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Recently, in commit 13aa93c70e71 ("random: add and use memzero_explicit()
for clearing data"), we have found that GCC may optimize some memset()
cases away when it detects a stack variable is not being used anymore
and going out of scope. This can happen, for example, in cases when we
are clearing out sensitive information such as keying material or any
e.g. intermediate results from crypto computations, etc.
With the help of Coccinelle, we can figure out and fix such occurences
in the crypto subsytem as well. Julia Lawall provided the following
Coccinelle program:
@@
type T;
identifier x;
@@
T x;
... when exists
when any
-memset
+memzero_explicit
(&x,
-0,
...)
... when != x
when strict
@@
type T;
identifier x;
@@
T x[...];
... when exists
when any
-memset
+memzero_explicit
(x,
-0,
...)
... when != x
when strict
Therefore, make use of the drop-in replacement memzero_explicit() for
exactly such cases instead of using memset().
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Replace PTR_ERR followed by ERR_PTR by ERR_CAST, to be more concise.
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression err,x;
@@
- err = PTR_ERR(x);
if (IS_ERR(x))
- return ERR_PTR(err);
+ return ERR_CAST(x);
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Steps to reproduce:
modprobe tcrypt # with CONFIG_DEBUG_SG=y
testing cts(cbc(aes)) encryption
test 1 (128 bit key):
------------[ cut here ]------------
kernel BUG at include/linux/scatterlist.h:65!
invalid opcode: 0000 [1] PREEMPT SMP DEBUG_PAGEALLOC
CPU 0
Modules linked in: tea xts twofish twofish_common tcrypt(+) [maaaany]
Pid: 16151, comm: modprobe Not tainted 2.6.26-rc4-fat #7
RIP: 0010:[<ffffffffa0bf032e>] [<ffffffffa0bf032e>] :cts:cts_cbc_encrypt+0x151/0x355
RSP: 0018:ffff81016f497a88 EFLAGS: 00010286
RAX: ffffe20009535d58 RBX: ffff81016f497af0 RCX: 0000000087654321
RDX: ffff8100010d4f28 RSI: ffff81016f497ee8 RDI: ffff81016f497ac0
RBP: ffff81016f497c38 R08: 0000000000000000 R09: 0000000000000011
R10: ffffffff00000008 R11: ffff8100010d4f28 R12: ffff81016f497ac0
R13: ffff81016f497b30 R14: 0000000000000010 R15: 0000000000000010
FS: 00007fac6fa276f0(0000) GS:ffffffff8060e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007f12ca7cc000 CR3: 000000016f441000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Process modprobe (pid: 16151, threadinfo ffff81016f496000, task ffff8101755b4ae0)
Stack: 0000000000000001 ffff81016f496000 ffffffff80719f78 0000000000000001
0000000000000001 ffffffff8020c87c ffff81016f99c918 20646c756f772049
65687420656b696c 0000000000000020 0000000000000000 0000000033341102
Call Trace:
[<ffffffff8020c87c>] ? restore_args+0x0/0x30
[<ffffffffa04aa311>] ? :aes_generic:crypto_aes_expand_key+0x311/0x369
[<ffffffff802ab453>] ? check_object+0x15a/0x213
[<ffffffff802aad22>] ? init_object+0x6e/0x76
[<ffffffff802ac3ae>] ? __slab_free+0xfc/0x371
[<ffffffffa0bf05ed>] :cts:crypto_cts_encrypt+0xbb/0xca
[<ffffffffa07108de>] ? :crypto_blkcipher:setkey+0xc7/0xec
[<ffffffffa07110b8>] :crypto_blkcipher:async_encrypt+0x38/0x3a
[<ffffffffa2ce9341>] :tcrypt:test_cipher+0x261/0x7c6
[<ffffffffa2cfd9df>] :tcrypt:tcrypt_mod_init+0x9df/0x1b30
[<ffffffff80261e35>] sys_init_module+0x9e/0x1b2
[<ffffffff8020c15a>] system_call_after_swapgs+0x8a/0x8f
Code: 45 c0 e8 aa 24 63 df 48 c1 e8 0c 48 b9 00 00 00 00 00 e2 ff ff 48 8b 55 88 48 6b c0 68 48 01 c8 b9 21 43 65 87 48 39 4d 80 74 04 <0f> 0b eb fe f6 c2 01 74 04 0f 0b eb fe 83 e2 03 4c 89 ef 44 89
RIP [<ffffffffa0bf032e>] :cts:cts_cbc_encrypt+0x151/0x355
RSP <ffff81016f497a88>
---[ end trace e8bahiarjand37fd ]---
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Implement CTS wrapper for CBC mode required for support of AES
encryption support for Kerberos (rfc3962).
Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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