The patch below does not apply to the 5.4-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 <stable(a)vger.kernel.org>.
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-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '167819226210440(a)kroah.com' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
8eb29c4fbf96 ("dm flakey: fix a bug with 32-bit highmem systems")
f50714b57aec ("dm flakey: don't corrupt the zero page")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:03:31 -0500
Subject: [PATCH] dm flakey: fix a bug with 32-bit highmem systems
The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.
Cc: stable(a)vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index ff9ca5b2a47e..33608d436cec 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
struct page *page = bio_iter_page(bio, iter);
if (unlikely(page == ZERO_PAGE(0)))
break;
- segment = (page_address(page) + bio_iter_offset(bio, iter));
+ segment = bvec_kmap_local(&bvec);
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
+ kunmap_local(segment);
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
The patch below does not apply to the 5.10-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 <stable(a)vger.kernel.org>.
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-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '167819226214734(a)kroah.com' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
8eb29c4fbf96 ("dm flakey: fix a bug with 32-bit highmem systems")
f50714b57aec ("dm flakey: don't corrupt the zero page")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:03:31 -0500
Subject: [PATCH] dm flakey: fix a bug with 32-bit highmem systems
The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.
Cc: stable(a)vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index ff9ca5b2a47e..33608d436cec 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
struct page *page = bio_iter_page(bio, iter);
if (unlikely(page == ZERO_PAGE(0)))
break;
- segment = (page_address(page) + bio_iter_offset(bio, iter));
+ segment = bvec_kmap_local(&bvec);
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
+ kunmap_local(segment);
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
The patch below does not apply to the 4.19-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 <stable(a)vger.kernel.org>.
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-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '1678192261241235(a)kroah.com' --subject-prefix 'PATCH 4.19.y' HEAD^..
Possible dependencies:
8eb29c4fbf96 ("dm flakey: fix a bug with 32-bit highmem systems")
f50714b57aec ("dm flakey: don't corrupt the zero page")
a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:03:31 -0500
Subject: [PATCH] dm flakey: fix a bug with 32-bit highmem systems
The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.
Cc: stable(a)vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index ff9ca5b2a47e..33608d436cec 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
struct page *page = bio_iter_page(bio, iter);
if (unlikely(page == ZERO_PAGE(0)))
break;
- segment = (page_address(page) + bio_iter_offset(bio, iter));
+ segment = bvec_kmap_local(&bvec);
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
+ kunmap_local(segment);
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
The patch below does not apply to the 4.14-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 <stable(a)vger.kernel.org>.
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-4.14.y
git checkout FETCH_HEAD
git cherry-pick -x 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '167819226054249(a)kroah.com' --subject-prefix 'PATCH 4.14.y' HEAD^..
Possible dependencies:
8eb29c4fbf96 ("dm flakey: fix a bug with 32-bit highmem systems")
f50714b57aec ("dm flakey: don't corrupt the zero page")
a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:03:31 -0500
Subject: [PATCH] dm flakey: fix a bug with 32-bit highmem systems
The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.
Cc: stable(a)vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index ff9ca5b2a47e..33608d436cec 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
struct page *page = bio_iter_page(bio, iter);
if (unlikely(page == ZERO_PAGE(0)))
break;
- segment = (page_address(page) + bio_iter_offset(bio, iter));
+ segment = bvec_kmap_local(&bvec);
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
+ kunmap_local(segment);
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
The patch below does not apply to the 5.10-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 <stable(a)vger.kernel.org>.
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-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x f50714b57aecb6b3dc81d578e295f86d9c73f078
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '1678192217253116(a)kroah.com' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
f50714b57aec ("dm flakey: don't corrupt the zero page")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From f50714b57aecb6b3dc81d578e295f86d9c73f078 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:02:57 -0500
Subject: [PATCH] dm flakey: don't corrupt the zero page
When we need to zero some range on a block device, the function
__blkdev_issue_zero_pages submits a write bio with the bio vector pointing
to the zero page. If we use dm-flakey with corrupt bio writes option, it
will corrupt the content of the zero page which results in crashes of
various userspace programs. Glibc assumes that memory returned by mmap is
zeroed and it uses it for calloc implementation; if the newly mapped
memory is not zeroed, calloc will return non-zeroed memory.
Fix this bug by testing if the page is equal to ZERO_PAGE(0) and
avoiding the corruption in this case.
Cc: stable(a)vger.kernel.org
Fixes: a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.")
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 89fa7a68c6c4..ff9ca5b2a47e 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -303,8 +303,11 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
*/
bio_for_each_segment(bvec, bio, iter) {
if (bio_iter_len(bio, iter) > corrupt_bio_byte) {
- char *segment = (page_address(bio_iter_page(bio, iter))
- + bio_iter_offset(bio, iter));
+ char *segment;
+ struct page *page = bio_iter_page(bio, iter);
+ if (unlikely(page == ZERO_PAGE(0)))
+ break;
+ segment = (page_address(page) + bio_iter_offset(bio, iter));
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
The patch below does not apply to the 5.4-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 <stable(a)vger.kernel.org>.
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-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x f50714b57aecb6b3dc81d578e295f86d9c73f078
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '167819221615494(a)kroah.com' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
f50714b57aec ("dm flakey: don't corrupt the zero page")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From f50714b57aecb6b3dc81d578e295f86d9c73f078 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:02:57 -0500
Subject: [PATCH] dm flakey: don't corrupt the zero page
When we need to zero some range on a block device, the function
__blkdev_issue_zero_pages submits a write bio with the bio vector pointing
to the zero page. If we use dm-flakey with corrupt bio writes option, it
will corrupt the content of the zero page which results in crashes of
various userspace programs. Glibc assumes that memory returned by mmap is
zeroed and it uses it for calloc implementation; if the newly mapped
memory is not zeroed, calloc will return non-zeroed memory.
Fix this bug by testing if the page is equal to ZERO_PAGE(0) and
avoiding the corruption in this case.
Cc: stable(a)vger.kernel.org
Fixes: a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.")
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 89fa7a68c6c4..ff9ca5b2a47e 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -303,8 +303,11 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
*/
bio_for_each_segment(bvec, bio, iter) {
if (bio_iter_len(bio, iter) > corrupt_bio_byte) {
- char *segment = (page_address(bio_iter_page(bio, iter))
- + bio_iter_offset(bio, iter));
+ char *segment;
+ struct page *page = bio_iter_page(bio, iter);
+ if (unlikely(page == ZERO_PAGE(0)))
+ break;
+ segment = (page_address(page) + bio_iter_offset(bio, iter));
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
The patch below does not apply to the 4.19-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 <stable(a)vger.kernel.org>.
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-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x f50714b57aecb6b3dc81d578e295f86d9c73f078
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '1678192215115168(a)kroah.com' --subject-prefix 'PATCH 4.19.y' HEAD^..
Possible dependencies:
f50714b57aec ("dm flakey: don't corrupt the zero page")
a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From f50714b57aecb6b3dc81d578e295f86d9c73f078 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka(a)redhat.com>
Date: Sun, 22 Jan 2023 14:02:57 -0500
Subject: [PATCH] dm flakey: don't corrupt the zero page
When we need to zero some range on a block device, the function
__blkdev_issue_zero_pages submits a write bio with the bio vector pointing
to the zero page. If we use dm-flakey with corrupt bio writes option, it
will corrupt the content of the zero page which results in crashes of
various userspace programs. Glibc assumes that memory returned by mmap is
zeroed and it uses it for calloc implementation; if the newly mapped
memory is not zeroed, calloc will return non-zeroed memory.
Fix this bug by testing if the page is equal to ZERO_PAGE(0) and
avoiding the corruption in this case.
Cc: stable(a)vger.kernel.org
Fixes: a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.")
Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel(a)dorminy.me>
Signed-off-by: Mike Snitzer <snitzer(a)kernel.org>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 89fa7a68c6c4..ff9ca5b2a47e 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -303,8 +303,11 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
*/
bio_for_each_segment(bvec, bio, iter) {
if (bio_iter_len(bio, iter) > corrupt_bio_byte) {
- char *segment = (page_address(bio_iter_page(bio, iter))
- + bio_iter_offset(bio, iter));
+ char *segment;
+ struct page *page = bio_iter_page(bio, iter);
+ if (unlikely(page == ZERO_PAGE(0)))
+ break;
+ segment = (page_address(page) + bio_iter_offset(bio, iter));
segment[corrupt_bio_byte] = fc->corrupt_bio_value;
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",