Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.9 52/75] coredump: fix core_pattern parse error | Date | Thu, 10 Dec 2020 15:27:17 +0100 |
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From: Menglong Dong <dong.menglong@zte.com.cn>
commit 2bf509d96d84c3336d08375e8af34d1b85ee71c8 upstream.
'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', then 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'.
Fixes: 315c69261dd3 ("coredump: split pipe command whitespace before expanding template") Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> 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> Link: https://lkml.kernel.org/r/5fb62870.1c69fb81.8ef5d.af76@mx.google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/coredump.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/coredump.c +++ b/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) {
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