003a 7d29c214 913e003c
> 
> This patch fixes that Oops by checking if src is NULL.
> 
> Fixes: 6a1e8d14156d4 ("crypto: talitos - making mapping helpers more generic")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Isn't this needed also in 4.15.y?

Thanks,
Horia