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authorEric Biggers <ebiggers@google.com>2018-01-24 00:31:27 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2018-02-08 22:37:05 +1100
commiteff84b379089cd8b4e83599639c1f5f6e34ef7bf (patch)
treee217b62e4b3cf4db367831324ca4a738d7456933 /arch/x86/crypto
parent2d55807b7f7bf62bb05a8b91247c5eb7cd19ac04 (diff)
downloadlinux-eff84b379089cd8b4e83599639c1f5f6e34ef7bf.tar.bz2
crypto: sha512-mb - initialize pending lengths correctly
The SHA-512 multibuffer code keeps track of the number of blocks pending in each lane. The minimum of these values is used to identify the next lane that will be completed. Unused lanes are set to a large number (0xFFFFFFFF) so that they don't affect this calculation. However, it was forgotten to set the lengths to this value in the initial state, where all lanes are unused. As a result it was possible for sha512_mb_mgr_get_comp_job_avx2() to select an unused lane, causing a NULL pointer dereference. Specifically this could happen in the case where ->update() was passed fewer than SHA512_BLOCK_SIZE bytes of data, so it then called sha_complete_job() without having actually submitted any blocks to the multi-buffer code. This hit a NULL pointer dereference if another task happened to have submitted blocks concurrently to the same CPU and the flush timer had not yet expired. Fix this by initializing sha512_mb_mgr->lens correctly. As usual, this bug was found by syzkaller. Fixes: 45691e2d9b18 ("crypto: sha512-mb - submit/flush routines for AVX2") Reported-by: syzbot <syzkaller@googlegroups.com> Cc: <stable@vger.kernel.org> # v4.8+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/x86/crypto')
-rw-r--r--arch/x86/crypto/sha512-mb/sha512_mb_mgr_init_avx2.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/x86/crypto/sha512-mb/sha512_mb_mgr_init_avx2.c b/arch/x86/crypto/sha512-mb/sha512_mb_mgr_init_avx2.c
index 36870b26067a..d08805032f01 100644
--- a/arch/x86/crypto/sha512-mb/sha512_mb_mgr_init_avx2.c
+++ b/arch/x86/crypto/sha512-mb/sha512_mb_mgr_init_avx2.c
@@ -57,10 +57,12 @@ void sha512_mb_mgr_init_avx2(struct sha512_mb_mgr *state)
{
unsigned int j;
- state->lens[0] = 0;
- state->lens[1] = 1;
- state->lens[2] = 2;
- state->lens[3] = 3;
+ /* initially all lanes are unused */
+ state->lens[0] = 0xFFFFFFFF00000000;
+ state->lens[1] = 0xFFFFFFFF00000001;
+ state->lens[2] = 0xFFFFFFFF00000002;
+ state->lens[3] = 0xFFFFFFFF00000003;
+
state->unused_lanes = 0xFF03020100;
for (j = 0; j < 4; j++)
state->ldata[j].job_in_lane = NULL;