Li Nan (2): Revert "md/raid10: fix slab-out-of-bounds in md_bitmap_get_counter" md/raid10: check slab-out-of-bounds in md_bitmap_get_counter
Yu Kuai (1): md: fix resync softlockup when bitmap size is less than array size
drivers/md/md-bitmap.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-)
hulk inclusion category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SH1 CVE: CVE-2024-38598
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This reverts commit fd9876bb0ad928b3b92321aaf792d5c6ce13c1e7. Revert hulk inclusion. Backport 5.10-lts version.
Signed-off-by: Li Nan linan122@huawei.com --- drivers/md/md-bitmap.c | 3 --- 1 file changed, 3 deletions(-)
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index 8649c7b5f2b8..0b006e777368 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -1408,9 +1408,6 @@ __acquires(bitmap->lock) sector_t csize; int err;
- if (page >= bitmap->pages) - return NULL; - err = md_bitmap_checkpage(bitmap, page, create, 0);
if (bitmap->bp[page].hijacked ||
stable inclusion from stable-v5.10.188 commit 39fa14e824acfd470db4f42c354297456bd82b53 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SH1 CVE: CVE-2024-38598
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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[ Upstream commit 301867b1c16805aebbc306aafa6ecdc68b73c7e5 ]
If we write a large number to md/bitmap_set_bits, md_bitmap_checkpage() will return -EINVAL because 'page >= bitmap->pages', but the return value was not checked immediately in md_bitmap_get_counter() in order to set *blocks value and slab-out-of-bounds occurs.
Move check of 'page >= bitmap->pages' to md_bitmap_get_counter() and return directly if true.
Fixes: ef4256733506 ("md/bitmap: optimise scanning of empty bitmaps.") Signed-off-by: Li Nan linan122@huawei.com Reviewed-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Song Liu song@kernel.org Link: https://lore.kernel.org/r/20230515134808.3936750-2-linan666@huaweicloud.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/md-bitmap.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index 0b006e777368..aef52e11c24f 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -54,14 +54,7 @@ __acquires(bitmap->lock) { unsigned char *mappage;
- if (page >= bitmap->pages) { - /* This can happen if bitmap_start_sync goes beyond - * End-of-device while looking for a whole page. - * It is harmless. - */ - return -EINVAL; - } - + WARN_ON_ONCE(page >= bitmap->pages); if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ return 0;
@@ -1408,6 +1401,14 @@ __acquires(bitmap->lock) sector_t csize; int err;
+ if (page >= bitmap->pages) { + /* + * This can happen if bitmap_start_sync goes beyond + * End-of-device while looking for a whole page or + * user set a huge number to sysfs bitmap_set_bits. + */ + return NULL; + } err = md_bitmap_checkpage(bitmap, page, create, 0);
if (bitmap->bp[page].hijacked ||
From: Yu Kuai yukuai3@huawei.com
mainline inclusion from mainline-v6.10-rc1 commit f0e729af2eb6bee9eb58c4df1087f14ebaefe26b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SH1 CVE: CVE-2024-38598
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Is is reported that for dm-raid10, lvextend + lvchange --syncaction will trigger following softlockup:
kernel:watchdog: BUG: soft lockup - CPU#3 stuck for 26s! [mdX_resync:6976] CPU: 7 PID: 3588 Comm: mdX_resync Kdump: loaded Not tainted 6.9.0-rc4-next-20240419 #1 RIP: 0010:_raw_spin_unlock_irq+0x13/0x30 Call Trace: <TASK> md_bitmap_start_sync+0x6b/0xf0 raid10_sync_request+0x25c/0x1b40 [raid10] md_do_sync+0x64b/0x1020 md_thread+0xa7/0x170 kthread+0xcf/0x100 ret_from_fork+0x30/0x50 ret_from_fork_asm+0x1a/0x30
And the detailed process is as follows:
md_do_sync j = mddev->resync_min while (j < max_sectors) sectors = raid10_sync_request(mddev, j, &skipped) if (!md_bitmap_start_sync(..., &sync_blocks)) // md_bitmap_start_sync set sync_blocks to 0 return sync_blocks + sectors_skippe; // sectors = 0; j += sectors; // j never change
Root cause is that commit 301867b1c168 ("md/raid10: check slab-out-of-bounds in md_bitmap_get_counter") return early from md_bitmap_get_counter(), without setting returned blocks.
Fix this problem by always set returned blocks from md_bitmap_get_counter"(), as it used to be.
Noted that this patch just fix the softlockup problem in kernel, the case that bitmap size doesn't match array size still need to be fixed.
Fixes: 301867b1c168 ("md/raid10: check slab-out-of-bounds in md_bitmap_get_counter") Reported-and-tested-by: Nigel Croxon ncroxon@redhat.com Closes: https://lore.kernel.org/all/71ba5272-ab07-43ba-8232-d2da642acb4e@redhat.com/ Signed-off-by: Yu Kuai yukuai3@huawei.com Link: https://lore.kernel.org/r/20240422065824.2516-1-yukuai1@huaweicloud.com Signed-off-by: Song Liu song@kernel.org Signed-off-by: Li Nan linan122@huawei.com --- drivers/md/md-bitmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index aef52e11c24f..99ca9251f502 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -1398,7 +1398,7 @@ __acquires(bitmap->lock) sector_t chunk = offset >> bitmap->chunkshift; unsigned long page = chunk >> PAGE_COUNTER_SHIFT; unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; - sector_t csize; + sector_t csize = ((sector_t)1) << bitmap->chunkshift; int err;
if (page >= bitmap->pages) { @@ -1407,6 +1407,7 @@ __acquires(bitmap->lock) * End-of-device while looking for a whole page or * user set a huge number to sysfs bitmap_set_bits. */ + *blocks = csize - (offset & (csize - 1)); return NULL; } err = md_bitmap_checkpage(bitmap, page, create, 0); @@ -1415,8 +1416,7 @@ __acquires(bitmap->lock) bitmap->bp[page].map == NULL) csize = ((sector_t)1) << (bitmap->chunkshift + PAGE_COUNTER_SHIFT); - else - csize = ((sector_t)1) << bitmap->chunkshift; + *blocks = csize - (offset & (csize - 1));
if (err < 0)
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