[PATCH 4.9 20/41] smackfs: restrict bytes count in smackfs write functions

[Greg Kroah-Hartman]

From: Sabyrzhan Tasbolatov <snovit...@gmail.com>

commit 7ef4c19d245f3dc233fd4be5acea436edd1d83d8 upstream.

syzbot found WARNINGs in several smackfs write operations where
bytes count is passed to memdup_user_nul which exceeds
GFP MAX_ORDER. Check count size if bigger than PAGE_SIZE.

Per smackfs doc, smk_write_net4addr accepts any label or -CIPSO,
smk_write_net6addr accepts any label or -DELETE. I couldn't find
any general rule for other label lengths except SMK_LABELLEN,
SMK_LONGLABEL, SMK_CIPSOMAX which are documented.

Let's constrain, in general, smackfs label lengths for PAGE_SIZE.
Although fuzzer crashes write to smackfs/netlabel on 0x400000 length.

Here is a quick way to reproduce the WARNING:
python -c "print('A' * 0x400000)" > /sys/fs/smackfs/netlabel

Reported-by: syzbot+a71a442385a0b2815...@syzkaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovit...@gmail.com>
Signed-off-by: Casey Schaufler <ca...@schaufler-ca.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 security/smack/smackfs.c |   21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -1186,7 +1186,7 @@ static ssize_t smk_write_net4addr(struct
                return -EPERM;
        if (*ppos != 0)
                return -EINVAL;
-       if (count < SMK_NETLBLADDRMIN)
+       if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
                return -EINVAL;
 
        data = memdup_user_nul(buf, count);
@@ -1446,7 +1446,7 @@ static ssize_t smk_write_net6addr(struct
                return -EPERM;
        if (*ppos != 0)
                return -EINVAL;
-       if (count < SMK_NETLBLADDRMIN)
+       if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
                return -EINVAL;
 
        data = memdup_user_nul(buf, count);
@@ -1853,6 +1853,10 @@ static ssize_t smk_write_ambient(struct
        if (!smack_privileged(CAP_MAC_ADMIN))
                return -EPERM;
 
+       /* Enough data must be present */
+       if (count == 0 || count > PAGE_SIZE)
+               return -EINVAL;
+
        data = memdup_user_nul(buf, count);
        if (IS_ERR(data))
                return PTR_ERR(data);
@@ -2024,6 +2028,9 @@ static ssize_t smk_write_onlycap(struct
        if (!smack_privileged(CAP_MAC_ADMIN))
                return -EPERM;
 
+       if (count > PAGE_SIZE)
+               return -EINVAL;
+
        data = memdup_user_nul(buf, count);
        if (IS_ERR(data))
                return PTR_ERR(data);
@@ -2111,6 +2118,9 @@ static ssize_t smk_write_unconfined(stru
        if (!smack_privileged(CAP_MAC_ADMIN))
                return -EPERM;
 
+       if (count > PAGE_SIZE)
+               return -EINVAL;
+
        data = memdup_user_nul(buf, count);
        if (IS_ERR(data))
                return PTR_ERR(data);
@@ -2664,6 +2674,10 @@ static ssize_t smk_write_syslog(struct f
        if (!smack_privileged(CAP_MAC_ADMIN))
                return -EPERM;
 
+       /* Enough data must be present */
+       if (count == 0 || count > PAGE_SIZE)
+               return -EINVAL;
+
        data = memdup_user_nul(buf, count);
        if (IS_ERR(data))
                return PTR_ERR(data);
@@ -2756,10 +2770,13 @@ static ssize_t smk_write_relabel_self(st
                return -EPERM;
 
        /*
+        * No partial write.
         * Enough data must be present.
         */
        if (*ppos != 0)
                return -EINVAL;
+       if (count == 0 || count > PAGE_SIZE)
+               return -EINVAL;
 
        data = memdup_user_nul(buf, count);
        if (IS_ERR(data))