On 9/16/19 12:49 PM, George G. Davis wrote:
As reported by Eugeniu Rosca, a side of affect of commit c3f2490d6e92 ("selftests: watchdog: Add optional file argument") is that arbitrary files may be opened for watchdog testing, e.g.
You don't need to say this here since you are already have a Reported-by tag. You are missing the Fixes tag.
./watchdog-test -f /dev/zero Watchdog Ticking Away!
To prevent watchdog-test from operating on non-watchdog device files, validate that a file is indeed a watchdog device via an ioctl(WDIOC_GETSUPPORT) call.
While we're at it, since the watchdog_info is available as a result of the ioctl(WDIOC_GETSUPPORT) call, add a command line option to optionally show the watchdog_info.
Let's try this again. I want two patches. The first one with Fixes tag. The first patch might be candidate for going into stables.
The -i (info) should be a separate patch. This won't go into stables.
Please write a clear commit log. The following will help:
https://chris.beams.io/posts/git-commit/
Reported-by: Eugeniu Rosca erosca@de.adit-jv.com Tested-by: Eugeniu Rosca erosca@de.adit-jv.com Signed-off-by: George G. Davis george_davis@mentor.com Signed-off-by: Eugeniu Rosca erosca@de.adit-jv.com
v1: 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/lo... v2: Squashed [1] and [2], and update commit description as discussed in [3]. [1] https://patchwork.kernel.org/patch/11136283/ [2] https://patchwork.kernel.org/patch/11136285/ [3] https://patchwork.kernel.org/patch/11136285/#22883573
tools/testing/selftests/watchdog/watchdog-test.c | 27 +++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c index afff120c7be6..f45e510500c0 100644 --- a/tools/testing/selftests/watchdog/watchdog-test.c +++ b/tools/testing/selftests/watchdog/watchdog-test.c @@ -19,7 +19,7 @@ int fd; const char v = 'V'; -static const char sopts[] = "bdehp:t:Tn:NLf:"; +static const char sopts[] = "bdehp:t:Tn:NLf:i"; static const struct option lopts[] = { {"bootstatus", no_argument, NULL, 'b'}, {"disable", no_argument, NULL, 'd'}, @@ -32,6 +32,7 @@ static const struct option lopts[] = { {"getpretimeout", no_argument, NULL, 'N'}, {"gettimeleft", no_argument, NULL, 'L'}, {"file", required_argument, NULL, 'f'},
- {"info", no_argument, NULL, 'i'}, {NULL, no_argument, NULL, 0x0} };
@@ -72,6 +73,7 @@ static void usage(char *progname) printf("Usage: %s [options]\n", progname); printf(" -f, --file\t\tOpen watchdog device file\n"); printf("\t\t\tDefault is /dev/watchdog\n");
- printf(" -i, --info\t\tShow watchdog_info\n"); printf(" -b, --bootstatus\tGet last boot status (Watchdog/POR)\n"); printf(" -d, --disable\t\tTurn off the watchdog timer\n"); printf(" -e, --enable\t\tTurn on the watchdog timer\n");
@@ -97,6 +99,7 @@ int main(int argc, char *argv[]) int c; int oneshot = 0; char *file = "/dev/watchdog";
- struct watchdog_info info;
setbuf(stdout, NULL); @@ -118,6 +121,16 @@ 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) { @@ -205,6 +218,18 @@ int main(int argc, char *argv[]) case 'f': /* Handled above */ break;
case 'i':/** watchdog_info was obtained as part of file open* validation. So we just show it here.*/oneshot = 1;printf("watchdog_info:\n");printf(" identity:\t\t%s\n", info.identity);printf(" firmware_version:\t%u\n",info.firmware_version);printf(" options:\t\t%08x\n", info.options);break;default: usage(argv[0]);
thanks, -- Shuah