[syzbot] [hfs?] KMSAN: uninit-value in hfsplus_listxattr (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: fec50db7033e Linux 6.9-rc3
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1467098d180000
kernel config: https://syzkaller.appspot.com/x/.config?x=13e7da432565d94c
dashboard link: https://syzkaller.appspot.com/bug?extid=01ade747b16e9c8030e0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138f4d8d180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15763da9180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/901017b36ccc/disk-fec50db7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/16bfcf5618d3/vmlinux-fec50db7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dc9c5a1e7d02/bzImage-fec50db7.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/4dff8cc527ea/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01ade7...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 1024
=====================================================
BUG: KMSAN: uninit-value in strncmp+0x11e/0x180 lib/string.c:291
strncmp+0x11e/0x180 lib/string.c:291
hfsplus_listxattr+0x97d/0x1a60
vfs_listxattr fs/xattr.c:493 [inline]
listxattr+0x1f3/0x6b0 fs/xattr.c:840
path_listxattr fs/xattr.c:864 [inline]
__do_sys_listxattr fs/xattr.c:876 [inline]
__se_sys_listxattr fs/xattr.c:873 [inline]
__x64_sys_listxattr+0x16b/0x2f0 fs/xattr.c:873
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x72/0x7a

Uninit was created at:
slab_post_alloc_hook mm/slub.c:3804 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmalloc_trace+0x578/0xba0 mm/slub.c:3992
kmalloc include/linux/slab.h:628 [inline]
hfsplus_listxattr+0x4cc/0x1a60 fs/hfsplus/xattr.c:701
vfs_listxattr fs/xattr.c:493 [inline]
listxattr+0x1f3/0x6b0 fs/xattr.c:840
path_listxattr fs/xattr.c:864 [inline]
__do_sys_listxattr fs/xattr.c:876 [inline]
__se_sys_listxattr fs/xattr.c:873 [inline]
__x64_sys_listxattr+0x16b/0x2f0 fs/xattr.c:873
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x72/0x7a

CPU: 0 PID: 5019 Comm: syz-executor940 Not tainted 6.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================


---
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[Edward Adam Davis]

please test uini in hfsplus_listxattr

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fec50db7033e

diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index 9c9ff6b8c6f7..858029b1c173 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -698,7 +698,7 @@ ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
return err;
}

- strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
+ strbuf = kzalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
if (!strbuf) {
res = -ENOMEM;

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+01ade7...@syzkaller.appspotmail.com

Tested on:

commit: fec50db7 Linux 6.9-rc3
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1451495b180000

kernel config: https://syzkaller.appspot.com/x/.config?x=13e7da432565d94c
dashboard link: https://syzkaller.appspot.com/bug?extid=01ade747b16e9c8030e0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=1613e213180000

Note: testing is done by a robot and is best-effort only.

[Edward Adam Davis]

[syzbot reported]

[Fix]
When allocating memory to strbuf, initialize memory to 0.

Reported-and-tested-by: syzbot+01ade7...@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <ead...@qq.com>
---
fs/hfsplus/xattr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index 9c9ff6b8c6f7..858029b1c173 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -698,7 +698,7 @@ ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
return err;
}

- strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
+ strbuf = kzalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
if (!strbuf) {
res = -ENOMEM;

--
2.43.0