* [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user
@ 2021-01-12 8:19 Christoph Hellwig
2021-01-16 4:11 ` Al Viro
0 siblings, 1 reply; 5+ messages in thread
From: Christoph Hellwig @ 2021-01-12 8:19 UTC (permalink / raw)
To: viro; +Cc: linux-kernel, linux-fsdevel, David Laight
sizeof needs to be called on the compat pointer, not the native one.
Fixes: 89cd35c58bc2 ("iov_iter: transparently handle compat iovecs in import_iovec")
Reported-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
lib/iov_iter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 1635111c5bd2af..a21e6a5792c5a5 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1658,7 +1658,7 @@ static int copy_compat_iovec_from_user(struct iovec *iov,
(const struct compat_iovec __user *)uvec;
int ret = -EFAULT, i;
- if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
+ if (!user_access_begin(uiov, nr_segs * sizeof(*uiov)))
return -EFAULT;
for (i = 0; i < nr_segs; i++) {
--
2.29.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user
2021-01-12 8:19 [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user Christoph Hellwig
@ 2021-01-16 4:11 ` Al Viro
0 siblings, 0 replies; 5+ messages in thread
From: Al Viro @ 2021-01-16 4:11 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: linux-kernel, linux-fsdevel, David Laight
On Tue, Jan 12, 2021 at 09:19:05AM +0100, Christoph Hellwig wrote:
> sizeof needs to be called on the compat pointer, not the native one.
in #fixes and #for-next now...
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user
2021-01-11 17:19 Christoph Hellwig
2021-01-11 17:50 ` Al Viro
@ 2021-01-11 20:38 ` David Laight
1 sibling, 0 replies; 5+ messages in thread
From: David Laight @ 2021-01-11 20:38 UTC (permalink / raw)
To: 'Christoph Hellwig', viro; +Cc: linux-kernel, linux-fsdevel
From: Christoph Hellwig
> Sent: 11 January 2021 17:19
>
> sizeof needs to be called on the compat pointer, not the native one.
>
> Fixes: 89cd35c58bc2 ("iov_iter: transparently handle compat iovecs in import_iovec")
> Reported-by: David Laight <David.Laight@ACULAB.COM>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> lib/iov_iter.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/iov_iter.c b/lib/iov_iter.c
> index 1635111c5bd2af..586215aa0f15ce 100644
> --- a/lib/iov_iter.c
> +++ b/lib/iov_iter.c
> @@ -1658,7 +1658,7 @@ static int copy_compat_iovec_from_user(struct iovec *iov,
> (const struct compat_iovec __user *)uvec;
> int ret = -EFAULT, i;
>
> - if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
> + if (!user_access_begin(uvec, nr_segs * sizeof(*uiov)))
The first 'uvec' probably ought to be changed as well.
Even though both variables have the same value.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user
2021-01-11 17:19 Christoph Hellwig
@ 2021-01-11 17:50 ` Al Viro
2021-01-11 20:38 ` David Laight
1 sibling, 0 replies; 5+ messages in thread
From: Al Viro @ 2021-01-11 17:50 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: linux-kernel, linux-fsdevel, David Laight
On Mon, Jan 11, 2021 at 06:19:26PM +0100, Christoph Hellwig wrote:
> sizeof needs to be called on the compat pointer, not the native one.
>
> Fixes: 89cd35c58bc2 ("iov_iter: transparently handle compat iovecs in import_iovec")
> Reported-by: David Laight <David.Laight@ACULAB.COM>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Applied.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user
@ 2021-01-11 17:19 Christoph Hellwig
2021-01-11 17:50 ` Al Viro
2021-01-11 20:38 ` David Laight
0 siblings, 2 replies; 5+ messages in thread
From: Christoph Hellwig @ 2021-01-11 17:19 UTC (permalink / raw)
To: viro; +Cc: linux-kernel, linux-fsdevel, David Laight
sizeof needs to be called on the compat pointer, not the native one.
Fixes: 89cd35c58bc2 ("iov_iter: transparently handle compat iovecs in import_iovec")
Reported-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
lib/iov_iter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 1635111c5bd2af..586215aa0f15ce 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1658,7 +1658,7 @@ static int copy_compat_iovec_from_user(struct iovec *iov,
(const struct compat_iovec __user *)uvec;
int ret = -EFAULT, i;
- if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
+ if (!user_access_begin(uvec, nr_segs * sizeof(*uiov)))
return -EFAULT;
for (i = 0; i < nr_segs; i++) {
--
2.29.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
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2021-01-12 8:19 [PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user Christoph Hellwig
2021-01-16 4:11 ` Al Viro
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2021-01-11 17:19 Christoph Hellwig
2021-01-11 17:50 ` Al Viro
2021-01-11 20:38 ` David Laight
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