* [PATCH 4.19 0/1] block-map: backport fix for CVE-2022-0494
@ 2022-06-02 14:49 Dragos-Marian Panait
2022-06-02 14:49 ` [PATCH 4.19 1/1] block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern Dragos-Marian Panait
0 siblings, 1 reply; 2+ messages in thread
From: Dragos-Marian Panait @ 2022-06-02 14:49 UTC (permalink / raw)
To: stable
Cc: Haimin Zhang, Chaitanya Kulkarni, Christoph Hellwig, Jens Axboe,
linux-block, linux-kernel, Greg Kroah-Hartman
The following commit is needed to fix CVE-2022-0494:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc8f7fe1f5eab010191aa4570f27641876fa1267
Haimin Zhang (1):
block-map: add __GFP_ZERO flag for alloc_page in function
bio_copy_kern
block/bio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
base-commit: 06d93c33da2cc9c3ca79f5ba757e08306455d9d6
--
2.36.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH 4.19 1/1] block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern
2022-06-02 14:49 [PATCH 4.19 0/1] block-map: backport fix for CVE-2022-0494 Dragos-Marian Panait
@ 2022-06-02 14:49 ` Dragos-Marian Panait
0 siblings, 0 replies; 2+ messages in thread
From: Dragos-Marian Panait @ 2022-06-02 14:49 UTC (permalink / raw)
To: stable
Cc: Haimin Zhang, Chaitanya Kulkarni, Christoph Hellwig, Jens Axboe,
linux-block, linux-kernel, Greg Kroah-Hartman
From: Haimin Zhang <tcs.kernel@gmail.com>
commit cc8f7fe1f5eab010191aa4570f27641876fa1267 upstream.
Add __GFP_ZERO flag for alloc_page in function bio_copy_kern to initialize
the buffer of a bio.
Signed-off-by: Haimin Zhang <tcs.kernel@gmail.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220216084038.15635-1-tcs.kernel@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[DP: Backported to 4.19: Manually added __GFP_ZERO flag]
Signed-off-by: Dragos-Marian Panait <dragos.panait@windriver.com>
---
block/bio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/bio.c b/block/bio.c
index fe749404ef93..7858b2d23916 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1528,7 +1528,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
if (bytes > len)
bytes = len;
- page = alloc_page(q->bounce_gfp | gfp_mask);
+ page = alloc_page(q->bounce_gfp | __GFP_ZERO | gfp_mask);
if (!page)
goto cleanup;
--
2.36.1
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2022-06-02 14:49 [PATCH 4.19 0/1] block-map: backport fix for CVE-2022-0494 Dragos-Marian Panait
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