[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <524e2d98-f75f-4004-bd3b-39b64864bc3c@linuxfoundation.org>
Date: Wed, 26 Jun 2024 13:33:40 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Ma Ke <make24@...as.ac.cn>, shuah@...nel.org, usama.anjum@...labora.com,
amer.shanawany@...il.com, swarupkotikalapudi@...il.com, kees@...nel.org,
luto@...nel.org, akpm@...ux-foundation.org
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests/capabilities: Fix possible file leak in
copy_fromat_to
On 6/26/24 01:20, Ma Ke wrote:
> The open() function returns -1 on error. openat() and open() initialize
> 'from' and 'to', and only 'from' validated with 'if' statement. If the
> initialization of variable 'to' fails, we should better check the value
> of 'to' and close 'from' to avoid possible file leak.
>
> Fixes: 32ae976ed3b5 ("selftests/capabilities: Add tests for capability evolution")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
> Found this error through static analysis.
Please add this line to change adding details about the tool you used
to find this problem.
> ---
> tools/testing/selftests/capabilities/test_execve.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tools/testing/selftests/capabilities/test_execve.c b/tools/testing/selftests/capabilities/test_execve.c
> index 47bad7ddc5bc..de187eff177d 100644
> --- a/tools/testing/selftests/capabilities/test_execve.c
> +++ b/tools/testing/selftests/capabilities/test_execve.c
> @@ -149,6 +149,10 @@ static void copy_fromat_to(int fromfd, const char *fromname, const char *toname)
> ksft_exit_fail_msg("open copy source - %s\n", strerror(errno));
>
> int to = open(toname, O_CREAT | O_WRONLY | O_EXCL, 0700);
> + if (to == -1) {
Changing this check to < instead of checking for just -1 can catch
other error returns.
> + close(from);
> + ksft_exit_fail_msg("open copy destination - %s\n", strerror(errno));
> + }
>
> while (true) {
> char buf[4096];
thanks,
-- Shuah
Powered by blists - more mailing lists