* FAILED: patch "[PATCH] smb: client: fix OOB in smb2_query_reparse_point()" failed to apply to 5.10-stable tree
@ 2023-12-18 7:21 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2023-12-18 7:21 UTC (permalink / raw)
To: pc, rtm, stfrench; +Cc: stable
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 3a42709fa909e22b0be4bb1e2795aa04ada732a3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023121802-manhandle-dynamite-db21@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
3a42709fa909 ("smb: client: fix OOB in smb2_query_reparse_point()")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 3a42709fa909e22b0be4bb1e2795aa04ada732a3 Mon Sep 17 00:00:00 2001
From: Paulo Alcantara <pc@manguebit.com>
Date: Mon, 11 Dec 2023 10:26:43 -0300
Subject: [PATCH] smb: client: fix OOB in smb2_query_reparse_point()
Validate @ioctl_rsp->OutputOffset and @ioctl_rsp->OutputCount so that
their sum does not wrap to a number that is smaller than @reparse_buf
and we end up with a wild pointer as follows:
BUG: unable to handle page fault for address: ffff88809c5cd45f
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 4a01067 P4D 4a01067 PUD 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 2 PID: 1260 Comm: mount.cifs Not tainted 6.7.0-rc4 #2
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014
RIP: 0010:smb2_query_reparse_point+0x3e0/0x4c0 [cifs]
Code: ff ff e8 f3 51 fe ff 41 89 c6 58 5a 45 85 f6 0f 85 14 fe ff ff
49 8b 57 48 8b 42 60 44 8b 42 64 42 8d 0c 00 49 39 4f 50 72 40 <8b>
04 02 48 8b 9d f0 fe ff ff 49 8b 57 50 89 03 48 8b 9d e8 fe ff
RSP: 0018:ffffc90000347a90 EFLAGS: 00010212
RAX: 000000008000001f RBX: ffff88800ae11000 RCX: 00000000000000ec
RDX: ffff88801c5cd440 RSI: 0000000000000000 RDI: ffffffff82004aa4
RBP: ffffc90000347bb0 R08: 00000000800000cd R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000024 R12: ffff8880114d4100
R13: ffff8880114d4198 R14: 0000000000000000 R15: ffff8880114d4000
FS: 00007f02c07babc0(0000) GS:ffff88806ba00000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88809c5cd45f CR3: 0000000011750000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<TASK>
? __die+0x23/0x70
? page_fault_oops+0x181/0x480
? search_module_extables+0x19/0x60
? srso_alias_return_thunk+0x5/0xfbef5
? exc_page_fault+0x1b6/0x1c0
? asm_exc_page_fault+0x26/0x30
? _raw_spin_unlock_irqrestore+0x44/0x60
? smb2_query_reparse_point+0x3e0/0x4c0 [cifs]
cifs_get_fattr+0x16e/0xa50 [cifs]
? srso_alias_return_thunk+0x5/0xfbef5
? lock_acquire+0xbf/0x2b0
cifs_root_iget+0x163/0x5f0 [cifs]
cifs_smb3_do_mount+0x5bd/0x780 [cifs]
smb3_get_tree+0xd9/0x290 [cifs]
vfs_get_tree+0x2c/0x100
? capable+0x37/0x70
path_mount+0x2d7/0xb80
? srso_alias_return_thunk+0x5/0xfbef5
? _raw_spin_unlock_irqrestore+0x44/0x60
__x64_sys_mount+0x11a/0x150
do_syscall_64+0x47/0xf0
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f02c08d5b1e
Fixes: 2e4564b31b64 ("smb3: add support for stat of WSL reparse points for special file types")
Cc: stable@vger.kernel.org
Reported-by: Robert Morris <rtm@csail.mit.edu>
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index a6f4948adcbb..8f6f0a38b886 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -3003,7 +3003,7 @@ static int smb2_query_reparse_point(const unsigned int xid,
struct kvec *rsp_iov;
struct smb2_ioctl_rsp *ioctl_rsp;
struct reparse_data_buffer *reparse_buf;
- u32 plen;
+ u32 off, count, len;
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
@@ -3084,16 +3084,22 @@ static int smb2_query_reparse_point(const unsigned int xid,
*/
if (rc == 0) {
/* See MS-FSCC 2.3.23 */
+ off = le32_to_cpu(ioctl_rsp->OutputOffset);
+ count = le32_to_cpu(ioctl_rsp->OutputCount);
+ if (check_add_overflow(off, count, &len) ||
+ len > rsp_iov[1].iov_len) {
+ cifs_tcon_dbg(VFS, "%s: invalid ioctl: off=%d count=%d\n",
+ __func__, off, count);
+ rc = -EIO;
+ goto query_rp_exit;
+ }
- reparse_buf = (struct reparse_data_buffer *)
- ((char *)ioctl_rsp +
- le32_to_cpu(ioctl_rsp->OutputOffset));
- plen = le32_to_cpu(ioctl_rsp->OutputCount);
-
- if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
- rsp_iov[1].iov_len) {
- cifs_tcon_dbg(FYI, "srv returned invalid ioctl len: %d\n",
- plen);
+ reparse_buf = (void *)((u8 *)ioctl_rsp + off);
+ len = sizeof(*reparse_buf);
+ if (count < len ||
+ count < le16_to_cpu(reparse_buf->ReparseDataLength) + len) {
+ cifs_tcon_dbg(VFS, "%s: invalid ioctl: off=%d count=%d\n",
+ __func__, off, count);
rc = -EIO;
goto query_rp_exit;
}
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2023-12-18 7:21 FAILED: patch "[PATCH] smb: client: fix OOB in smb2_query_reparse_point()" failed to apply to 5.10-stable tree gregkh
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