diff mbox series

[02/12] coredump: fix core_pattern parse error

Message ID 20201206061442.va_wmK_ha%akpm@linux-foundation.org
State New
Headers show
Series None | expand

Commit Message

Andrew Morton Dec. 6, 2020, 6:14 a.m. UTC 
From: Menglong Dong <dong.menglong@zte.com.cn>
Subject: coredump: fix core_pattern parse error

'format_corename()' will splite 'core_pattern' on spaces when it is in
pipe mode, and take helper_argv[0] as the path to usermode executable.

It works fine in most cases. However, if there is a space between
'|' and '/file/path', such as
'| /usr/lib/systemd/systemd-coredump %P %u %g',
helper_argv[0] will be parsed as '', and users will get a
'Core dump to | disabled'.

It is not friendly to users, as the pattern above was valid previously. 
Fix this by ignoring the spaces between '|' and '/file/path'.

Link: https://lkml.kernel.org/r/5fb62870.1c69fb81.8ef5d.af76@mx.google.com
Fixes: 315c69261dd3 ("coredump: split pipe command whitespace before expanding template")
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Cc: Paul Wise <pabs3@bonedaddy.net>
Cc: Jakub Wilk <jwilk@jwilk.net> [https://bugs.debian.org/924398]
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/coredump.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/fs/coredump.c~coredump-fix-core_pattern-parse-error
+++ a/fs/coredump.c
@@ -229,7 +229,8 @@  static int format_corename(struct core_n
 		 */
 		if (ispipe) {
 			if (isspace(*pat_ptr)) {
-				was_space = true;
+				if (cn->used != 0)
+					was_space = true;
 				pat_ptr++;
 				continue;
 			} else if (was_space) {