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safesetid: check size of policy writes

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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>
This commit is contained in:
Leo Stone 2024-12-17 10:26:57 -08:00 committed by Paul Moore
parent 3b44cd0998
commit f09ff307c7
1 changed files with 3 additions and 0 deletions
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3
security/safesetid/securityfs.c
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@ -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;