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Message-ID: <20190917184023.16701-1-erosca@de.adit-jv.com>
Date: Tue, 17 Sep 2019 20:40:22 +0200
From: Eugeniu Rosca <erosca@...adit-jv.com>
To: Shuah Khan <shuah@...nel.org>,
"George G. Davis" <george_davis@...tor.com>,
Jerry Hoemann <jerry.hoemann@....com>,
Colin Ian King <colin.king@...onical.com>,
<linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Eugeniu Rosca <erosca@...adit-jv.com>,
Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: [PATCH v3 1/2] selftests: watchdog: Validate optional file argument
From: "George G. Davis" <george_davis@...tor.com>
The newly added optional file argument does not validate if the
file is indeed a watchdog, e.g.:
./watchdog-test -f /dev/zero
Watchdog Ticking Away!
Fix it by confirming that the WDIOC_GETSUPPORT ioctl succeeds.
Fixes: c3f2490d6e9257 ("selftests: watchdog: Add optional file argument")
Reported-by: Eugeniu Rosca <erosca@...adit-jv.com>
Signed-off-by: George G. Davis <george_davis@...tor.com>
Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>
---
v3:
- Used v1 as starting point and simplified commit description
- Added Fixes tag (WARNING: commit id is from linux-next!)
- No change in the contents
- Applied cleanly to the same base as used in [v1]
v2:
- https://patchwork.kernel.org/patch/11147663/
v1:
- https://patchwork.kernel.org/patch/11136283/
- Applied/tested on commit ce54eab71e210f ("kunit: fix failure to build without printk") of
https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=next
---
tools/testing/selftests/watchdog/watchdog-test.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
index afff120c7be6..6ed822dc2222 100644
--- a/tools/testing/selftests/watchdog/watchdog-test.c
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -97,6 +97,7 @@ int main(int argc, char *argv[])
int c;
int oneshot = 0;
char *file = "/dev/watchdog";
+ struct watchdog_info info;
setbuf(stdout, NULL);
@@ -118,6 +119,16 @@ int main(int argc, char *argv[])
exit(-1);
}
+ /*
+ * Validate that `file` is a watchdog device
+ */
+ ret = ioctl(fd, WDIOC_GETSUPPORT, &info);
+ if (ret) {
+ printf("WDIOC_GETSUPPORT error '%s'\n", strerror(errno));
+ close(fd);
+ exit(ret);
+ }
+
optind = 0;
while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
--
2.23.0
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