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In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to do sanity check on i_extra_isize in is_alive()
syzbot found a f2fs bug:
BUG: KASAN: slab-out-of-bounds in data_blkaddr fs/f2fs/f2fs.h:2891 [inline] BUG: KASAN: slab-out-of-bounds in is_alive fs/f2fs/gc.c:1117 [inline] BUG: KASAN: slab-out-of-bounds in gc_data_segment fs/f2fs/gc.c:1520 [inline] BUG: KASAN: slab-out-of-bounds in do_garbage_collect+0x386a/0x3df0 fs/f2fs/gc.c:1734 Read of size 4 at addr ffff888076557568 by task kworker/u4:3/52
CPU: 1 PID: 52 Comm: kworker/u4:3 Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 data_blkaddr fs/f2fs/f2fs.h:2891 [inline] is_alive fs/f2fs/gc.c:1117 [inline] gc_data_segment fs/f2fs/gc.c:1520 [inline] do_garbage_collect+0x386a/0x3df0 fs/f2fs/gc.c:1734 f2fs_gc+0x88c/0x20a0 fs/f2fs/gc.c:1831 f2fs_balance_fs+0x544/0x6b0 fs/f2fs/segment.c:410 f2fs_write_inode+0x57e/0xe20 fs/f2fs/inode.c:753 write_inode fs/fs-writeback.c:1440 [inline] __writeback_single_inode+0xcfc/0x1440 fs/fs-writeback.c:1652 writeback_sb_inodes+0x54d/0xf90 fs/fs-writeback.c:1870 wb_writeback+0x2c5/0xd70 fs/fs-writeback.c:2044 wb_do_writeback fs/fs-writeback.c:2187 [inline] wb_workfn+0x2dc/0x12f0 fs/fs-writeback.c:2227 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
The root cause is that we forgot to do sanity check on .i_extra_isize in below path, result in accessing invalid address later, fix it. - gc_data_segment - is_alive - data_blkaddr - offset_in_addr
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Mar 31, 2025 | Mar 27, 2025 |
| Ubuntu | — | Upgrade linux-aws-5.15Upgrade linuxUpgrade linux-oracle-5.4Upgrade linux-awsUpgrade linux-azure-fdeUpgrade linux-gkeUpgrade linux-raspiUpgrade linux-gcpUpgrade linux-nvidia-tegra-5.15Upgrade linux-raspi-5.4Upgrade linux-aws-5.4Upgrade linux-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-ibm-5.4Upgrade linux-hwe-5.15Upgrade linux-iotUpgrade linux-bluefieldUpgrade linux-aws-fipsUpgrade linux-oracleUpgrade linux-azure-fipsUpgrade linux-gkeopUpgrade linux-riscv-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-nvidiaUpgrade linux-oracle-5.15Upgrade linux-kvmUpgrade linux-gcp-5.15Upgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-ibmUpgrade linux-azure-5.4Upgrade linux-azureUpgrade linux-intel-iot-realtimeUpgrade linux-intel-iotg-5.15Upgrade linux-lowlatencyUpgrade linux-gcp-5.4Upgrade linux-gcp-fipsUpgrade linux-azure-5.15Upgrade linux-hwe-5.4 | Apr 1, 2025 | Mar 27, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Mar 27, 2025 |
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