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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-14 09:47:01 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-14 09:47:01 -0800
commitfee5429e028c414d80d036198db30454cfd91b7a (patch)
tree485f37a974e4ab85339021c794d1782e2d761c5b /lib/string.c
parent83e047c104aa95a8a683d6bd421df1551c17dbd2 (diff)
parent96692a7305c49845e3cbf5a60cfcb207c5dc4030 (diff)
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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto update from Herbert Xu: "Here is the crypto update for 3.20: - Added 192/256-bit key support to aesni GCM. - Added MIPS OCTEON MD5 support. - Fixed hwrng starvation and race conditions. - Added note that memzero_explicit is not a subsitute for memset. - Added user-space interface for crypto_rng. - Misc fixes" * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (71 commits) crypto: tcrypt - do not allocate iv on stack for aead speed tests crypto: testmgr - limit IV copy length in aead tests crypto: tcrypt - fix buflen reminder calculation crypto: testmgr - mark rfc4106(gcm(aes)) as fips_allowed crypto: caam - fix resource clean-up on error path for caam_jr_init crypto: caam - pair irq map and dispose in the same function crypto: ccp - terminate ccp_support array with empty element crypto: caam - remove unused local variable crypto: caam - remove dead code crypto: caam - don't emit ICV check failures to dmesg hwrng: virtio - drop extra empty line crypto: replace scatterwalk_sg_next with sg_next crypto: atmel - Free memory in error path crypto: doc - remove colons in comments crypto: seqiv - Ensure that IV size is at least 8 bytes crypto: cts - Weed out non-CBC algorithms MAINTAINERS: add linux-crypto to hw random crypto: cts - Remove bogus use of seqiv crypto: qat - don't need qat_auth_state struct crypto: algif_rng - fix sparse non static symbol warning ...
Diffstat (limited to 'lib/string.c')
-rw-r--r--lib/string.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
index cdd97f431ae2..ce81aaec3839 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -596,6 +596,11 @@ EXPORT_SYMBOL(memset);
* @s: Pointer to the start of the area.
* @count: The size of the area.
*
+ * Note: usually using memset() is just fine (!), but in cases
+ * where clearing out _local_ data at the end of a scope is
+ * necessary, memzero_explicit() should be used instead in
+ * order to prevent the compiler from optimising away zeroing.
+ *
* memzero_explicit() doesn't need an arch-specific version as
* it just invokes the one of memset() implicitly.
*/