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@vger.kernel.org.

Possible dependencies:

f6b1a1cf1c3e ("ext4: fix use-after-free in ext4_ext_shift_extents") 1811bc401aa5 ("ext4: refresh the ext4_ext_path struct after dropping i_data_sem.") 4268496e48dc ("ext4: ensure enough credits in ext4_ext_shift_path_extents") 4756ee183f25 ("ext4: use true,false for bool variable") 83448bdfb597 ("ext4: Reserve revoke credits for freed blocks") fdc3ef882a5d ("jbd2: Reserve space for revoke descriptor blocks") ec8b6f600e49 ("jbd2: Factor out common parts of stopping and restarting a handle") 5559b2d81b51 ("jbd2: Drop pointless wakeup from jbd2_journal_stop()") dfaf5ffda227 ("jbd2: Reorganize jbd2_journal_stop()") a9a8344ee171 ("ext4, jbd2: Provide accessor function for handle credits") a413036791d0 ("ext4: Provide function to handle transaction restarts") 6cb367c2d1f8 ("ext4: Use ext4_journal_extend() instead of jbd2_journal_extend()") 538bcaa6261b ("jbd2: fix race when writing superblock") 32ea275008d8 ("jbd2: update locking documentation for transaction_t") fb265c9cb49e ("ext4: add ext4_sb_bread() to disambiguate ENOMEM cases") 53692ec074d0 ("ext4: fix buffer leak in ext4_expand_extra_isize_ea() on error path") 4f32c38b4662 ("ext4: avoid possible double brelse() in add_new_gdb() on error path") 0b02f4c0d6d9 ("ext4: fix reserved cluster accounting at delayed write time") 1dc0aa46e74a ("ext4: add new pending reservation mechanism") ad431025aecd ("ext4: generalize extents status tree search functions")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f6b1a1cf1c3ee430d3f5e47847047ce789a690aa Mon Sep 17 00:00:00 2001 From: Baokun Li libaokun1@huawei.com Date: Thu, 22 Sep 2022 20:04:34 +0800 Subject: [PATCH] ext4: fix use-after-free in ext4_ext_shift_extents MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

If the starting position of our insert range happens to be in the hole between the two ext4_extent_idx, because the lblk of the ext4_extent in the previous ext4_extent_idx is always less than the start, which leads to the "extent" variable access across the boundary, the following UAF is triggered: ================================================================== BUG: KASAN: use-after-free in ext4_ext_shift_extents+0x257/0x790 Read of size 4 at addr ffff88819807a008 by task fallocate/8010 CPU: 3 PID: 8010 Comm: fallocate Tainted: G E 5.10.0+ #492 Call Trace: dump_stack+0x7d/0xa3 print_address_description.constprop.0+0x1e/0x220 kasan_report.cold+0x67/0x7f ext4_ext_shift_extents+0x257/0x790 ext4_insert_range+0x5b6/0x700 ext4_fallocate+0x39e/0x3d0 vfs_fallocate+0x26f/0x470 ksys_fallocate+0x3a/0x70 __x64_sys_fallocate+0x4f/0x60 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ==================================================================

For right shifts, we can divide them into the following situations：

1. When the first ee_block of ext4_extent_idx is greater than or equal to start, make right shifts directly from the first ee_block. 1) If it is greater than start, we need to continue searching in the previous ext4_extent_idx. 2) If it is equal to start, we can exit the loop (iterator=NULL).

2. When the first ee_block of ext4_extent_idx is less than start, then traverse from the last extent to find the first extent whose ee_block is less than start. 1) If extent is still the last extent after traversal, it means that the last ee_block of ext4_extent_idx is less than start, that is, start is located in the hole between idx and (idx+1), so we can exit the loop directly (break) without right shifts. 2) Otherwise, make right shifts at the corresponding position of the found extent, and then exit the loop (iterator=NULL).

Fixes: 331573febb6a ("ext4: Add support FALLOC_FL_INSERT_RANGE for fallocate") Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Signed-off-by: Baokun Li libaokun1@huawei.com Link: https://lore.kernel.org/r/20220922120434.1294789-1-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index f1956288307f..6c399a8b22b3 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -5184,6 +5184,7 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle, * and it is decreased till we reach start. */ again: + ret = 0; if (SHIFT == SHIFT_LEFT) iterator = &start; else @@ -5227,14 +5228,21 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle, ext4_ext_get_actual_len(extent); } else { extent = EXT_FIRST_EXTENT(path[depth].p_hdr); - if (le32_to_cpu(extent->ee_block) > 0) + if (le32_to_cpu(extent->ee_block) > start) *iterator = le32_to_cpu(extent->ee_block) - 1; - else - /* Beginning is reached, end of the loop */ + else if (le32_to_cpu(extent->ee_block) == start) iterator = NULL; - /* Update path extent in case we need to stop */ - while (le32_to_cpu(extent->ee_block) < start) + else { + extent = EXT_LAST_EXTENT(path[depth].p_hdr); + while (le32_to_cpu(extent->ee_block) >= start) + extent--; + + if (extent == EXT_LAST_EXTENT(path[depth].p_hdr)) + break; + extent++; + iterator = NULL; + } path[depth].p_ext = extent; } ret = ext4_ext_shift_path_extents(path, shift, inode,