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Eric Dumazet a82984b3c6 xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING 
[ Upstream commit 237f3cf13b ]

syzbot reported an illegal copy in xsk_setsockopt() [1]

Make sure to validate setsockopt() @optlen parameter.

[1]

 BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
 BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]
 BUG: KASAN: slab-out-of-bounds in xsk_setsockopt+0x909/0xa40 net/xdp/xsk.c:1420
Read of size 4 at addr ffff888028c6cde3 by task syz-executor.0/7549

CPU: 0 PID: 7549 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
  __dump_stack lib/dump_stack.c:88 [inline]
  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
  print_address_description mm/kasan/report.c:377 [inline]
  print_report+0x169/0x550 mm/kasan/report.c:488
  kasan_report+0x143/0x180 mm/kasan/report.c:601
  copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
  copy_from_sockptr include/linux/sockptr.h:55 [inline]
  xsk_setsockopt+0x909/0xa40 net/xdp/xsk.c:1420
  do_sock_setsockopt+0x3af/0x720 net/socket.c:2311
  __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
  __do_sys_setsockopt net/socket.c:2343 [inline]
  __se_sys_setsockopt net/socket.c:2340 [inline]
  __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fb40587de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb40665a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb4059abf80 RCX: 00007fb40587de69
RDX: 0000000000000005 RSI: 000000000000011b RDI: 0000000000000006
RBP: 00007fb4058ca47a R08: 0000000000000002 R09: 0000000000000000
R10: 0000000020001980 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb4059abf80 R15: 00007fff57ee4d08
 </TASK>

Allocated by task 7549:
  kasan_save_stack mm/kasan/common.c:47 [inline]
  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
  poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
  __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
  kasan_kmalloc include/linux/kasan.h:211 [inline]
  __do_kmalloc_node mm/slub.c:3966 [inline]
  __kmalloc+0x233/0x4a0 mm/slub.c:3979
  kmalloc include/linux/slab.h:632 [inline]
  __cgroup_bpf_run_filter_setsockopt+0xd2f/0x1040 kernel/bpf/cgroup.c:1869
  do_sock_setsockopt+0x6b4/0x720 net/socket.c:2293
  __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
  __do_sys_setsockopt net/socket.c:2343 [inline]
  __se_sys_setsockopt net/socket.c:2340 [inline]
  __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

The buggy address belongs to the object at ffff888028c6cde0
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 1 bytes to the right of
 allocated 2-byte region [ffff888028c6cde0, ffff888028c6cde2)

The buggy address belongs to the physical page:
page:ffffea0000a31b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888028c6c9c0 pfn:0x28c6c
anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888014c41280 0000000000000000 dead000000000001
raw: ffff888028c6c9c0 0000000080800057 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 6648, tgid 6644 (syz-executor.0), ts 133906047828, free_ts 133859922223
  set_page_owner include/linux/page_owner.h:31 [inline]
  post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
  prep_new_page mm/page_alloc.c:1540 [inline]
  get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
  __alloc_pages+0x256/0x680 mm/page_alloc.c:4569
  __alloc_pages_node include/linux/gfp.h:238 [inline]
  alloc_pages_node include/linux/gfp.h:261 [inline]
  alloc_slab_page+0x5f/0x160 mm/slub.c:2175
  allocate_slab mm/slub.c:2338 [inline]
  new_slab+0x84/0x2f0 mm/slub.c:2391
  ___slab_alloc+0xc73/0x1260 mm/slub.c:3525
  __slab_alloc mm/slub.c:3610 [inline]
  __slab_alloc_node mm/slub.c:3663 [inline]
  slab_alloc_node mm/slub.c:3835 [inline]
  __do_kmalloc_node mm/slub.c:3965 [inline]
  __kmalloc_node+0x2db/0x4e0 mm/slub.c:3973
  kmalloc_node include/linux/slab.h:648 [inline]
  __vmalloc_area_node mm/vmalloc.c:3197 [inline]
  __vmalloc_node_range+0x5f9/0x14a0 mm/vmalloc.c:3392
  __vmalloc_node mm/vmalloc.c:3457 [inline]
  vzalloc+0x79/0x90 mm/vmalloc.c:3530
  bpf_check+0x260/0x19010 kernel/bpf/verifier.c:21162
  bpf_prog_load+0x1667/0x20f0 kernel/bpf/syscall.c:2895
  __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5631
  __do_sys_bpf kernel/bpf/syscall.c:5738 [inline]
  __se_sys_bpf kernel/bpf/syscall.c:5736 [inline]
  __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
page last free pid 6650 tgid 6647 stack trace:
  reset_page_owner include/linux/page_owner.h:24 [inline]
  free_pages_prepare mm/page_alloc.c:1140 [inline]
  free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346
  free_unref_page_list+0x5a3/0x850 mm/page_alloc.c:2532
  release_pages+0x2117/0x2400 mm/swap.c:1042
  tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
  tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
  tlb_flush_mmu+0x34d/0x4e0 mm/mmu_gather.c:300
  tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:392
  exit_mmap+0x4b6/0xd40 mm/mmap.c:3300
  __mmput+0x115/0x3c0 kernel/fork.c:1345
  exit_mm+0x220/0x310 kernel/exit.c:569
  do_exit+0x99e/0x27e0 kernel/exit.c:865
  do_group_exit+0x207/0x2c0 kernel/exit.c:1027
  get_signal+0x176e/0x1850 kernel/signal.c:2907
  arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
  exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
  exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
  __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
  syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212
  do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Memory state around the buggy address:
 ffff888028c6cc80: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
 ffff888028c6cd00: fa fc fc fc fa fc fc fc 00 fc fc fc 06 fc fc fc
>ffff888028c6cd80: fa fc fc fc fa fc fc fc fa fc fc fc 02 fc fc fc
                                                       ^
 ffff888028c6ce00: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
 ffff888028c6ce80: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc

Fixes: 423f38329d ("xsk: add umem fill queue support and mmap")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: "Björn Töpel" <bjorn@kernel.org>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
Cc: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Cc: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20240404202738.3634547-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-05-02 16:23:33 +02:00
arch x86/head/64: Re-enable stack protection 2024-04-13 12:59:58 +02:00
block block: prevent division by zero in blk_rq_stat_sum() 2024-04-13 12:59:49 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:13:17 +02:00
crypto crypto: api - Disallow identical driver names 2024-02-23 08:41:52 +01:00
Documentation x86/cpu: Enable STIBP on AMD if Automatic IBRS is enabled 2024-04-13 12:59:13 +02:00
drivers nouveau: fix function cast warning 2024-05-02 16:23:33 +02:00
fs ext4: forbid commit inconsistent quota data when errors=remount-ro 2024-04-13 12:59:47 +02:00
include u64_stats: fix u64_stats_init() for lockdep when used repeatedly in one file 2024-05-02 16:23:33 +02:00
init init: open /initrd.image with O_LARGEFILE 2024-04-13 12:59:02 +02:00
io_uring io_uring: ensure '0' is returned on file registration success 2024-04-13 12:59:22 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:24:00 +01:00
kernel ring-buffer: use READ_ONCE() to read cpu_buffer->commit_page in concurrent environment 2024-04-13 12:59:51 +02:00
lib net: blackhole_dev: fix build warning for ethh set but not used 2024-03-26 18:21:50 -04:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm x86/mm/pat: fix VM_PAT handling in COW mappings 2024-04-13 12:59:56 +02:00
net xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING 2024-05-02 16:23:33 +02:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:01:09 +02:00
scripts kbuild: dummy-tools: adjust to stricter stackprotector check 2024-04-13 12:59:57 +02:00
security smack: Handle SMACK64TRANSMUTE in smack_inode_setsecurity() 2024-04-13 12:58:00 +02:00
sound ALSA: hda/realtek: Update Panasonic CF-SZ6 quirk to support headset with microphone 2024-04-13 12:59:34 +02:00
tools tools: iio: replace seekdir() in iio_generic_buffer 2024-04-13 12:59:51 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:25:48 +01:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-13 12:58:04 +02:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
Makefile Linux 5.10.215 2024-04-13 12:59:59 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.