Patch "smb: client: fix use-after-free bug in cifs_debug_data_proc_show()" has been added to the 6.6-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a note to let you know that I've just added the patch titled

    smb: client: fix use-after-free bug in cifs_debug_data_proc_show()

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     smb-client-fix-use-after-free-bug-in-cifs_debug_data_proc_show.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From d328c09ee9f15ee5a26431f5aad7c9239fa85e62 Mon Sep 17 00:00:00 2001
From: Paulo Alcantara <pc@xxxxxxxxxxxxx>
Date: Tue, 24 Oct 2023 13:49:15 -0300
Subject: smb: client: fix use-after-free bug in cifs_debug_data_proc_show()

From: Paulo Alcantara <pc@xxxxxxxxxxxxx>

commit d328c09ee9f15ee5a26431f5aad7c9239fa85e62 upstream.

Skip SMB sessions that are being teared down
(e.g. @ses->ses_status == SES_EXITING) in cifs_debug_data_proc_show()
to avoid use-after-free in @ses.

This fixes the following GPF when reading from /proc/fs/cifs/DebugData
while mounting and umounting

  [ 816.251274] general protection fault, probably for non-canonical
  address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI
  ...
  [  816.260138] Call Trace:
  [  816.260329]  <TASK>
  [  816.260499]  ? die_addr+0x36/0x90
  [  816.260762]  ? exc_general_protection+0x1b3/0x410
  [  816.261126]  ? asm_exc_general_protection+0x26/0x30
  [  816.261502]  ? cifs_debug_tcon+0xbd/0x240 [cifs]
  [  816.261878]  ? cifs_debug_tcon+0xab/0x240 [cifs]
  [  816.262249]  cifs_debug_data_proc_show+0x516/0xdb0 [cifs]
  [  816.262689]  ? seq_read_iter+0x379/0x470
  [  816.262995]  seq_read_iter+0x118/0x470
  [  816.263291]  proc_reg_read_iter+0x53/0x90
  [  816.263596]  ? srso_alias_return_thunk+0x5/0x7f
  [  816.263945]  vfs_read+0x201/0x350
  [  816.264211]  ksys_read+0x75/0x100
  [  816.264472]  do_syscall_64+0x3f/0x90
  [  816.264750]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
  [  816.265135] RIP: 0033:0x7fd5e669d381

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Paulo Alcantara (SUSE) <pc@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/smb/client/cifs_debug.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/smb/client/cifs_debug.c
+++ b/fs/smb/client/cifs_debug.c
@@ -452,6 +452,11 @@ skip_rdma:
 		seq_printf(m, "\n\n\tSessions: ");
 		i = 0;
 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+			spin_lock(&ses->ses_lock);
+			if (ses->ses_status == SES_EXITING) {
+				spin_unlock(&ses->ses_lock);
+				continue;
+			}
 			i++;
 			if ((ses->serverDomain == NULL) ||
 				(ses->serverOS == NULL) ||
@@ -472,6 +477,7 @@ skip_rdma:
 				ses->ses_count, ses->serverOS, ses->serverNOS,
 				ses->capabilities, ses->ses_status);
 			}
+			spin_unlock(&ses->ses_lock);
 
 			seq_printf(m, "\n\tSecurity type: %s ",
 				get_security_type_str(server->ops->select_sectype(server, ses->sectype)));


Patches currently in stable-queue which might be from pc@xxxxxxxxxxxxx are

queue-6.6/cifs-spnego-add-in-host_key_len.patch
queue-6.6/cifs-reconnect-helper-should-set-reconnect-for-the-right-channel.patch
queue-6.6/smb3-fix-creating-fifos-when-mounting-with-sfu-mount-option.patch
queue-6.6/cifs-fix-check-of-rc-in-function-generate_smb3signin.patch
queue-6.6/smb-client-fix-use-after-free-bug-in-cifs_debug_data_proc_show.patch
queue-6.6/smb-client-fix-potential-deadlock-when-releasing-mids.patch
queue-6.6/smb-client-fix-use-after-free-in-smb2_query_info_compound.patch
queue-6.6/cifs-do-not-pass-cifs_sb-when-trying-to-add-channels.patch
queue-6.6/smb-client-fix-mount-when-dns_resolver-key-is-not-available.patch
queue-6.6/cifs-fix-encryption-of-cleared-but-unset-rq_iter-data-buffers.patch



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux