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From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH -mm] proc: fixup test for read
Date: Sat, 17 Mar 2018 02:21:47 +0300
Message-ID: <20180316232147.GA20146@avx2> (raw)

/proc/kmsg can and will block if read under root.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 tools/testing/selftests/proc/read.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/proc/read.c
+++ b/tools/testing/selftests/proc/read.c
@@ -54,7 +54,8 @@ static void f_reg(DIR *d, const char *filename)
 	int fd;
 	ssize_t rv;
 
-	fd = openat(dirfd(d), filename, O_RDONLY);
+	/* read from /proc/kmsg can block */
+	fd = openat(dirfd(d), filename, O_RDONLY|O_NONBLOCK);
 	if (fd == -1)
 		return;
 	rv = read(fd, buf, sizeof(buf));

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-16 23:21 Alexey Dobriyan [this message]
2018-03-16 23:28 ` Andrew Morton

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