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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-07-23 17:22:19 +0200 |
|---|---|---|
| committer | Casey Schaufler <casey@schaufler-ca.com> | 2020-07-27 22:35:03 +0200 |
| commit | a6bd4f6d9b07452b0b19842044a6c3ea384b0b88 (patch) | |
| tree | 0f8604f6e759a170eb0e6c5e8e25edd9b0fbc231 /security/smack | |
| parent | Smack: fix use-after-free in smk_write_relabel_self() (diff) | |
| download | linux-a6bd4f6d9b07452b0b19842044a6c3ea384b0b88.tar.xz linux-a6bd4f6d9b07452b0b19842044a6c3ea384b0b88.zip | |
Smack: fix another vsscanf out of bounds
This is similar to commit 84e99e58e8d1 ("Smack: slab-out-of-bounds in
vsscanf") where we added a bounds check on "rule".
Reported-by: syzbot+a22c6092d003d6fe1122@syzkaller.appspotmail.com
Fixes: f7112e6c9abf ("Smack: allow for significantly longer Smack labels v4")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack')
| -rw-r--r-- | security/smack/smackfs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 840a192e9337..2bae1fc493d1 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -905,6 +905,10 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf, for (i = 0; i < catlen; i++) { rule += SMK_DIGITLEN; + if (rule > data + count) { + rc = -EOVERFLOW; + goto out; + } ret = sscanf(rule, "%u", &cat); if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) goto out; |