[PATCH] block/compat_ioctl: fix range check in BLKGETSIZE

[PATCH] block/compat_ioctl: fix range check in BLKGETSIZE

[Khazhismel Kumykov]

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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.

Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
---
 block/compat_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 6ca015f92766..3a2c77f07da8 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -388,7 +388,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 		return 0;
 	case BLKGETSIZE:
 		size = i_size_read(bdev->bd_inode);
-		if ((size >> 9) > ~0UL)
+		if ((size >> 9) > ~((compat_ulong_t)0UL))
 			return -EFBIG;
 		return compat_put_ulong(arg, size >> 9);
 
-- 
2.17.0.484.g0c8726318c-goog


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Re: [PATCH] block/compat_ioctl: fix range check in BLKGETSIZE

[Khazhismel Kumykov]

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Ping?

On Fri, Apr 6, 2018 at 3:23 PM, Khazhismel Kumykov <khazhy@google.com> wrote:
> 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.
>
> Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
> ---
>  block/compat_ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
> index 6ca015f92766..3a2c77f07da8 100644
> --- a/block/compat_ioctl.c
> +++ b/block/compat_ioctl.c
> @@ -388,7 +388,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
>                 return 0;
>         case BLKGETSIZE:
>                 size = i_size_read(bdev->bd_inode);
> -               if ((size >> 9) > ~0UL)
> +               if ((size >> 9) > ~((compat_ulong_t)0UL))
>                         return -EFBIG;
>                 return compat_put_ulong(arg, size >> 9);
>
> --
> 2.17.0.484.g0c8726318c-goog
>

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Re: [PATCH] block/compat_ioctl: fix range check in BLKGETSIZE

[Jens Axboe]

On 4/6/18 4:23 PM, Khazhismel Kumykov wrote:
> 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.

Sorry for not getting to this. Applied, thanks.

-- 
Jens Axboe

[PATCH] block/compat_ioctl: fix range check in BLKGETSIZE

[Khazhismel Kumykov]

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.

Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
---
 block/ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Noticed this one was sitting in my "not landed yet" pile, third time's
the charm? :)

diff --git a/block/ioctl.c b/block/ioctl.c
index 4a86340133e4..959e93a90b29 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -629,7 +629,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 		return compat_put_long(argp,
 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
 	case BLKGETSIZE:
-		if (bdev_nr_sectors(bdev) > ~0UL)
+		if (bdev_nr_sectors(bdev) > ~((compat_ulong_t)0UL))
 			return -EFBIG;
 		return compat_put_ulong(argp, bdev_nr_sectors(bdev));
 
-- 
2.35.1.1178.g4f1659d476-goog

Re: [PATCH] block/compat_ioctl: fix range check in BLKGETSIZE

[Bart Van Assche]

On 4/8/22 16:47, Khazhismel Kumykov wrote:
> 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.
> 
> Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
> ---
>   block/ioctl.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Noticed this one was sitting in my "not landed yet" pile, third time's
> the charm? :)
> 
> diff --git a/block/ioctl.c b/block/ioctl.c
> index 4a86340133e4..959e93a90b29 100644
> --- a/block/ioctl.c
> +++ b/block/ioctl.c
> @@ -629,7 +629,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
>   		return compat_put_long(argp,
>   			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
>   	case BLKGETSIZE:
> -		if (bdev_nr_sectors(bdev) > ~0UL)
> +		if (bdev_nr_sectors(bdev) > ~((compat_ulong_t)0UL))
>   			return -EFBIG;
>   		return compat_put_ulong(argp, bdev_nr_sectors(bdev));

A nit: the "UL" and two parentheses can be left out. Anyway:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>