From 42ccf9d14ede72dd005d3ed97bddb7e29d8570b7 Mon Sep 17 00:00:00 2001 From: Menglong Dong Date: Sat, 5 Dec 2020 22:14:42 -0800 Subject: [PATCH] coredump: fix core_pattern parse error 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 Signed-off-by: Andrew Morton Cc: Paul Wise Cc: Jakub Wilk [https://bugs.debian.org/924398] Cc: Neil Horman Cc: Link: https://lkml.kernel.org/r/5fb62870.1c69fb81.8ef5d.af76@mx.google.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/coredump.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/coredump.c b/fs/coredump.c index 5c0375e7440f..f34767eedf38 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -224,7 +224,8 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm, */ if (ispipe) { if (isspace(*pat_ptr)) { - was_space = true; + if (cn->used != 0) + was_space = true; pat_ptr++; continue; } else if (was_space) {