Message ID | 20221104223604.29615-14-rick.p.edgecombe@intel.com |
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State | New |
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Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>, Balbir Singh <bsingharora@gmail.com>, Borislav Petkov <bp@alien8.de>, Cyrill Gorcunov <gorcunov@gmail.com>, Dave Hansen <dave.hansen@linux.intel.com>, Eugene Syromiatnikov <esyr@redhat.com>, Florian Weimer <fweimer@redhat.com>, "H . J . Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>, Jonathan Corbet <corbet@lwn.net>, Kees Cook <keescook@chromium.org>, Mike Kravetz <mike.kravetz@oracle.com>, Nadav Amit <nadav.amit@gmail.com>, Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>, Peter Zijlstra <peterz@infradead.org>, Randy Dunlap <rdunlap@infradead.org>, "Ravi V . Shankar" <ravi.v.shankar@intel.com>, Weijiang Yang <weijiang.yang@intel.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, John Allen <john.allen@amd.com>, kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, akpm@linux-foundation.org Cc: rick.p.edgecombe@intel.com, Yu-cheng Yu <yu-cheng.yu@intel.com>, Peter Xu <peterx@redhat.com> Subject: [PATCH v3 13/37] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Date: Fri, 4 Nov 2022 15:35:40 -0700 Message-Id: <20221104223604.29615-14-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221104223604.29615-1-rick.p.edgecombe@intel.com> References: <20221104223604.29615-1-rick.p.edgecombe@intel.com> X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-kernel.vger.kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748607156961588933?= X-GMAIL-MSGID: =?utf-8?q?1748607156961588933?= |
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Shadow stacks for userspace
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Commit Message
Edgecombe, Rick P
Nov. 4, 2022, 10:35 p.m. UTC
From: Yu-cheng Yu <yu-cheng.yu@intel.com> To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38. Tested-by: Pengfei Xu <pengfei.xu@intel.com> Tested-by: John Allen <john.allen@amd.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Peter Xu <peterx@redhat.com> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> Reviewed-by: Axel Rasmussen <axelrasmussen@google.com> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Peter Xu <peterx@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> --- include/linux/mm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Fri, Nov 04, 2022 at 03:35:40PM -0700, Rick Edgecombe wrote: > From: Yu-cheng Yu <yu-cheng.yu@intel.com> > > To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all > VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38. Why thought ?!? Changelog utterly fails to provide rationale.
On Tue, 2022-11-15 at 12:20 +0100, Peter Zijlstra wrote: > On Fri, Nov 04, 2022 at 03:35:40PM -0700, Rick Edgecombe wrote: > > From: Yu-cheng Yu <yu-cheng.yu@intel.com> > > > > To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all > > VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to > > 38. > > Why thought ?!? Changelog utterly fails to provide rationale. I can beef this up. It is just a cleanup type thing to make things less scattered around. Thanks.
diff --git a/include/linux/mm.h b/include/linux/mm.h index 8bbcccbc5565..5314ad0a342d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -365,7 +365,7 @@ extern unsigned int kobjsize(const void *objp); #endif #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR -# define VM_UFFD_MINOR_BIT 37 +# define VM_UFFD_MINOR_BIT 38 # define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */ #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ # define VM_UFFD_MINOR VM_NONE