diff options
| author | Leo Stone <leocstone@gmail.com> | 2024-12-17 10:26:57 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-13 12:50:17 +0100 |
| commit | ecf6a4a558097920447a6fb84dfdb279e2ac749a (patch) | |
| tree | 34e77afb94212d6d0aca6161bfaf2b1cda559f35 /security | |
| parent | bb8ff054e19fe27f4e5eaac1b05e462894cfe9b1 (diff) | |
safesetid: check size of policy writes
[ Upstream commit f09ff307c7299392f1c88f763299e24bc99811c7 ]
syzbot attempts to write a buffer with a large size to a sysfs entry
with writes handled by handle_policy_update(), triggering a warning
in kmalloc.
Check the size specified for write buffers before allocating.
Reported-by: syzbot+4eb7a741b3216020043a@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=4eb7a741b3216020043a
Signed-off-by: Leo Stone <leocstone@gmail.com>
[PM: subject tweak]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/safesetid/securityfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/security/safesetid/securityfs.c b/security/safesetid/securityfs.c index 25310468bcdd..8e1ffd70b18a 100644 --- a/security/safesetid/securityfs.c +++ b/security/safesetid/securityfs.c @@ -143,6 +143,9 @@ static ssize_t handle_policy_update(struct file *file, char *buf, *p, *end; int err; + if (len >= KMALLOC_MAX_SIZE) + return -EINVAL; + pol = kmalloc(sizeof(struct setid_ruleset), GFP_KERNEL); if (!pol) return -ENOMEM; |