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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-06 16:39:54 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-08 12:10:32 +0100 |
| commit | f613d86d014b6375a4085901de39406598121e35 (patch) | |
| tree | 547c8ed1ab20103ae132cf5ace27714f12062e88 /kernel/sysctl.c | |
| parent | 4762b532ec9539755aab61445d5da6e1926ccb99 (diff) | |
| download | linux-f613d86d014b6375a4085901de39406598121e35.tar.gz linux-f613d86d014b6375a4085901de39406598121e35.tar.bz2 linux-f613d86d014b6375a4085901de39406598121e35.zip | |
sysctl: Fix data races in proc_dointvec_minmax().
A sysctl variable is accessed concurrently, and there is always a chance
of data-race. So, all readers and writers need some basic protection to
avoid load/store-tearing.
This patch changes proc_dointvec_minmax() to use READ_ONCE() and
WRITE_ONCE() internally to fix data-races on the sysctl side. For now,
proc_dointvec_minmax() itself is tolerant to a data-race, but we still
need to add annotations on the other subsystem's side.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 2ab8c2a37e8f..4d87832367f2 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -857,7 +857,7 @@ static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, if ((param->min && *param->min > tmp) || (param->max && *param->max < tmp)) return -EINVAL; - *valp = tmp; + WRITE_ONCE(*valp, tmp); } return 0; |