linux-kernel - Re: [syzbot] [crypto?] [ntfs3?] KMSAN: uninit-value in sw842

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Message-ID: <CACb6ct3x-hicbOn5ntiSUJdd3iPSmmnYcof4qH2ibauO7SG1KQ@mail.gmail.com>
Date: Fri, 13 Sep 2024 13:55:47 +0530
From: Sathvik Joel <ksjoe30@...il.com>
To: syzbot <syzbot+17cae3c0a5b0acdc327d@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [crypto?] [ntfs3?] KMSAN: uninit-value in sw842_compress

#syz test

On Fri, 13 Sept 2024 at 12:21, syzbot <
syzbot+17cae3c0a5b0acdc327d@...kaller.appspotmail.com> wrote:

> Hello,
>
> syzbot has tested the proposed patch but the reproducer is still
> triggering an issue:
> KMSAN: uninit-value in sw842_compress
>
> =====================================================
> BUG: KMSAN: uninit-value in check_template lib/842/842_compress.c:393
> [inline]
> BUG: KMSAN: uninit-value in process_next lib/842/842_compress.c:458
> [inline]
> BUG: KMSAN: uninit-value in sw842_compress+0x1744/0x5a70
> lib/842/842_compress.c:545
>  check_template lib/842/842_compress.c:393 [inline]
>  process_next lib/842/842_compress.c:458 [inline]
>  sw842_compress+0x1744/0x5a70 lib/842/842_compress.c:545
>  crypto842_scompress+0x4f/0x70 crypto/842.c:78
>  scomp_acomp_comp_decomp+0x7c6/0xb90
>  scomp_acomp_compress+0x32/0x40 crypto/scompress.c:187
>  crypto_acomp_compress include/crypto/acompress.h:251 [inline]
>  zswap_compress+0x368/0xad0 mm/zswap.c:927
>  zswap_store+0x1af3/0x2dd0 mm/zswap.c:1459
>  swap_writepage+0x11f/0x470 mm/page_io.c:198
>  shmem_writepage+0x1a75/0x1f70 mm/shmem.c:1536
>  pageout mm/vmscan.c:680 [inline]
>  shrink_folio_list+0x577f/0x7cb0 mm/vmscan.c:1360
>  evict_folios+0x9a49/0xbb30 mm/vmscan.c:4560
>  try_to_shrink_lruvec+0x13a3/0x1750 mm/vmscan.c:4755
>  lru_gen_shrink_lruvec mm/vmscan.c:4897 [inline]
>  shrink_lruvec+0x4a3/0x46c0 mm/vmscan.c:5652
>  shrink_node_memcgs mm/vmscan.c:5888 [inline]
>  shrink_node+0x104e/0x50f0 mm/vmscan.c:5928
>  shrink_zones mm/vmscan.c:6172 [inline]
>  do_try_to_free_pages+0x820/0x2550 mm/vmscan.c:6234
>  try_to_free_mem_cgroup_pages+0x3f7/0xae0 mm/vmscan.c:6566
>  try_charge_memcg+0x72c/0x1830 mm/memcontrol.c:2210
>  try_charge mm/memcontrol-v1.h:20 [inline]
>  charge_memcg mm/memcontrol.c:4438 [inline]
>  __mem_cgroup_charge+0x11d/0x3f0 mm/memcontrol.c:4453
>  mem_cgroup_charge include/linux/memcontrol.h:672 [inline]
>  shmem_alloc_and_add_folio+0xe83/0x1ca0 mm/shmem.c:1792
>  shmem_get_folio_gfp+0x10bd/0x24c0 mm/shmem.c:2188
>  shmem_read_folio_gfp+0x80/0x140 mm/shmem.c:5201
>  drm_gem_get_pages+0x3cf/0x1440 drivers/gpu/drm/drm_gem.c:568
>  drm_gem_shmem_get_pages drivers/gpu/drm/drm_gem_shmem_helper.c:177
> [inline]
>  drm_gem_shmem_vmap+0x2dc/0xca0 drivers/gpu/drm/drm_gem_shmem_helper.c:337
>  drm_gem_shmem_object_vmap+0x35/0x40 include/drm/drm_gem_shmem_helper.h:229
>  drm_gem_vmap drivers/gpu/drm/drm_gem.c:1205 [inline]
>  drm_gem_vmap_unlocked+0xc6/0x200 drivers/gpu/drm/drm_gem.c:1247
>  drm_gem_fb_vmap+0x11b/0x590
> drivers/gpu/drm/drm_gem_framebuffer_helper.c:365
>  vkms_prepare_fb+0x12f/0x170 drivers/gpu/drm/vkms/vkms_plane.c:176
>  drm_atomic_helper_prepare_planes+0x436/0x10b0
> drivers/gpu/drm/drm_atomic_helper.c:2601
>  drm_atomic_helper_commit+0x1f3/0xe80
> drivers/gpu/drm/drm_atomic_helper.c:2029
>  drm_atomic_commit+0x30a/0x380 drivers/gpu/drm/drm_atomic.c:1522
>  drm_atomic_helper_update_plane+0x42b/0x600
> drivers/gpu/drm/drm_atomic_helper.c:3190
>  __setplane_atomic+0x33d/0x3f0 drivers/gpu/drm/drm_plane.c:1074
>  drm_mode_cursor_universal drivers/gpu/drm/drm_plane.c:1229 [inline]
>  drm_mode_cursor_common+0x171a/0x1e80 drivers/gpu/drm/drm_plane.c:1288
>  drm_mode_cursor_ioctl+0x97/0xd0 drivers/gpu/drm/drm_plane.c:1338
>  drm_ioctl_kernel+0x4ea/0x560 drivers/gpu/drm/drm_ioctl.c:745
>  drm_ioctl+0xd13/0x15a0 drivers/gpu/drm/drm_ioctl.c:842
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:907 [inline]
>  __se_sys_ioctl+0x261/0x450 fs/ioctl.c:893
>  __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:893
>  x64_sys_call+0x18bf/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:17
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> <Zero or more stacks not recorded to save memory>
>
> Uninit was stored to memory at:
>  memcpy_from_iter lib/iov_iter.c:73 [inline]
>  iterate_bvec include/linux/iov_iter.h:122 [inline]
>  iterate_and_advance2 include/linux/iov_iter.h:249 [inline]
>  iterate_and_advance include/linux/iov_iter.h:271 [inline]
>  __copy_from_iter lib/iov_iter.c:249 [inline]
>  copy_page_from_iter_atomic+0x12bb/0x2ae0 lib/iov_iter.c:481
>  copy_folio_from_iter_atomic include/linux/uio.h:186 [inline]
>  generic_perform_write+0x896/0x12e0 mm/filemap.c:4032
>  shmem_file_write_iter+0x2bd/0x2f0 mm/shmem.c:3074
>  do_iter_readv_writev+0x8a1/0xa40
>  vfs_iter_write+0x459/0xd50 fs/read_write.c:895
>  lo_write_bvec drivers/block/loop.c:243 [inline]
>  lo_write_simple drivers/block/loop.c:264 [inline]
>  do_req_filebacked drivers/block/loop.c:511 [inline]
>  loop_handle_cmd drivers/block/loop.c:1910 [inline]
>  loop_process_work+0x15ec/0x3750 drivers/block/loop.c:1945
>  loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1976
>  process_one_work kernel/workqueue.c:3231 [inline]
>  process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
>  worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
>  kthread+0x3e2/0x540 kernel/kthread.c:389
>  ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> Uninit was stored to memory at:
>  ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
>  indx_write fs/ntfs3/index.c:1027 [inline]
>  indx_update_dup+0xd81/0xf80 fs/ntfs3/index.c:2694
>  ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
>  ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
>  ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
>  write_inode fs/fs-writeback.c:1497 [inline]
>  __writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
>  writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
>  __writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
>  wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
>  wb_check_background_flush fs/fs-writeback.c:2199 [inline]
>  wb_do_writeback fs/fs-writeback.c:2287 [inline]
>  wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
>  process_one_work kernel/workqueue.c:3231 [inline]
>  process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
>  worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
>  kthread+0x3e2/0x540 kernel/kthread.c:389
>  ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> Uninit was stored to memory at:
>  ntfs_read_run_nb+0x786/0x1070 fs/ntfs3/fsntfs.c:1252
>  ntfs_read_bh+0x64/0xde0 fs/ntfs3/fsntfs.c:1313
>  indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
>  indx_find+0xd12/0x1440 fs/ntfs3/index.c:1181
>  indx_update_dup+0x607/0xf80 fs/ntfs3/index.c:2666
>  ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
>  ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
>  ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
>  write_inode fs/fs-writeback.c:1497 [inline]
>  __writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
>  writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
>  __writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
>  wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
>  wb_check_background_flush fs/fs-writeback.c:2199 [inline]
>  wb_do_writeback fs/fs-writeback.c:2287 [inline]
>  wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
>  process_one_work kernel/workqueue.c:3231 [inline]
>  process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
>  worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
>  kthread+0x3e2/0x540 kernel/kthread.c:389
>  ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> Uninit was stored to memory at:
>  ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
>  indx_write fs/ntfs3/index.c:1027 [inline]
>  indx_update_dup+0xd81/0xf80 fs/ntfs3/index.c:2694
>  ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
>  ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
>  ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
>  write_inode fs/fs-writeback.c:1497 [inline]
>  __writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
>  writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
>  __writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
>  wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
>  wb_check_background_flush fs/fs-writeback.c:2199 [inline]
>  wb_do_writeback fs/fs-writeback.c:2287 [inline]
>  wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
>  process_one_work kernel/workqueue.c:3231 [inline]
>  process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
>  worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
>  kthread+0x3e2/0x540 kernel/kthread.c:389
>  ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> Uninit was stored to memory at:
>  ntfs_read_run_nb+0x786/0x1070 fs/ntfs3/fsntfs.c:1252
>  ntfs_read_bh+0x64/0xde0 fs/ntfs3/fsntfs.c:1313
>  indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
>  indx_find+0xd12/0x1440 fs/ntfs3/index.c:1181
>  indx_update_dup+0x607/0xf80 fs/ntfs3/index.c:2666
>  ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
>  ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
>  ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
>  write_inode fs/fs-writeback.c:1497 [inline]
>  __writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
>  writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
>  __writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
>  wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
>  wb_check_background_flush fs/fs-writeback.c:2199 [inline]
>  wb_do_writeback fs/fs-writeback.c:2287 [inline]
>  wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
>  process_one_work kernel/workqueue.c:3231 [inline]
>  process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
>  worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
>  kthread+0x3e2/0x540 kernel/kthread.c:389
>  ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> Uninit was stored to memory at:
>  ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
>  indx_write fs/ntfs3/index.c:1027 [inline]
>  indx_insert_into_buffer+0xd8f/0x2010 fs/ntfs3/index.c:1811
>  indx_insert_entry+0xa3c/0xee0 fs/ntfs3/index.c:1988
>  ni_add_name+0xe5d/0x10d0 fs/ntfs3/frecord.c:3123
>  ntfs_link_inode+0x265/0x310 fs/ntfs3/inode.c:1768
>  ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
>  vfs_link+0x93d/0xb70 fs/namei.c:4692
>  do_linkat+0x4f5/0xfd0 fs/namei.c:4762
>  __do_sys_link fs/namei.c:4796 [inline]
>  __se_sys_link fs/namei.c:4794 [inline]
>  __x64_sys_link+0xe8/0x140 fs/namei.c:4794
>  x64_sys_call+0x2853/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:87
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Uninit was stored to memory at:
>  hdr_insert_de fs/ntfs3/index.c:838 [inline]
>  indx_insert_into_buffer+0xcdf/0x2010 fs/ntfs3/index.c:1807
>  indx_insert_entry+0xa3c/0xee0 fs/ntfs3/index.c:1988
>  ni_add_name+0xe5d/0x10d0 fs/ntfs3/frecord.c:3123
>  ntfs_link_inode+0x265/0x310 fs/ntfs3/inode.c:1768
>  ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
>  vfs_link+0x93d/0xb70 fs/namei.c:4692
>  do_linkat+0x4f5/0xfd0 fs/namei.c:4762
>  __do_sys_link fs/namei.c:4796 [inline]
>  __se_sys_link fs/namei.c:4794 [inline]
>  __x64_sys_link+0xe8/0x140 fs/namei.c:4794
>  x64_sys_call+0x2853/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:87
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Uninit was created at:
>  slab_post_alloc_hook mm/slub.c:3998 [inline]
>  slab_alloc_node mm/slub.c:4041 [inline]
>  kmem_cache_alloc_noprof+0x637/0xb20 mm/slub.c:4048
>  ntfs_link_inode+0x8f/0x310 fs/ntfs3/inode.c:1756
>  ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
>  vfs_link+0x93d/0xb70 fs/namei.c:4692
>  do_linkat+0x4f5/0xfd0 fs/namei.c:4762
>  __do_sys_link fs/namei.c:4796 [inline]
>  __se_sys_link fs/namei.c:4794 [inline]
>  __x64_sys_link+0xe8/0x140 fs/namei.c:4794
>  x64_sys_call+0x2853/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:87
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> CPU: 1 UID: 0 PID: 5939 Comm: syz.0.15 Not tainted
> 6.11.0-rc7-syzkaller-g196145c606d0-dirty #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 08/06/2024
> =====================================================
>
>
> Tested on:
>
> commit:         196145c6 Merge tag 'clk-fixes-for-linus' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=159027c7980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ea008021530b2de3
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=17cae3c0a5b0acdc327d
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for
> Debian) 2.40
> patch:
> https://syzkaller.appspot.com/x/patch.diff?x=1453949f980000
>
>

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