diff options
| author | Leo Stone <leocstone@gmail.com> | 2024-12-17 10:26:57 -0800 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2025-01-04 22:46:09 -0500 |
| commit | f09ff307c7299392f1c88f763299e24bc99811c7 (patch) | |
| tree | f2537747b01669ab9d13330d09661488e3d81c91 | |
| parent | 3b44cd0998678b55a0df20b514bca0e298f4ff48 (diff) | |
safesetid: check size of policy writes
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>
| -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; |