linux-kernel - [PATCH AUTOSEL 5.15 03/10] jfs: Fix fortify moan in symlink

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Date:   Sat, 17 Dec 2022 10:28:53 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Dr. David Alan Gilbert" <linux@...blig.org>,
        syzbot+5fc38b2ddbbca7f5c680@...kaller.appspotmail.com,
        Kees Cook <keescook@...omium.org>,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Sasha Levin <sashal@...nel.org>, shaggy@...nel.org,
        brauner@...nel.org, jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 5.15 03/10] jfs: Fix fortify moan in symlink

From: "Dr. David Alan Gilbert" <linux@...blig.org>

[ Upstream commit ebe060369f8d6e4588b115f252bebf5ba4d64350 ]

JFS has in jfs_incore.h:

      /* _inline may overflow into _inline_ea when needed */
      /* _inline_ea may overlay the last part of
       * file._xtroot if maxentry = XTROOTINITSLOT
       */
      union {
        struct {
          /* 128: inline symlink */
          unchar _inline[128];
          /* 128: inline extended attr */
          unchar _inline_ea[128];
        };
        unchar _inline_all[256];

and currently the symlink code copies into _inline;
if this is larger than 128 bytes it triggers a fortify warning of the
form:

  memcpy: detected field-spanning write (size 132) of single field
     "ip->i_link" at fs/jfs/namei.c:950 (size 18446744073709551615)

when it's actually OK.

Copy it into _inline_all instead.

Reported-by: syzbot+5fc38b2ddbbca7f5c680@...kaller.appspotmail.com
Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jfs/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 9db4f5789c0e..4fbbf88435e6 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -946,7 +946,7 @@ static int jfs_symlink(struct user_namespace *mnt_userns, struct inode *dip,
 	if (ssize <= IDATASIZE) {
 		ip->i_op = &jfs_fast_symlink_inode_operations;
 
-		ip->i_link = JFS_IP(ip)->i_inline;
+		ip->i_link = JFS_IP(ip)->i_inline_all;
 		memcpy(ip->i_link, name, ssize);
 		ip->i_size = ssize - 1;
 
-- 
2.35.1