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Date: Wed, 3 Dec 2014 11:04:54 -0200
From: Rafael Aquini <aquini@...hat.com>
To: Andrey Ryabinin <a.ryabinin@...sung.com>
Cc: akpm@...ux-foundation.org, Dmitry Vyukov <dvyukov@...gle.com>,
David Rientjes <rientjes@...gle.com>,
Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
Luiz Capitulino <lcapitulino@...hat.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Nadia.Derbey@...l.net, davidlohr@...com,
Joe Perches <joe@...ches.com>, manfred@...orfullife.com,
avagin@...nvz.org, LKML <linux-kernel@...r.kernel.org>,
Kostya Serebryany <kcc@...gle.com>,
Dmitry Chernenkov <dmitryc@...gle.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Konstantin Khlebnikov <koct9i@...il.com>,
kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [PATCH] kernel: sysctl: use 'unsigned long' type for 'zero'
variable
On Wed, Dec 03, 2014 at 03:41:21PM +0300, Andrey Ryabinin wrote:
>
> Commit ed4d4902ebdd ("mm, hugetlb: remove hugetlb_zero and hugetlb_infinity") replaced
> 'unsigned long hugetlb_zero' with 'int zero' leading to out-of-bounds access
> in proc_doulongvec_minmax():
>
> ==================================================================
> BUG: AddressSanitizer: out of bounds access in
> __do_proc_doulongvec_minmax+0x8a0/0x9a0 at addr ffffffff83980960
> Read of size 8 by task trinity-c14/6919
> Out-of-bounds access to the global variable 'zero'
> [ffffffff83980960-ffffffff83980964) defined at ipc/ipc_sysctl.c:158
>
> CPU: 1 PID: 6919 Comm: trinity-c14 Not tainted 3.18.0-rc1+ #50
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> 0000000000000001 ffff8800b68cf418 ffffffff82c2d3ae 0000000000000000
> ffff8800b68cf4c0 ffff8800b68cf4a8 ffffffff813eaa81 ffffffff0000000c
> ffff88010b003600 ffff8800b68cf479 0000000000000296 0000000000000000
> Call Trace:
> [<ffffffff813ead71>] __asan_report_load8_noabort+0x51/0x70
> mm/kasan/report.c:248
> [<ffffffff810cc3e0>] __do_proc_doulongvec_minmax+0x8a0/0x9a0
> kernel/sysctl.c:2284
> [< inlined >] proc_doulongvec_minmax+0x50/0x80
> do_proc_doulongvec_minmax kernel/sysctl.c:2322
> [<ffffffff810cc530>] proc_doulongvec_minmax+0x50/0x80 kernel/sysctl.c:2345
> [<ffffffff813c9e5a>] hugetlb_sysctl_handler_common+0x12a/0x3c0
> mm/hugetlb.c:2270
> [<ffffffff813cb45c>] hugetlb_mempolicy_sysctl_handler+0x1c/0x20
> mm/hugetlb.c:2293
> [<ffffffff8153e6e9>] proc_sys_call_handler+0x179/0x1f0
> fs/proc/proc_sysctl.c:506
> [<ffffffff8153e76f>] proc_sys_write+0xf/0x20 fs/proc/proc_sysctl.c:524
> [<ffffffff813f1563>] __kernel_write+0x123/0x440 fs/read_write.c:502
> [<ffffffff8147ebaa>] write_pipe_buf+0x14a/0x1d0 fs/splice.c:1074
> [< inlined >] __splice_from_pipe+0x22e/0x6f0
> splice_from_pipe_feed fs/splice.c:769
> [<ffffffff8147dbde>] __splice_from_pipe+0x22e/0x6f0 fs/splice.c:886
> [<ffffffff81483211>] splice_from_pipe+0xc1/0x110 fs/splice.c:921
> [<ffffffff81483298>] default_file_splice_write+0x18/0x50 fs/splice.c:1086
> [< inlined >] direct_splice_actor+0x104/0x1c0 do_splice_from
> fs/splice.c:1128
> [<ffffffff8147cfc4>] direct_splice_actor+0x104/0x1c0 fs/splice.c:1284
> [<ffffffff8147e5ba>] splice_direct_to_actor+0x24a/0x6f0 fs/splice.c:1237
> [<ffffffff81483424>] do_splice_direct+0x154/0x270 fs/splice.c:1327
> [<ffffffff813f3bfb>] do_sendfile+0x5fb/0x1260 fs/read_write.c:1266
> [< inlined >] SyS_sendfile64+0xfa/0x100 SYSC_sendfile64
> fs/read_write.c:1327
> [<ffffffff813f6bea>] SyS_sendfile64+0xfa/0x100 fs/read_write.c:1313
> [<ffffffff82c464f9>] ia32_do_call+0x13/0x13 arch/x86/ia32/ia32entry.S:444
> Memory state around the buggy address:
> ffffffff83980680: 04 f8 f8 f8 f8 f8 f8 f8 02 f8 f8 f8 f8 f8 f8 f8
> ffffffff83980700: 00 f8 f8 f8 f8 f8 f8 f8 00 f8 f8 f8 f8 f8 f8 f8
> ffffffff83980780: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 00 00 00 00
> ffffffff83980800: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 04 f8 f8 f8
> ffffffff83980880: f8 f8 f8 f8 04 f8 f8 f8 f8 f8 f8 f8 04 f8 f8 f8
> >ffffffff83980900: f8 f8 f8 f8 04 f8 f8 f8 f8 f8 f8 f8 04 f8 f8 f8
> ^
> ffffffff83980980: f8 f8 f8 f8 00 00 00 00 f8 f8 f8 f8 00 00 00 00
> ffffffff83980a00: 02 f8 f8 f8 f8 f8 f8 f8 00 00 00 00 00 00 00 00
> ffffffff83980a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffffffff83980b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffffffff83980b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ==================================================================
>
> Use the 'unsigned long' type for 'zero' variable to fix this.
> Changing type to 'unsigned long' shouldn't affect any other users
> of this variable.
>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Fixes: ed4d4902ebdd ("mm, hugetlb: remove hugetlb_zero and hugetlb_infinity")
> Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>
> ---
> kernel/sysctl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 15f2511..45c45c9 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -120,7 +120,7 @@ static int sixty = 60;
>
> static int __maybe_unused neg_one = -1;
>
> -static int zero;
> +static unsigned long zero;
> static int __maybe_unused one = 1;
> static int __maybe_unused two = 2;
> static int __maybe_unused four = 4;
> --
> 2.2.0
>
Acked-by: Rafael Aquini <aquini@...hat.com>
--
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