Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  apparmor: fix missing bounds check on DEFAULT table in verify_dfa()  The verify_dfa() function only checks DEFAULT_TABLE bounds when the state is not differentially encoded.  When the verification loop traverses the differential encoding chain, it reads k = DEFAULT_TABLE[j] and uses k as an array index without validation. A malformed DFA with DEFAULT_TABLE[j] >= state_count, therefore, causes both out-of-bounds reads and writes.  [   57.179855] ================================================================== [   57.180549] BUG: KASAN: slab-out-of-bounds in verify_dfa+0x59a/0x660 [   57.180904] Read of size 4 at addr ffff888100eadec4 by task su/993  [   57.181554] CPU: 1 UID: 0 PID: 993 Comm: su Not tainted 6.19.0-rc7-next-20260127 #1 PREEMPT(lazy) [   57.181558] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   57.181563] Call Trace: [   57.181572]  <TASK> [   57.181577]  dump_stack_lvl+0x5e/0x80 [   57.181596]  print_report+0xc8/0x270 [   57.181605]  ? verify_dfa+0x59a/0x660 [   57.181608]  kasan_report+0x118/0x150 [   57.181620]  ? verify_dfa+0x59a/0x660 [   57.181623]  verify_dfa+0x59a/0x660 [   57.181627]  aa_dfa_unpack+0x1610/0x1740 [   57.181629]  ? __kmalloc_cache_noprof+0x1d0/0x470 [   57.181640]  unpack_pdb+0x86d/0x46b0 [   57.181647]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181653]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181656]  ? aa_unpack_nameX+0x1a8/0x300 [   57.181659]  aa_unpack+0x20b0/0x4c30 [   57.181662]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181664]  ? stack_depot_save_flags+0x33/0x700 [   57.181681]  ? kasan_save_track+0x4f/0x80 [   57.181683]  ? kasan_save_track+0x3e/0x80 [   57.181686]  ? __kasan_kmalloc+0x93/0xb0 [   57.181688]  ? __kvmalloc_node_noprof+0x44a/0x780 [   57.181693]  ? aa_simple_write_to_buffer+0x54/0x130 [   57.181697]  ? policy_update+0x154/0x330 [   57.181704]  aa_replace_profiles+0x15a/0x1dd0 [   57.181707]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181710]  ? __kvmalloc_node_noprof+0x44a/0x780 [   57.181712]  ? aa_loaddata_alloc+0x77/0x140 [   57.181715]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181717]  ? _copy_from_user+0x2a/0x70 [   57.181730]  policy_update+0x17a/0x330 [   57.181733]  profile_replace+0x153/0x1a0 [   57.181735]  ? rw_verify_area+0x93/0x2d0 [   57.181740]  vfs_write+0x235/0xab0 [   57.181745]  ksys_write+0xb0/0x170 [   57.181748]  do_syscall_64+0x8e/0x660 [   57.181762]  entry_SYSCALL_64_after_hwframe+0x76/0x7e [   57.181765] RIP: 0033:0x7f6192792eb2  Remove the MATCH_FLAG_DIFF_ENCODE condition to validate all DEFAULT_TABLE entries unconditionally.