This is a note to let you know that I've just added the patch titled
block/compat_ioctl: fix range check in BLKGETSIZE
to the 4.19-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:
block-compat_ioctl-fix-range-check-in-blkgetsize.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ccf16413e520164eb718cf8b22a30438da80ff23 Mon Sep 17 00:00:00 2001
From: Khazhismel Kumykov <khazhy@xxxxxxxxxx>
Date: Thu, 14 Apr 2022 15:40:56 -0700
Subject: block/compat_ioctl: fix range check in BLKGETSIZE
From: Khazhismel Kumykov <khazhy@xxxxxxxxxx>
commit ccf16413e520164eb718cf8b22a30438da80ff23 upstream.
kernel ulong and compat_ulong_t may not be same width. Use type directly
to eliminate mismatches.
This would result in truncation rather than EFBIG for 32bit mode for
large disks.
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Khazhismel Kumykov <khazhy@xxxxxxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220414224056.2875681-1-khazhy@xxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/compat_ioctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -391,7 +391,7 @@ long compat_blkdev_ioctl(struct file *fi
return 0;
case BLKGETSIZE:
size = i_size_read(bdev->bd_inode);
- if ((size >> 9) > ~0UL)
+ if ((size >> 9) > ~(compat_ulong_t)0)
return -EFBIG;
return compat_put_ulong(arg, size >> 9);
Patches currently in stable-queue which might be from khazhy@xxxxxxxxxx are
queue-4.19/block-compat_ioctl-fix-range-check-in-blkgetsize.patch
