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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 14:51:45 -0700 |
| commit | 0766f788eb727e2e330d55d30545db65bcf2623f (patch) | |
| tree | 0436ae3b005558a4fb827459fe5c602037fe764a /include/linux/compiler.h | |
| parent | 38addce8b600ca335dc86fa3d48c890f1c6fa1f4 (diff) | |
| download | op-kernel-dev-0766f788eb727e2e330d55d30545db65bcf2623f.zip op-kernel-dev-0766f788eb727e2e330d55d30545db65bcf2623f.tar.gz | |
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 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 6685698..ceaddaf 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -406,6 +406,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s # define __attribute_const__ /* unimplemented */ #endif +#ifndef __latent_entropy +# define __latent_entropy +#endif + /* * Tell gcc if a function is cold. The compiler will assume any path * directly leading to the call is unlikely. |
