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Message-ID: <CAJg=8jyuSxDL6XvqEXY_66M20psRK2J53oBTP+fjV5xpW2-R6w@mail.gmail.com> Date: Sat, 20 Apr 2024 13:08:18 -0700 From: Marius Fleischer <fleischermarius@...il.com> To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, maple-tree@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: syzkaller@...glegroups.com, harrisonmichaelgreen@...il.com Subject: general protection fault in mas_empty_area_rev Hi, We would like to report the following bug which has been found by our modified version of syzkaller. ====================================================== description: general protection fault in mas_empty_area_rev affected file: lib/maple_tree.c kernel version: 6.9-rc4 kernel commit: 0bbac3facb5d6cc0171c45c9873a2dc96bea9680 git tree: upstream kernel config: attached crash reproducer: attached ====================================================== Crash log: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 79545 Comm: syz-executor.0 Not tainted 6.9.0-rc4-dirty #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:ma_dead_node lib/maple_tree.c:560 [inline] RIP: 0010:mas_data_end lib/maple_tree.c:1450 [inline] RIP: 0010:mas_empty_area_rev+0x15ad/0x2320 lib/maple_tree.c:5114 Code: 83 fd 02 77 0f 45 85 ed 74 0a e8 ae b8 dc f6 49 8d 5c 24 08 e8 a4 b8 dc f6 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 fc 08 00 00 49 8b 04 24 30 c0 49 39 c4 0f 84 92 RSP: 0018:ffffc9000fdff9b8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffffffff8aaf8efc RDI: 0000000000000007 RBP: 0000000000010000 R08: 0000000000000007 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000fdffb24 R15: ffffc9000fdffae8 FS: 0000555581ad4480(0000) GS:ffff888063600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000118 CR3: 0000000040576000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> unmapped_area_topdown mm/mmap.c:1643 [inline] vm_unmapped_area+0x2db/0xb30 mm/mmap.c:1682 arch_get_unmapped_area_topdown+0x384/0x750 arch/x86/kernel/sys_x86_64.c:212 thp_get_unmapped_area mm/huge_memory.c:864 [inline] thp_get_unmapped_area+0x361/0x430 mm/huge_memory.c:854 get_unmapped_area+0x1db/0x3e0 mm/mmap.c:1845 do_mmap+0x282/0xef0 mm/mmap.c:1261 vm_mmap_pgoff+0x1a7/0x3b0 mm/util.c:573 ksys_mmap_pgoff+0x7d/0x5b0 mm/mmap.c:1431 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xce/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efd0e48ed67 Code: Unable to access opcode bytes at 0x7efd0e48ed3d. RSP: 002b:00007fff4c4a2598 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efd0e48ed67 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 00007efd0d600640 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4c4a2850 R14: 0000000000021000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ma_dead_node lib/maple_tree.c:560 [inline] RIP: 0010:mas_data_end lib/maple_tree.c:1450 [inline] RIP: 0010:mas_empty_area_rev+0x15ad/0x2320 lib/maple_tree.c:5114 Code: 83 fd 02 77 0f 45 85 ed 74 0a e8 ae b8 dc f6 49 8d 5c 24 08 e8 a4 b8 dc f6 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 fc 08 00 00 49 8b 04 24 30 c0 49 39 c4 0f 84 92 RSP: 0018:ffffc9000fdff9b8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffffffff8aaf8efc RDI: 0000000000000007 RBP: 0000000000010000 R08: 0000000000000007 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000fdffb24 R15: ffffc9000fdffae8 FS: 0000555581ad4480(0000) GS:ffff888063600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c01aa34000 CR3: 0000000040576000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: 83 fd 02 cmp $0x2,%ebp 3: 77 0f ja 0x14 5: 45 85 ed test %r13d,%r13d 8: 74 0a je 0x14 a: e8 ae b8 dc f6 call 0xf6dcb8bd f: 49 8d 5c 24 08 lea 0x8(%r12),%rbx 14: e8 a4 b8 dc f6 call 0xf6dcb8bd 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 4c 89 e2 mov %r12,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 fc 08 00 00 jne 0x930 34: 49 8b 04 24 mov (%r12),%rax 38: 30 c0 xor %al,%al 3a: 49 39 c4 cmp %rax,%r12 3d: 0f .byte 0xf 3e: 84 .byte 0x84 3f: 92 xchg %eax,%edx ====================================================== Wishing you a nice day! Best, Marius Content of type "text/html" skipped View attachment "repro.c" of type "text/x-csrc" (7519 bytes) Download attachment "repro.syz" of type "application/octet-stream" (80 bytes) Download attachment "config-6.9-rc4" of type "application/octet-stream" (258818 bytes)
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