FAILED: patch "[PATCH] vc_screen: reload vc pointer before if (ret) in vcs_write()" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-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 <[email protected]>.

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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 226bd5603371cd9f6642cbb9e9a677f445de3530
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026100454-caloric-pried-9341@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 226bd5603371cd9f6642cbb9e9a677f445de3530 Mon Sep 17 00:00:00 2001
From: Yi Yang <[email protected]>
Date: Tue, 1 Sep 2026 11:31:31 +0000
Subject: [PATCH] vc_screen: reload vc pointer before if (ret) in vcs_write()
to avoid UAF

The reload of 'vc' added by commit 8fb9ea65c9d1 ("vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF") sits after the 'if (ret)' block, so the copy-failure break path exits the loop without reloading vc. If the vc was kfree()'d via vc_port_destruct during the unlocked copy_from_user() window, the post-loop
'if (written && vc) vcs_scr_updated(vc)' is reached with a stale non-NULL vc. The '&& vc' guard from commit a287620312dc ("vc_screen:
fix null-ptr-deref in vcs_notifier() during concurrent vcs_write") only handles the NULL case, not this stale-non-NULL case; vcs_notifier() then reads param->vc->vc_num from freed memory:

  BUG: KASAN: slab-use-after-free in vcs_notifier+0x7c/0xd0
  Read of size 2 at addr ffff888007149190
  Call Trace:
   vcs_notifier+0x7c/0xd0
   atomic_notifier_call_chain+0x70/0xa0
   vcs_scr_updated+0x77/0xa0
   vcs_write+0x71b/0x7e0
  Allocated by task: vc_allocate -> con_install -> tty_open
  Freed by task: kfree <- vt_ioctl (VT_DISALLOCATE -> vc_port_destruct)

Move the reload to immediately after console_lock(), before 'if (ret)', so every break path below passes a fresh vc to the post-loop vcs_scr_updated().

index bf1502fd5bd4..79453abcf4d9 100644
@@ -631,6 +631,18 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 		ret = copy_from_user(con_buf, buf, this_round);
 		console_lock();
 
+		/* The vc might have been freed or vcs_size might have changed
+		 * while we slept to grab the user buffer; recheck here, before
+		 * if (ret), so every break path below passes a fresh vc to the
+		 * post-loop vcs_scr_updated(). Return data written so far.
+		 */
+		vc = vcs_vc(inode, &viewed);
+		if (!vc) {
+			if (written)
+				break;
+			return -ENXIO;
+		}
+
 		if (ret) {
 			this_round -= ret;
 			if (!this_round) {

@@ -642,17 +654,6 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 				return -EFAULT;
 			}
 		}
-
-		/* The vc might have been freed or vcs_size might have changed
-		 * while we slept to grab the user buffer, so recheck.
-		 * Return data written up to now on failure.
-		 */
-		vc = vcs_vc(inode, &viewed);
-		if (!vc) {
-			if (written)
-				break;
-			return -ENXIO;
-		}
 		size = vcs_size(vc, attr, false);
 		if (size < 0) {
 			if (written)

From: Yi Yang <[email protected]>

[ Upstream commit 226bd5603371cd9f6642cbb9e9a677f445de3530 ]

The reload of 'vc' added by commit 8fb9ea65c9d1 ("vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF") sits after the 'if (ret)' block, so the copy-failure break path exits the loop without reloading vc. If the vc was kfree()'d via vc_port_destruct during the unlocked copy_from_user() window, the post-loop
'if (written && vc) vcs_scr_updated(vc)' is reached with a stale non-NULL vc. The '&& vc' guard from commit a287620312dc ("vc_screen:
fix null-ptr-deref in vcs_notifier() during concurrent vcs_write") only handles the NULL case, not this stale-non-NULL case; vcs_notifier() then reads param->vc->vc_num from freed memory:

  BUG: KASAN: slab-use-after-free in vcs_notifier+0x7c/0xd0
  Read of size 2 at addr ffff888007149190
  Call Trace:
   vcs_notifier+0x7c/0xd0
   atomic_notifier_call_chain+0x70/0xa0
   vcs_scr_updated+0x77/0xa0
   vcs_write+0x71b/0x7e0
  Allocated by task: vc_allocate -> con_install -> tty_open
  Freed by task: kfree <- vt_ioctl (VT_DISALLOCATE -> vc_port_destruct)

Move the reload to immediately after console_lock(), before 'if (ret)', so every break path below passes a fresh vc to the post-loop vcs_scr_updated().

[ sashal: REDUCED BACKPORT of 226bd5603371: carries 21/23 upstream
changed lines; not carried: drivers/tty/vt/vc_screen.c:vcs_write() (partly) ]

---
 drivers/tty/vt/vc_screen.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

index 5c417b6426bbf..a7b3fac5304d4 100644
@@ -643,6 +643,19 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 		ret = copy_from_user(con_buf, buf, this_round);
 		console_lock();
 
+		/* The vc might have been freed or vcs_size might have changed
+		 * while we slept to grab the user buffer; recheck here, before
+		 * if (ret), so every break path below passes a fresh vc to the
+		 * post-loop vcs_scr_updated(). Return data written so far.
+		 */
+		vc = vcs_vc(inode, &viewed);
+		if (!vc) {
+			if (written)
+				break;
+			ret = -ENXIO;
+			goto unlock_out;
+		}
+
 		if (ret) {
 			this_round -= ret;
 			if (!this_round) {

@@ -655,18 +668,6 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 				goto unlock_out;
 			}
 		}
-
-		/* The vc might have been freed or vcs_size might have changed
-		 * while we slept to grab the user buffer, so recheck.
-		 * Return data written up to now on failure.
-		 */
-		vc = vcs_vc(inode, &viewed);
-		if (!vc) {
-			if (written)
-				break;
-			ret = -ENXIO;
-			goto unlock_out;
-		}
 		size = vcs_size(vc, attr, false);
 		if (size < 0) {
 			if (written)

2.53.0