From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1622B34CD5 for ; Wed, 31 Jan 2024 06:37:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706683057; cv=none; b=bhadN2ClHNjUHHMC8vIHDrcjIUJ50c8q96Ynw4P7YWcT3ILS0yyJMkl4WWnlPSwGiV9h0z//73XDzeewaaCbAxSdIy4FDvBGT1Egugxrkm5gKjJE8W5wZgA2L7+FkdB+tQ3YIl/tK/ZA0v9ZJsCnOD7pD+X1RTwwjLVVqEa6Oh4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706683057; c=relaxed/simple; bh=4F6loPYuz4N3RYJ9UDbbZKzNyNev+yIVtiRK4cZzxag=; h=Date:To:From:Subject:Message-Id; b=FQYY/9sn6Z+ar/pUy9aIMP6mEwxNK2MrT5e+YpRsHB1NE35n7uqCPO0l6Ud4vPsCQ+r4EwiCd1R+F3gv0zboQvF/cS3HL1SCgoykOpTCGFWgU8SsHZEXAfwuL+ORqr0XTtE+Mi2NYR0oYhKWQ3e2Xe+ItYPIYS0IBj79WSz4e/M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=WpUycozY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="WpUycozY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E411AC433C7; Wed, 31 Jan 2024 06:37:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1706683056; bh=4F6loPYuz4N3RYJ9UDbbZKzNyNev+yIVtiRK4cZzxag=; h=Date:To:From:Subject:From; b=WpUycozYaN4V5X/oF1dZ9IP5R/CuG+rZ/Pt+YI6wNPBOG1QkHcnOAvJhzjDmMxDNU x5ovsMT5MrOPFwVsjwZI6yU7Z8aYmgmZrEdGRtb231ZM6qUNkK0XytNjdh1GMeMBGS N5i5d5CbJ7UPHRkTY/Kz6Afa6MqjmSjhmddLuFc0= Date: Tue, 30 Jan 2024 22:37:22 -0800 To: mm-commits@vger.kernel.org,will@kernel.org,tranmanphong@gmail.com,tglx@linutronix.de,svens@linux.ibm.com,steven.price@arm.com,peterz@infradead.org,paul.walmsley@sifive.com,palmer@dabbelt.com,npiggin@gmail.com,naveen.n.rao@linux.ibm.com,mpe@ellerman.id.au,mingo@redhat.com,mark.rutland@arm.com,luto@kernel.org,linux@armlinux.org.uk,keescook@chromium.org,hpa@zytor.com,hca@linux.ibm.com,greg@kroah.com,gor@linux.ibm.com,gerald.schaefer@linux.ibm.com,dave.hansen@linux.intel.com,catalin.marinas@arm.com,bp@alien8.de,borntraeger@linux.ibm.com,aou@eecs.berkeley.edu,aneesh.kumar@kernel.org,alexghiti@rivosinc.com,agordeev@linux.ibm.com,christophe.leroy@csgroup.eu,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-ptdump-add-check_wx_pages-debugfs-attribute.patch added to mm-unstable branch Message-Id: <20240131063734.E411AC433C7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: ptdump: add check_wx_pages debugfs attribute has been added to the -mm mm-unstable branch. Its filename is mm-ptdump-add-check_wx_pages-debugfs-attribute.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-ptdump-add-check_wx_pages-debugfs-attribute.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Christophe Leroy Subject: mm: ptdump: add check_wx_pages debugfs attribute Date: Tue, 30 Jan 2024 11:34:36 +0100 Add a readable attribute in debugfs to trigger a W^X pages check at any time. To trigger the test, just read /sys/kernel/debug/check_wx_pages It will report FAILED if the test failed, SUCCESS otherwise. Detailed result is provided into dmesg. Link: https://lkml.kernel.org/r/e947fb1a9f3f5466344823e532d343ff194ae03d.1706610398.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andy Lutomirski Cc: "Aneesh Kumar K.V (IBM)" Cc: Borislav Petkov (AMD) Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Dave Hansen Cc: Gerald Schaefer Cc: Greg KH Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Kees Cook Cc: Mark Rutland Cc: Michael Ellerman Cc: "Naveen N. Rao" Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Phong Tran Cc: Russell King Cc: Steven Price Cc: Sven Schnelle Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Will Deacon Signed-off-by: Andrew Morton --- mm/ptdump.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) --- a/mm/ptdump.c~mm-ptdump-add-check_wx_pages-debugfs-attribute +++ a/mm/ptdump.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include @@ -163,3 +164,24 @@ void ptdump_walk_pgd(struct ptdump_state /* Flush out the last page */ st->note_page(st, 0, -1, 0); } + +static int check_wx_show(struct seq_file *m, void *v) +{ + if (ptdump_check_wx()) + seq_puts(m, "SUCCESS\n"); + else + seq_puts(m, "FAILED\n"); + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(check_wx); + +static int ptdump_debugfs_init(void) +{ + debugfs_create_file("check_wx_pages", 0400, NULL, NULL, &check_wx_fops); + + return 0; +} + +device_initcall(ptdump_debugfs_init); _ Patches currently in -mm which might be from christophe.leroy@csgroup.eu are arm-ptdump-rename-config_debug_wx-to-config_arm_debug_wx.patch arm64-powerpc-riscv-s390-x86-ptdump-refactor-config_debug_wx.patch powerpcs390-ptdump-define-ptdump_check_wx-regardless-of-config_debug_wx.patch mm-ptdump-have-ptdump_check_wx-return-bool.patch mm-ptdump-add-check_wx_pages-debugfs-attribute.patch