hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

random: fix possible sleeping allocation from irq context 

We can do a sleeping allocation from an irq context when CONFIG_NUMA
is enabled.  Fix this by initializing the NUMA crng instances in a
workqueue.

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot+9de458f6a5e713ee8c1a@syzkaller.appspotmail.com
Fixes: 8ef35c866f ("random: set up the NUMA crng instances...")
Cc: stable@vger.kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2018-04-23 18:51:28 -04:00
parent d848e5f8e1
commit 6c1e851c4e
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/char/random.c
View File

@ -789,7 +789,7 @@ static void crng_initialize(struct crng_state *crng)
} }
#ifdef CONFIG_NUMA #ifdef CONFIG_NUMA
static void numa_crng_init(void) static void do_numa_crng_init(struct work_struct *work)
{ {
int i; int i;
struct crng_state *crng; struct crng_state *crng;
@ -810,6 +810,13 @@ static void numa_crng_init(void)
kfree(pool); kfree(pool);
} }
} }
static DECLARE_WORK(numa_crng_init_work, do_numa_crng_init);
static void numa_crng_init(void)
{
schedule_work(&numa_crng_init_work);
}
#else #else
static void numa_crng_init(void) {} static void numa_crng_init(void) {}
#endif #endif