[syzbot] [kernel?] KASAN: global-out-of-bounds Read in uevent_store

Jeffin Philip posted 1 patch 1 month ago
[syzbot] [kernel?] KASAN: global-out-of-bounds Read in uevent_store
Posted by Jeffin Philip 1 month ago
#syz test: upstream 9d2ed026f031

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index ddbc4d7482d2..b03562301bfe 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -83,7 +83,7 @@ static int kobject_action_type(const char *buf, size_t count,
 	for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
 		if (strncmp(kobject_actions[action], buf, count_first) != 0)
 			continue;
-		if (kobject_actions[action][count_first] != '\0')
+		if (strlen(kobject_actions[action]) != count_first)
 			continue;
 		if (args)
 			*args = args_start;
Re: [syzbot] [kernel?] KASAN: global-out-of-bounds Read in uevent_store
Posted by syzbot 1 month ago
Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+d164947c037324221043@syzkaller.appspotmail.com
Tested-by: syzbot+d164947c037324221043@syzkaller.appspotmail.com

Tested on:

commit:         9d2ed026 Merge tag 'sysctl-7.03-rc1' of git://git.kern..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12f66415580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=996f19b48f3c7123
dashboard link: https://syzkaller.appspot.com/bug?extid=d164947c037324221043
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14e91179580000

Note: testing is done by a robot and is best-effort only.