https://github.com/torvalds/linux
Revision dc24f8b4ecd3d6c4153a1ec1bc2006ab32a41b8d authored by Paolo Abeni on 26 February 2020, 11:19:03 UTC, committed by David S. Miller on 27 February 2020, 04:49:50 UTC
syzbot noted that the master MPTCP socket lacks the icsk_sync_mss callback, and was able to trigger a null pointer dereference: BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 8e171067 P4D 8e171067 PUD 93fa2067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8984 Comm: syz-executor066 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc900020b7b80 EFLAGS: 00010246 RAX: 1ffff110124ba600 RBX: 0000000000000000 RCX: ffff88809fefa600 RDX: ffff8880994cdb18 RSI: 0000000000000000 RDI: ffff8880925d3140 RBP: ffffc900020b7bd8 R08: ffffffff870225be R09: fffffbfff140652a R10: fffffbfff140652a R11: 0000000000000000 R12: ffff8880925d35d0 R13: ffff8880925d3140 R14: dffffc0000000000 R15: 1ffff110124ba6ba FS: 0000000001a0b880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000a6d6f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cipso_v4_sock_setattr+0x34b/0x470 net/ipv4/cipso_ipv4.c:1888 netlbl_sock_setattr+0x2a7/0x310 net/netlabel/netlabel_kapi.c:989 smack_netlabel security/smack/smack_lsm.c:2425 [inline] smack_inode_setsecurity+0x3da/0x4a0 security/smack/smack_lsm.c:2716 security_inode_setsecurity+0xb2/0x140 security/security.c:1364 __vfs_setxattr_noperm+0x16f/0x3e0 fs/xattr.c:197 vfs_setxattr fs/xattr.c:224 [inline] setxattr+0x335/0x430 fs/xattr.c:451 __do_sys_fsetxattr fs/xattr.c:506 [inline] __se_sys_fsetxattr+0x130/0x1b0 fs/xattr.c:495 __x64_sys_fsetxattr+0xbf/0xd0 fs/xattr.c:495 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440199 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcadc19e48 EFLAGS: 00000246 ORIG_RAX: 00000000000000be RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440199 RDX: 0000000020000200 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000003 R09: 00000000004002c8 R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000401a20 R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000000 Address the issue adding a dummy icsk_sync_mss callback. To properly sync the subflows mss and options list we need some additional infrastructure, which will land to net-next. Reported-by: syzbot+f4dfece964792d80b139@syzkaller.appspotmail.com Fixes: 2303f994b3e1 ("mptcp: Associate MPTCP context with TCP socket") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 4f31c53
Tip revision: dc24f8b4ecd3d6c4153a1ec1bc2006ab32a41b8d authored by Paolo Abeni on 26 February 2020, 11:19:03 UTC
mptcp: add dummy icsk_sync_mss()
mptcp: add dummy icsk_sync_mss()
Tip revision: dc24f8b
File | Mode | Size |
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kasan | ||
Kconfig | -rw-r--r-- | 24.1 KB |
Kconfig.debug | -rw-r--r-- | 5.3 KB |
Makefile | -rw-r--r-- | 3.9 KB |
backing-dev.c | -rw-r--r-- | 28.5 KB |
balloon_compaction.c | -rw-r--r-- | 8.2 KB |
cleancache.c | -rw-r--r-- | 9.8 KB |
cma.c | -rw-r--r-- | 14.3 KB |
cma.h | -rw-r--r-- | 573 bytes |
cma_debug.c | -rw-r--r-- | 4.5 KB |
compaction.c | -rw-r--r-- | 74.8 KB |
debug.c | -rw-r--r-- | 6.4 KB |
debug_page_ref.c | -rw-r--r-- | 1.4 KB |
dmapool.c | -rw-r--r-- | 13.8 KB |
early_ioremap.c | -rw-r--r-- | 6.8 KB |
fadvise.c | -rw-r--r-- | 5.4 KB |
failslab.c | -rw-r--r-- | 1.4 KB |
filemap.c | -rw-r--r-- | 96.1 KB |
frame_vector.c | -rw-r--r-- | 6.5 KB |
frontswap.c | -rw-r--r-- | 14.2 KB |
gup.c | -rw-r--r-- | 70.9 KB |
gup_benchmark.c | -rw-r--r-- | 2.9 KB |
highmem.c | -rw-r--r-- | 11.7 KB |
hmm.c | -rw-r--r-- | 19.2 KB |
huge_memory.c | -rw-r--r-- | 85.1 KB |
hugetlb.c | -rw-r--r-- | 136.5 KB |
hugetlb_cgroup.c | -rw-r--r-- | 15.6 KB |
hwpoison-inject.c | -rw-r--r-- | 2.8 KB |
init-mm.c | -rw-r--r-- | 1.2 KB |
internal.h | -rw-r--r-- | 17.7 KB |
interval_tree.c | -rw-r--r-- | 3.1 KB |
khugepaged.c | -rw-r--r-- | 55.0 KB |
kmemleak-test.c | -rw-r--r-- | 2.6 KB |
kmemleak.c | -rw-r--r-- | 56.2 KB |
ksm.c | -rw-r--r-- | 89.2 KB |
list_lru.c | -rw-r--r-- | 14.6 KB |
maccess.c | -rw-r--r-- | 7.9 KB |
madvise.c | -rw-r--r-- | 28.9 KB |
mapping_dirty_helpers.c | -rw-r--r-- | 9.6 KB |
memblock.c | -rw-r--r-- | 58.3 KB |
memcontrol.c | -rw-r--r-- | 184.4 KB |
memfd.c | -rw-r--r-- | 7.9 KB |
memory-failure.c | -rw-r--r-- | 51.5 KB |
memory.c | -rw-r--r-- | 130.6 KB |
memory_hotplug.c | -rw-r--r-- | 47.0 KB |
mempolicy.c | -rw-r--r-- | 74.8 KB |
mempool.c | -rw-r--r-- | 15.8 KB |
memremap.c | -rw-r--r-- | 12.1 KB |
memtest.c | -rw-r--r-- | 2.8 KB |
migrate.c | -rw-r--r-- | 77.2 KB |
mincore.c | -rw-r--r-- | 7.6 KB |
mlock.c | -rw-r--r-- | 22.7 KB |
mm_init.c | -rw-r--r-- | 4.8 KB |
mmap.c | -rw-r--r-- | 100.1 KB |
mmu_context.c | -rw-r--r-- | 1.3 KB |
mmu_gather.c | -rw-r--r-- | 8.4 KB |
mmu_notifier.c | -rw-r--r-- | 34.2 KB |
mmzone.c | -rw-r--r-- | 2.4 KB |
mprotect.c | -rw-r--r-- | 15.5 KB |
mremap.c | -rw-r--r-- | 19.4 KB |
msync.c | -rw-r--r-- | 2.7 KB |
nommu.c | -rw-r--r-- | 45.6 KB |
oom_kill.c | -rw-r--r-- | 30.2 KB |
page-writeback.c | -rw-r--r-- | 84.8 KB |
page_alloc.c | -rw-r--r-- | 241.3 KB |
page_counter.c | -rw-r--r-- | 6.6 KB |
page_ext.c | -rw-r--r-- | 10.9 KB |
page_idle.c | -rw-r--r-- | 5.5 KB |
page_io.c | -rw-r--r-- | 10.8 KB |
page_isolation.c | -rw-r--r-- | 8.5 KB |
page_owner.c | -rw-r--r-- | 16.0 KB |
page_poison.c | -rw-r--r-- | 3.0 KB |
page_vma_mapped.c | -rw-r--r-- | 7.7 KB |
pagewalk.c | -rw-r--r-- | 14.2 KB |
percpu-internal.h | -rw-r--r-- | 6.3 KB |
percpu-km.c | -rw-r--r-- | 3.0 KB |
percpu-stats.c | -rw-r--r-- | 5.7 KB |
percpu-vm.c | -rw-r--r-- | 10.3 KB |
percpu.c | -rw-r--r-- | 91.3 KB |
pgtable-generic.c | -rw-r--r-- | 5.6 KB |
process_vm_access.c | -rw-r--r-- | 9.9 KB |
ptdump.c | -rw-r--r-- | 3.4 KB |
readahead.c | -rw-r--r-- | 16.5 KB |
rmap.c | -rw-r--r-- | 55.0 KB |
rodata_test.c | -rw-r--r-- | 1.3 KB |
shmem.c | -rw-r--r-- | 107.6 KB |
shuffle.c | -rw-r--r-- | 5.7 KB |
shuffle.h | -rw-r--r-- | 1.5 KB |
slab.c | -rw-r--r-- | 105.5 KB |
slab.h | -rw-r--r-- | 19.3 KB |
slab_common.c | -rw-r--r-- | 44.0 KB |
slob.c | -rw-r--r-- | 18.0 KB |
slub.c | -rw-r--r-- | 143.3 KB |
sparse-vmemmap.c | -rw-r--r-- | 6.9 KB |
sparse.c | -rw-r--r-- | 25.5 KB |
swap.c | -rw-r--r-- | 31.0 KB |
swap_cgroup.c | -rw-r--r-- | 5.2 KB |
swap_slots.c | -rw-r--r-- | 9.4 KB |
swap_state.c | -rw-r--r-- | 22.4 KB |
swapfile.c | -rw-r--r-- | 95.0 KB |
truncate.c | -rw-r--r-- | 26.7 KB |
usercopy.c | -rw-r--r-- | 9.5 KB |
userfaultfd.c | -rw-r--r-- | 15.7 KB |
util.c | -rw-r--r-- | 22.2 KB |
vmacache.c | -rw-r--r-- | 2.7 KB |
vmalloc.c | -rw-r--r-- | 93.4 KB |
vmpressure.c | -rw-r--r-- | 13.9 KB |
vmscan.c | -rw-r--r-- | 124.6 KB |
vmstat.c | -rw-r--r-- | 51.9 KB |
workingset.c | -rw-r--r-- | 20.5 KB |
z3fold.c | -rw-r--r-- | 46.6 KB |
zbud.c | -rw-r--r-- | 18.2 KB |
zpool.c | -rw-r--r-- | 11.2 KB |
zsmalloc.c | -rw-r--r-- | 62.0 KB |
zswap.c | -rw-r--r-- | 35.1 KB |
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