CVE-2023-52770

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> f2fs: split initial and dynamic conditions for extent_cache<br /> <br /> Let&amp;#39;s allocate the extent_cache tree without dynamic conditions to avoid a<br /> missing condition causing a panic as below.<br /> <br /> # create a file w/ a compressed flag<br /> # disable the compression<br /> # panic while updating extent_cache<br /> <br /> F2FS-fs (dm-64): Swapfile: last extent is not aligned to section<br /> F2FS-fs (dm-64): Swapfile (3) is not align to section: 1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate(2097152 * N)<br /> Adding 124996k swap on ./swap-file. Priority:0 extents:2 across:17179494468k<br /> ==================================================================<br /> BUG: KASAN: null-ptr-deref in instrument_atomic_read_write out/common/include/linux/instrumented.h:101 [inline]<br /> BUG: KASAN: null-ptr-deref in atomic_try_cmpxchg_acquire out/common/include/asm-generic/atomic-instrumented.h:705 [inline]<br /> BUG: KASAN: null-ptr-deref in queued_write_lock out/common/include/asm-generic/qrwlock.h:92 [inline]<br /> BUG: KASAN: null-ptr-deref in __raw_write_lock out/common/include/linux/rwlock_api_smp.h:211 [inline]<br /> BUG: KASAN: null-ptr-deref in _raw_write_lock+0x5a/0x110 out/common/kernel/locking/spinlock.c:295<br /> Write of size 4 at addr 0000000000000030 by task syz-executor154/3327<br /> <br /> CPU: 0 PID: 3327 Comm: syz-executor154 Tainted: G O 5.10.185 #1<br /> Hardware name: emulation qemu-x86/qemu-x86, BIOS 2023.01-21885-gb3cc1cd24d 01/01/2023<br /> Call Trace:<br /> __dump_stack out/common/lib/dump_stack.c:77 [inline]<br /> dump_stack_lvl+0x17e/0x1c4 out/common/lib/dump_stack.c:118<br /> __kasan_report+0x16c/0x260 out/common/mm/kasan/report.c:415<br /> kasan_report+0x51/0x70 out/common/mm/kasan/report.c:428<br /> kasan_check_range+0x2f3/0x340 out/common/mm/kasan/generic.c:186<br /> __kasan_check_write+0x14/0x20 out/common/mm/kasan/shadow.c:37<br /> instrument_atomic_read_write out/common/include/linux/instrumented.h:101 [inline]<br /> atomic_try_cmpxchg_acquire out/common/include/asm-generic/atomic-instrumented.h:705 [inline]<br /> queued_write_lock out/common/include/asm-generic/qrwlock.h:92 [inline]<br /> __raw_write_lock out/common/include/linux/rwlock_api_smp.h:211 [inline]<br /> _raw_write_lock+0x5a/0x110 out/common/kernel/locking/spinlock.c:295<br /> __drop_extent_tree+0xdf/0x2f0 out/common/fs/f2fs/extent_cache.c:1155<br /> f2fs_drop_extent_tree+0x17/0x30 out/common/fs/f2fs/extent_cache.c:1172<br /> f2fs_insert_range out/common/fs/f2fs/file.c:1600 [inline]<br /> f2fs_fallocate+0x19fd/0x1f40 out/common/fs/f2fs/file.c:1764<br /> vfs_fallocate+0x514/0x9b0 out/common/fs/open.c:310<br /> ksys_fallocate out/common/fs/open.c:333 [inline]<br /> __do_sys_fallocate out/common/fs/open.c:341 [inline]<br /> __se_sys_fallocate out/common/fs/open.c:339 [inline]<br /> __x64_sys_fallocate+0xb8/0x100 out/common/fs/open.c:339<br /> do_syscall_64+0x35/0x50 out/common/arch/x86/entry/common.c:46