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eventpoll: Annotate data-race of busy_poll_usecs

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commit b9ca079dd6 upstream.

A struct eventpoll's busy_poll_usecs field can be modified via a user
ioctl at any time. All reads of this field should be annotated with
READ_ONCE.

Fixes: 85455c795c ("eventpoll: support busy poll per epoll instance")
Cc: stable@vger.kernel.org
Signed-off-by: Martin Karsten <mkarsten@uwaterloo.ca>
Link: https://lore.kernel.org/r/20240806123301.167557-1-jdamato@fastly.com
Reviewed-by: Joe Damato <jdamato@fastly.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Karsten
2024-08-06 12:33:01 +00:00
committed by Greg Kroah-Hartman
parent 483397b4ba
commit 271fdbc0b7
1 changed files with 1 additions and 1 deletions
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2
fs/eventpoll.c
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@@ -420,7 +420,7 @@ static bool busy_loop_ep_timeout(unsigned long start_time,
static bool ep_busy_loop_on(struct eventpoll *ep)
{
return !!ep->busy_poll_usecs || net_busy_loop_on();
return !!READ_ONCE(ep->busy_poll_usecs) || net_busy_loop_on();
}
static bool ep_busy_loop_end(void *p, unsigned long start_time)