mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-24 06:59:27 -05:00
101 lines
4.2 KiB
Diff
101 lines
4.2 KiB
Diff
From f5527fffff3f002b0a6b376163613b82f69de073 Mon Sep 17 00:00:00 2001
|
|
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
|
|
Date: Thu, 24 Nov 2016 13:23:10 +0000
|
|
Subject: mpi: Fix NULL ptr dereference in mpi_powm() [ver #3]
|
|
|
|
This fixes CVE-2016-8650.
|
|
|
|
If mpi_powm() is given a zero exponent, it wants to immediately return
|
|
either 1 or 0, depending on the modulus. However, if the result was
|
|
initalised with zero limb space, no limbs space is allocated and a
|
|
NULL-pointer exception ensues.
|
|
|
|
Fix this by allocating a minimal amount of limb space for the result when
|
|
the 0-exponent case when the result is 1 and not touching the limb space
|
|
when the result is 0.
|
|
|
|
This affects the use of RSA keys and X.509 certificates that carry them.
|
|
|
|
BUG: unable to handle kernel NULL pointer dereference at (null)
|
|
IP: [<ffffffff8138ce5d>] mpi_powm+0x32/0x7e6
|
|
PGD 0
|
|
Oops: 0002 [#1] SMP
|
|
Modules linked in:
|
|
CPU: 3 PID: 3014 Comm: keyctl Not tainted 4.9.0-rc6-fscache+ #278
|
|
Hardware name: ASUS All Series/H97-PLUS, BIOS 2306 10/09/2014
|
|
task: ffff8804011944c0 task.stack: ffff880401294000
|
|
RIP: 0010:[<ffffffff8138ce5d>] [<ffffffff8138ce5d>] mpi_powm+0x32/0x7e6
|
|
RSP: 0018:ffff880401297ad8 EFLAGS: 00010212
|
|
RAX: 0000000000000000 RBX: ffff88040868bec0 RCX: ffff88040868bba0
|
|
RDX: ffff88040868b260 RSI: ffff88040868bec0 RDI: ffff88040868bee0
|
|
RBP: ffff880401297ba8 R08: 0000000000000000 R09: 0000000000000000
|
|
R10: 0000000000000047 R11: ffffffff8183b210 R12: 0000000000000000
|
|
R13: ffff8804087c7600 R14: 000000000000001f R15: ffff880401297c50
|
|
FS: 00007f7a7918c700(0000) GS:ffff88041fb80000(0000) knlGS:0000000000000000
|
|
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
|
|
CR2: 0000000000000000 CR3: 0000000401250000 CR4: 00000000001406e0
|
|
Stack:
|
|
ffff88040868bec0 0000000000000020 ffff880401297b00 ffffffff81376cd4
|
|
0000000000000100 ffff880401297b10 ffffffff81376d12 ffff880401297b30
|
|
ffffffff81376f37 0000000000000100 0000000000000000 ffff880401297ba8
|
|
Call Trace:
|
|
[<ffffffff81376cd4>] ? __sg_page_iter_next+0x43/0x66
|
|
[<ffffffff81376d12>] ? sg_miter_get_next_page+0x1b/0x5d
|
|
[<ffffffff81376f37>] ? sg_miter_next+0x17/0xbd
|
|
[<ffffffff8138ba3a>] ? mpi_read_raw_from_sgl+0xf2/0x146
|
|
[<ffffffff8132a95c>] rsa_verify+0x9d/0xee
|
|
[<ffffffff8132acca>] ? pkcs1pad_sg_set_buf+0x2e/0xbb
|
|
[<ffffffff8132af40>] pkcs1pad_verify+0xc0/0xe1
|
|
[<ffffffff8133cb5e>] public_key_verify_signature+0x1b0/0x228
|
|
[<ffffffff8133d974>] x509_check_for_self_signed+0xa1/0xc4
|
|
[<ffffffff8133cdde>] x509_cert_parse+0x167/0x1a1
|
|
[<ffffffff8133d609>] x509_key_preparse+0x21/0x1a1
|
|
[<ffffffff8133c3d7>] asymmetric_key_preparse+0x34/0x61
|
|
[<ffffffff812fc9f3>] key_create_or_update+0x145/0x399
|
|
[<ffffffff812fe227>] SyS_add_key+0x154/0x19e
|
|
[<ffffffff81001c2b>] do_syscall_64+0x80/0x191
|
|
[<ffffffff816825e4>] entry_SYSCALL64_slow_path+0x25/0x25
|
|
Code: 56 41 55 41 54 53 48 81 ec a8 00 00 00 44 8b 71 04 8b 42 04 4c 8b 67 18 45 85 f6 89 45 80 0f 84 b4 06 00 00 85 c0 75 2f 41 ff ce <49> c7 04 24 01 00 00 00 b0 01 75 0b 48 8b 41 18 48 83 38 01 0f
|
|
RIP [<ffffffff8138ce5d>] mpi_powm+0x32/0x7e6
|
|
RSP <ffff880401297ad8>
|
|
CR2: 0000000000000000
|
|
---[ end trace d82015255d4a5d8d ]---
|
|
|
|
Basically, this is a backport of a libgcrypt patch:
|
|
|
|
http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=patch;h=6e1adb05d290aeeb1c230c763970695f4a538526
|
|
|
|
Fixes: cdec9cb5167a ("crypto: GnuPG based MPI lib - source files (part 1)")
|
|
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
|
|
Signed-off-by: David Howells <dhowells@redhat.com>
|
|
cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
|
|
cc: linux-ima-devel@lists.sourceforge.net
|
|
cc: stable@vger.kernel.org
|
|
Signed-off-by: James Morris <james.l.morris@oracle.com>
|
|
---
|
|
lib/mpi/mpi-pow.c | 7 ++++++-
|
|
1 file changed, 6 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/lib/mpi/mpi-pow.c b/lib/mpi/mpi-pow.c
|
|
index 5464c87..e24388a 100644
|
|
--- a/lib/mpi/mpi-pow.c
|
|
+++ b/lib/mpi/mpi-pow.c
|
|
@@ -64,8 +64,13 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
|
|
if (!esize) {
|
|
/* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0
|
|
* depending on if MOD equals 1. */
|
|
- rp[0] = 1;
|
|
res->nlimbs = (msize == 1 && mod->d[0] == 1) ? 0 : 1;
|
|
+ if (res->nlimbs) {
|
|
+ if (mpi_resize(res, 1) < 0)
|
|
+ goto enomem;
|
|
+ rp = res->d;
|
|
+ rp[0] = 1;
|
|
+ }
|
|
res->sign = 0;
|
|
goto leave;
|
|
}
|
|
--
|
|
cgit v1.1
|
|
|