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| author | Emese Revfy <re.emese@gmail.com> | 2016-06-20 20:42:34 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2016-10-10 23:51:45 +0200 |
| commit | 0766f788eb727e2e330d55d30545db65bcf2623f (patch) | |
| tree | 0436ae3b005558a4fb827459fe5c602037fe764a /lib/random32.c | |
| parent | gcc-plugins: Add latent_entropy plugin (diff) | |
| download | linux-0766f788eb727e2e330d55d30545db65bcf2623f.tar.xz linux-0766f788eb727e2e330d55d30545db65bcf2623f.zip | |
latent_entropy: Mark functions with __latent_entropy
The __latent_entropy gcc attribute can be used only on functions and
variables. If it is on a function then the plugin will instrument it for
gathering control-flow entropy. If the attribute is on a variable then
the plugin will initialize it with random contents. The variable must
be an integer, an integer array type or a structure with integer fields.
These specific functions have been selected because they are init
functions (to help gather boot-time entropy), are called at unpredictable
times, or they have variable loops, each of which provide some level of
latent entropy.
Signed-off-by: Emese Revfy <re.emese@gmail.com>
[kees: expanded commit message]
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'lib/random32.c')
| -rw-r--r-- | lib/random32.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/random32.c b/lib/random32.c index 69ed593aab07..a30923573676 100644 --- a/lib/random32.c +++ b/lib/random32.c @@ -47,7 +47,7 @@ static inline void prandom_state_selftest(void) } #endif -static DEFINE_PER_CPU(struct rnd_state, net_rand_state); +static DEFINE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy; /** * prandom_u32_state - seeded pseudo-random number generator. |