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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-06 16:39:55 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-21 21:24:20 +0200 |
| commit | 40e0477a7371d101c55b69d9c32a7a1ed82ab5ea (patch) | |
| tree | 0bd6f4db4ca751517543c3ab948c581e9cf9781c /kernel | |
| parent | 32d7f8da824407889eafc07b0c8ee7920648b571 (diff) | |
| download | linux-stable-40e0477a7371d101c55b69d9c32a7a1ed82ab5ea.tar.gz linux-stable-40e0477a7371d101c55b69d9c32a7a1ed82ab5ea.tar.bz2 linux-stable-40e0477a7371d101c55b69d9c32a7a1ed82ab5ea.zip | |
sysctl: Fix data races in proc_douintvec_minmax().
[ Upstream commit 2d3b559df3ed39258737789aae2ae7973d205bc1 ]
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_douintvec_minmax() to use READ_ONCE() and
WRITE_ONCE() internally to fix data-races on the sysctl side. For now,
proc_douintvec_minmax() itself is tolerant to a data-race, but we still
need to add annotations on the other subsystem's side.
Fixes: 61d9b56a8920 ("sysctl: add unsigned int range support")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -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 f5134435fb9c..bdb2f17b723f 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1054,7 +1054,7 @@ static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, (param->max && *param->max < tmp)) return -ERANGE; - *valp = tmp; + WRITE_ONCE(*valp, tmp); } return 0; |