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authorEmese Revfy <re.emese@gmail.com>2016-06-20 21:42:34 +0300
committerKees Cook <keescook@chromium.org>2016-10-11 00:51:45 +0300
commit0766f788eb727e2e330d55d30545db65bcf2623f (patch)
tree0436ae3b005558a4fb827459fe5c602037fe764a /kernel/rcu/tiny.c
parent38addce8b600ca335dc86fa3d48c890f1c6fa1f4 (diff)
downloadlinux-0766f788eb727e2e330d55d30545db65bcf2623f.tar.xz
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 'kernel/rcu/tiny.c')
-rw-r--r--kernel/rcu/tiny.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index 944b1b491ed8..1898559e6b60 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -170,7 +170,7 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
false));
}
-static void rcu_process_callbacks(struct softirq_action *unused)
+static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused)
{
__rcu_process_callbacks(&rcu_sched_ctrlblk);
__rcu_process_callbacks(&rcu_bh_ctrlblk);