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This adds a memzero_explicit() call which is guaranteed not to be

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optimized away by GCC.  This is important when we are wiping
 cryptographically sensitive material.
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Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random

Pull /dev/random updates from Ted Ts'o:
 "This adds a memzero_explicit() call which is guaranteed not to be
  optimized away by GCC.  This is important when we are wiping
  cryptographically sensitive material"

* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  crypto: memzero_explicit - make sure to clear out sensitive data
  random: add and use memzero_explicit() for clearing data
This commit is contained in:
Linus Torvalds 2014-10-24 12:33:32 -07:00
commit 14d4cc0883
10 changed files with 36 additions and 19 deletions
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16
lib/string.c
View file

@ -598,6 +598,22 @@ void *memset(void *s, int c, size_t count)
EXPORT_SYMBOL(memset);
#endif
/**
* memzero_explicit - Fill a region of memory (e.g. sensitive
* keying data) with 0s.
* @s: Pointer to the start of the area.
* @count: The size of the area.
*
* memzero_explicit() doesn't need an arch-specific version as
* it just invokes the one of memset() implicitly.
*/
void memzero_explicit(void *s, size_t count)
{
memset(s, 0, count);
OPTIMIZER_HIDE_VAR(s);
}
EXPORT_SYMBOL(memzero_explicit);
#ifndef __HAVE_ARCH_MEMCPY
/**
* memcpy - Copy one area of memory to another