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([2a0b:e7c0:0:107::70f]) by smtp.gmail.com with ESMTPSA id m17sm18035071wrz.22.2021.12.01.00.00.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Dec 2021 00:00:02 -0800 (PST) Message-ID: Date: Wed, 1 Dec 2021 09:00:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.2 Subject: Re: [PATCH 3/3] x86: mm: add x86_64 support for page table check Content-Language: en-US To: Pasha Tatashin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, akpm@linux-foundation.org, rientjes@google.com, pjt@google.com, weixugc@google.com, gthelen@google.com, mingo@redhat.com, corbet@lwn.net, will@kernel.org, rppt@kernel.org, keescook@chromium.org, tglx@linutronix.de, peterz@infradead.org, masahiroy@kernel.org, samitolvanen@google.com, dave.hansen@linux.intel.com, x86@kernel.org, frederic@kernel.org, hpa@zytor.com, aneesh.kumar@linux.ibm.com References: <20211123214814.3756047-1-pasha.tatashin@soleen.com> <20211123214814.3756047-4-pasha.tatashin@soleen.com> From: Jiri Slaby In-Reply-To: <20211123214814.3756047-4-pasha.tatashin@soleen.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D5489D0000A2 X-Stat-Signature: hbr6zzh9eosj9icq5s7iwefd6whqxr45 Authentication-Results: imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of jirislaby@gmail.com designates 209.85.128.51 as permitted sender) smtp.mailfrom=jirislaby@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=kernel.org (policy=none) X-HE-Tag: 1638345603-542910 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 23. 11. 21, 22:48, Pasha Tatashin wrote: > Add page table check hooks into routines that modify user page tables. Hi, I bisected to this as this causes crashes during modules load: #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD 6d615067 P4D 6d615067 PUD 6d616063 PMD 800000006d2001e1 Oops: 0003 [#1] PREEMPT SMP PTI CPU: 0 PID: 6189 Comm: modprobe Kdump: loaded Tainted: G I E 5.16.0-rc2-next-20211129-vanilla #3 83846a405f0e3937f5c8dfbc7d449622b8f46369 Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS SDBLI944.86P 05/08/2007 RIP: 0010:jump_label_module_notify (kernel/jump_label.c:370 kernel/jump_label.c:670 kernel/jump_label.c:748) Code: 00 48 8b 43 08 a8 02 0f 85 e9 00 00 00 48 83 e0 fc 48 c7 02 00 00 00 00 48 89 42 08 48 8b 43 08 83 e0 03 48 09 c2 48 83 ca 02 <48> 89 53 08 4d 89 66 10 49 89 6e 08 48 8b 43 08 a8 02 0f 84 98 00 All code ======== 0: 00 48 8b add %cl,-0x75(%rax) 3: 43 08 a8 02 0f 85 e9 rex.XB or %bpl,-0x167af0fe(%r8) a: 00 00 add %al,(%rax) c: 00 48 83 add %cl,-0x7d(%rax) f: e0 fc loopne 0xd 11: 48 c7 02 00 00 00 00 movq $0x0,(%rdx) 18: 48 89 42 08 mov %rax,0x8(%rdx) 1c: 48 8b 43 08 mov 0x8(%rbx),%rax 20: 83 e0 03 and $0x3,%eax 23: 48 09 c2 or %rax,%rdx 26: 48 83 ca 02 or $0x2,%rdx 2a:* 48 89 53 08 mov %rdx,0x8(%rbx) <-- trapping instruction 2e: 4d 89 66 10 mov %r12,0x10(%r14) 32: 49 89 6e 08 mov %rbp,0x8(%r14) 36: 48 8b 43 08 mov 0x8(%rbx),%rax 3a: a8 02 test $0x2,%al 3c: 0f .byte 0xf 3d: 84 .byte 0x84 3e: 98 cwtl ... Code starting with the faulting instruction =========================================== 0: 48 89 53 08 mov %rdx,0x8(%rbx) 4: 4d 89 66 10 mov %r12,0x10(%r14) 8: 49 89 6e 08 mov %rbp,0x8(%r14) c: 48 8b 43 08 mov 0x8(%rbx),%rax 10: a8 02 test $0x2,%al 12: 0f .byte 0xf 13: 84 .byte 0x84 14: 98 cwtl ... RSP: 0018:ffffaf4dc051fbe8 EFLAGS: 00010282 RAX: 0000000000000001 RBX: ffffffff931ee760 RCX: 0000000000000001 RDX: ffff9d1aa7d43883 RSI: ffffffff91c50aa0 RDI: ffffffff931ee760 RBP: ffffffffc0782000 R08: 0000000000000020 R09: 0000000000000000 R10: ffff9d1aa7d43880 R11: 0000000000000000 R12: ffffffffc079a980 R13: ffffffffc0784080 R14: ffff9d1aa7d43ca0 R15: ffffffffc0782008 FS: 00007f87104b8740(0000) GS:ffff9d1b45c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff931ee768 CR3: 000000010fdce000 CR4: 00000000000006f0 Call Trace: blocking_notifier_call_chain_robust (kernel/notifier.c:83 kernel/notifier.c:118 kernel/notifier.c:283 kernel/notifier.c:271) load_module (./include/linux/notifier.h:198 kernel/module.c:3923 kernel/module.c:4100) __do_sys_finit_module (kernel/module.c:4224) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:113) > Signed-off-by: Pasha Tatashin > --- > arch/x86/Kconfig | 1 + > arch/x86/include/asm/pgtable.h | 29 +++++++++++++++++++++++++++-- > 2 files changed, 28 insertions(+), 2 deletions(-) > regards, -- js suse labs