* [LTP] [PATCH] inotify11: Fix race condition between fork() and inotify init
@ 2022-09-08 14:50 Martin Doucha
2022-09-08 15:15 ` Amir Goldstein
0 siblings, 1 reply; 3+ messages in thread
From: Martin Doucha @ 2022-09-08 14:50 UTC (permalink / raw)
To: ltp
When the child process runs a few churn cycles before the parent completes
inotify initialization, the parent will get stuck reading the inotify
file descriptor until it eventually times out. Create inotify watch
befory fork()ing to prevent this race condition.
Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---
testcases/kernel/syscalls/inotify/inotify11.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/testcases/kernel/syscalls/inotify/inotify11.c b/testcases/kernel/syscalls/inotify/inotify11.c
index e426f9e1c..dd32ea7fd 100644
--- a/testcases/kernel/syscalls/inotify/inotify11.c
+++ b/testcases/kernel/syscalls/inotify/inotify11.c
@@ -61,15 +61,16 @@ static void verify_inotify(void)
struct inotify_event *event;
int inotify_fd;
+ inotify_fd = SAFE_MYINOTIFY_INIT();
+ SAFE_MYINOTIFY_ADD_WATCH(inotify_fd, ".", IN_DELETE);
+
pid = SAFE_FORK();
if (pid == 0) {
+ SAFE_CLOSE(inotify_fd);
churn();
return;
}
- inotify_fd = SAFE_MYINOTIFY_INIT();
- SAFE_MYINOTIFY_ADD_WATCH(inotify_fd, ".", IN_DELETE);
-
while (!opened && nevents < CHURN_FILES) {
int i, fd, len;
--
2.37.2
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [LTP] [PATCH] inotify11: Fix race condition between fork() and inotify init
2022-09-08 14:50 [LTP] [PATCH] inotify11: Fix race condition between fork() and inotify init Martin Doucha
@ 2022-09-08 15:15 ` Amir Goldstein
2022-09-09 7:44 ` Petr Vorel
0 siblings, 1 reply; 3+ messages in thread
From: Amir Goldstein @ 2022-09-08 15:15 UTC (permalink / raw)
To: Martin Doucha; +Cc: LTP List
On Thu, Sep 8, 2022 at 5:50 PM Martin Doucha <mdoucha@suse.cz> wrote:
>
> When the child process runs a few churn cycles before the parent completes
> inotify initialization, the parent will get stuck reading the inotify
> file descriptor until it eventually times out. Create inotify watch
> befory fork()ing to prevent this race condition.
>
> Signed-off-by: Martin Doucha <mdoucha@suse.cz>
LGTM
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
> ---
> testcases/kernel/syscalls/inotify/inotify11.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/testcases/kernel/syscalls/inotify/inotify11.c b/testcases/kernel/syscalls/inotify/inotify11.c
> index e426f9e1c..dd32ea7fd 100644
> --- a/testcases/kernel/syscalls/inotify/inotify11.c
> +++ b/testcases/kernel/syscalls/inotify/inotify11.c
> @@ -61,15 +61,16 @@ static void verify_inotify(void)
> struct inotify_event *event;
> int inotify_fd;
>
> + inotify_fd = SAFE_MYINOTIFY_INIT();
> + SAFE_MYINOTIFY_ADD_WATCH(inotify_fd, ".", IN_DELETE);
> +
> pid = SAFE_FORK();
> if (pid == 0) {
> + SAFE_CLOSE(inotify_fd);
> churn();
> return;
> }
>
> - inotify_fd = SAFE_MYINOTIFY_INIT();
> - SAFE_MYINOTIFY_ADD_WATCH(inotify_fd, ".", IN_DELETE);
> -
> while (!opened && nevents < CHURN_FILES) {
> int i, fd, len;
>
> --
> 2.37.2
>
>
> --
> Mailing list info: https://lists.linux.it/listinfo/ltp
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-09-09 7:44 UTC | newest]
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2022-09-08 14:50 [LTP] [PATCH] inotify11: Fix race condition between fork() and inotify init Martin Doucha
2022-09-08 15:15 ` Amir Goldstein
2022-09-09 7:44 ` Petr Vorel
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