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| author | Theodore Ts'o <tytso@mit.edu> | 2018-04-12 07:50:45 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-04-14 18:59:31 +0300 |
| commit | 0bb29a849a6433b72e249eea7695477b02056e94 (patch) | |
| tree | 8fe433e610984789e2ffe10d0ba68fc3694afeef /drivers/char/random.c | |
| parent | 8ef35c866f8862df074a49a93b0309725812dea8 (diff) | |
| download | linux-0bb29a849a6433b72e249eea7695477b02056e94.tar.xz | |
random: crng_reseed() should lock the crng instance that it is modifying
Reported-by: Jann Horn <jannh@google.com>
Fixes: 1e7f583af67b ("random: make /dev/urandom scalable for silly...")
Cc: stable@kernel.org # 4.8+
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jann Horn <jannh@google.com>
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 02d792f7933f..898233f594b4 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -906,7 +906,7 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r) _crng_backtrack_protect(&primary_crng, buf.block, CHACHA20_KEY_SIZE); } - spin_lock_irqsave(&primary_crng.lock, flags); + spin_lock_irqsave(&crng->lock, flags); for (i = 0; i < 8; i++) { unsigned long rv; if (!arch_get_random_seed_long(&rv) && @@ -916,7 +916,7 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r) } memzero_explicit(&buf, sizeof(buf)); crng->init_time = jiffies; - spin_unlock_irqrestore(&primary_crng.lock, flags); + spin_unlock_irqrestore(&crng->lock, flags); if (crng == &primary_crng && crng_init < 2) { invalidate_batched_entropy(); numa_crng_init(); |