From 7c11d0ae439565b4560b0c0f36bf05171ed1a146 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Mon, 26 Jul 2021 14:35:03 +0800 Subject: [PATCH] btrfs: subpage: fix a potential use-after-free in writeback helper [BUG] There is a possible use-after-free bug when running generic/095. BUG: Unable to handle kernel data access on write at 0x6b6b6b6b6b6b725b Faulting instruction address: 0xc000000000283654 c000000000283078 do_raw_spin_unlock+0x88/0x230 c0000000012b1e14 _raw_spin_unlock_irqrestore+0x44/0x90 c000000000a918dc btrfs_subpage_clear_writeback+0xac/0xe0 c0000000009e0458 end_bio_extent_writepage+0x158/0x270 c000000000b6fd14 bio_endio+0x254/0x270 c0000000009fc0f0 btrfs_end_bio+0x1a0/0x200 c000000000b6fd14 bio_endio+0x254/0x270 c000000000b781fc blk_update_request+0x46c/0x670 c000000000b8b394 blk_mq_end_request+0x34/0x1d0 c000000000d82d1c lo_complete_rq+0x11c/0x140 c000000000b880a4 blk_complete_reqs+0x84/0xb0 c0000000012b2ca4 __do_softirq+0x334/0x680 c0000000001dd878 irq_exit+0x148/0x1d0 c000000000016f4c do_IRQ+0x20c/0x240 c000000000009240 hardware_interrupt_common_virt+0x1b0/0x1c0 [CAUSE] There is very small race window like the following in generic/095. Thread 1 | Thread 2 --------------------------------+------------------------------------ end_bio_extent_writepage() | btrfs_releasepage() |- spin_lock_irqsave() | | |- end_page_writeback() | | | | |- if (PageWriteback() ||...) | | |- clear_page_extent_mapped() | | |- kfree(subpage); |- spin_unlock_irqrestore(). The race can also happen between writeback and btrfs_invalidatepage(), although that would be much harder as btrfs_invalidatepage() has much more work to do before the clear_page_extent_mapped() call. [FIX] Here we "wait" for the subapge spinlock to be released before we detach subpage structure. So this patch will introduce a new function, wait_subpage_spinlock(), to do the "wait" by acquiring the spinlock and release it. Since the caller has ensured the page is not dirty nor writeback, and page is already locked, the only way to hold the subpage spinlock is from endio function. Thus we only need to acquire the spinlock to wait for any existing holder. Reported-by: Ritesh Harjani Tested-by: Ritesh Harjani Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/file.c | 8 ++++---- fs/btrfs/inode.c | 39 ++++++++++++++++++++++++++++++++++++++- fs/btrfs/subpage.c | 4 +++- 3 files changed, 45 insertions(+), 6 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 8c57af3..d3f2623 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1343,10 +1343,10 @@ static int prepare_uptodate_page(struct inode *inode, /* * Since btrfs_readpage() will unlock the page before it - * returns, there is a window where btrfs_releasepage() can - * be called to release the page. - * Here we check both inode mapping and PagePrivate() to - * make sure the page was not released. + * returns, there is a window where btrfs_releasepage() can be + * called to release the page. Here we check both inode + * mapping and PagePrivate() to make sure the page was not + * released. * * The private flag check is essential for subpage as we need * to store extra bitmap using page->private. diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index cade9a2..034fe81 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -8426,11 +8426,47 @@ static void btrfs_readahead(struct readahead_control *rac) extent_readahead(rac); } +/* + * For releasepage() and invalidatepage() we have a race window where + * end_page_writeback() is called but the subpage spinlock is not yet released. + * If we continue to release/invalidate the page, we could cause use-after-free + * for subpage spinlock. So this function is to spin and wait for subpage + * spinlock. + */ +static void wait_subpage_spinlock(struct page *page) +{ + struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb); + struct btrfs_subpage *subpage; + + if (fs_info->sectorsize == PAGE_SIZE) + return; + + ASSERT(PagePrivate(page) && page->private); + subpage = (struct btrfs_subpage *)page->private; + + /* + * This may look insane as we just acquire the spinlock and release it, + * without doing anything. But we just want to make sure no one is + * still holding the subpage spinlock. + * And since the page is not dirty nor writeback, and we have page + * locked, the only possible way to hold a spinlock is from the endio + * function to clear page writeback. + * + * Here we just acquire the spinlock so that all existing callers + * should exit and we're safe to release/invalidate the page. + */ + spin_lock_irq(&subpage->lock); + spin_unlock_irq(&subpage->lock); +} + static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) { int ret = try_release_extent_mapping(page, gfp_flags); - if (ret == 1) + + if (ret == 1) { + wait_subpage_spinlock(page); clear_page_extent_mapped(page); + } return ret; } @@ -8494,6 +8530,7 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset, * do double ordered extent accounting on the same page. */ wait_on_page_writeback(page); + wait_subpage_spinlock(page); /* * For subpage case, we have call sites like diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c index 3c31184..cb10e56 100644 --- a/fs/btrfs/subpage.c +++ b/fs/btrfs/subpage.c @@ -435,8 +435,10 @@ void btrfs_subpage_clear_writeback(const struct btrfs_fs_info *fs_info, spin_lock_irqsave(&subpage->lock, flags); subpage->writeback_bitmap &= ~tmp; - if (subpage->writeback_bitmap == 0) + if (subpage->writeback_bitmap == 0) { + ASSERT(PageWriteback(page)); end_page_writeback(page); + } spin_unlock_irqrestore(&subpage->lock, flags); } -- 2.7.4