Commit ac94b6e3 authored Jan 20, 2016 by Jann Horn Committed by Linus Torvalds Jan 20, 2016

fs/coredump: prevent "" / "." / ".." core path components



Let %h and %e print empty values as "!", "." as "!" and
".." as "!.".

This prevents hostnames and comm values that are empty or consist of one
or two dots from changing the directory level at which the corefile will
be stored.

Consider the case where someone decides to sort coredumps by hostname
with a core pattern like "/cores/%h/core.%e.%p.%t" or so.  In this
case, hostnames "" and "." would cause the coredump to land directly in
/cores, which is not what the intent behind the core pattern is, and
".." would cause the coredump to land in /.

Yeah, there probably aren't many people who do that, but I still don't
want this edgecase to be kind of broken.

It seems very unlikely that this caused security issues anywhere, so I'm
not requesting a stable backport.

[akpm@linux-foundation.org: tweak code comment]
Signed-off-by: Jann Horn <jann@thejh.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent caaee623

fs/coredump.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -118,6 +118,26 @@ int cn_esc_printf(struct core_name cn, const char fmt, ...)
		ret = cn_vprintf(cn, fmt, arg);
		va_end(arg);

		if (ret == 0) {
		/*
		* Ensure that this coredump name component can't cause the
		* resulting corefile path to consist of a ".." or ".".
		*/
		if ((cn->used - cur == 1 && cn->corename[cur] == '.') \|\|
		(cn->used - cur == 2 && cn->corename[cur] == '.'
		&& cn->corename[cur+1] == '.'))
		cn->corename[cur] = '!';

		/*
		* Empty names are fishy and could be used to create a "//" in a
		* corefile name, causing the coredump to happen one directory
		* level too high. Enforce that all components of the core
		* pattern are at least one character long.
		*/
		if (cn->used == cur)
		ret = cn_printf(cn, "!");
		}

		for (; cur < cn->used; ++cur) {
		if (cn->corename[cur] == '/')
		cn->corename[cur] = '!';

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