From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: x86@kernel.org, "H. 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@amacapital.net>,
Balbir Singh <bsingharora@gmail.com>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.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>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: [RFC PATCH v4 5/9] x86/cet/ibt: ELF header parsing for IBT
Date: Fri, 21 Sep 2018 08:05:49 -0700 [thread overview]
Message-ID: <20180921150553.21016-6-yu-cheng.yu@intel.com> (raw)
Message-ID: <20180921150549.diKn99Tp8rfNhZHxHIrTjW7nC0kjVpCWCfBySluFMaw@z> (raw)
In-Reply-To: <20180921150553.21016-1-yu-cheng.yu@intel.com>
Look in .note.gnu.property of an ELF file and check if Indirect
Branch Tracking needs to be enabled for the task.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
arch/x86/include/uapi/asm/elf_property.h | 1 +
arch/x86/kernel/elf.c | 8 +++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/uapi/asm/elf_property.h b/arch/x86/include/uapi/asm/elf_property.h
index af361207718c..343a871b8fc1 100644
--- a/arch/x86/include/uapi/asm/elf_property.h
+++ b/arch/x86/include/uapi/asm/elf_property.h
@@ -11,5 +11,6 @@
* Bits for GNU_PROPERTY_X86_FEATURE_1_AND
*/
#define GNU_PROPERTY_X86_FEATURE_1_SHSTK (0x00000002)
+#define GNU_PROPERTY_X86_FEATURE_1_IBT (0x00000001)
#endif /* _UAPI_ASM_X86_ELF_PROPERTY_H */
diff --git a/arch/x86/kernel/elf.c b/arch/x86/kernel/elf.c
index 2fddd0bc545b..13358026cd64 100644
--- a/arch/x86/kernel/elf.c
+++ b/arch/x86/kernel/elf.c
@@ -300,7 +300,8 @@ int arch_setup_features(void *ehdr_p, void *phdr_p,
struct elf64_hdr *ehdr64 = ehdr_p;
- if (!cpu_feature_enabled(X86_FEATURE_SHSTK))
+ if (!cpu_feature_enabled(X86_FEATURE_SHSTK) &&
+ !cpu_feature_enabled(X86_FEATURE_IBT))
return 0;
if (ehdr64->e_ident[EI_CLASS] == ELFCLASS64) {
@@ -335,6 +336,11 @@ int arch_setup_features(void *ehdr_p, void *phdr_p,
}
}
+ if (cpu_feature_enabled(X86_FEATURE_IBT)) {
+ if (feature & GNU_PROPERTY_X86_FEATURE_1_IBT)
+ err = cet_setup_ibt();
+ }
+
out:
return err;
}
--
2.17.1
next prev parent reply other threads:[~2018-09-21 20:59 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 15:05 [RFC PATCH v4 0/9] Control Flow Enforcement: Branch Tracking, PTRACE Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-09-21 15:05 ` [RFC PATCH v4 1/9] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-09-21 15:05 ` [RFC PATCH v4 2/9] x86/cet/ibt: User-mode indirect branch tracking support Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-10-03 18:58 ` Eugene Syromiatnikov
2018-10-03 18:58 ` Eugene Syromiatnikov
2018-09-21 15:05 ` [RFC PATCH v4 3/9] x86/cet/ibt: Add IBT legacy code bitmap allocation function Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-10-03 19:57 ` Eugene Syromiatnikov
2018-10-03 19:57 ` Eugene Syromiatnikov
2018-10-05 16:13 ` Yu-cheng Yu
2018-10-05 16:13 ` Yu-cheng Yu
2018-10-05 16:28 ` Andy Lutomirski
2018-10-05 16:28 ` Andy Lutomirski
2018-10-05 16:58 ` Yu-cheng Yu
2018-10-05 16:58 ` Yu-cheng Yu
2018-10-05 17:07 ` Andy Lutomirski
2018-10-05 17:07 ` Andy Lutomirski
2018-10-05 17:26 ` Eugene Syromiatnikov
2018-10-05 17:26 ` Eugene Syromiatnikov
2018-10-10 15:56 ` Yu-cheng Yu
2018-10-10 15:56 ` Yu-cheng Yu
2018-10-04 16:11 ` Andy Lutomirski
2018-10-04 16:11 ` Andy Lutomirski
2018-09-21 15:05 ` [RFC PATCH v4 4/9] mm/mmap: Add IBT bitmap size to address space limit check Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-10-03 20:21 ` Eugene Syromiatnikov
2018-10-03 20:21 ` Eugene Syromiatnikov
2018-09-21 15:05 ` Yu-cheng Yu [this message]
2018-09-21 15:05 ` [RFC PATCH v4 5/9] x86/cet/ibt: ELF header parsing for IBT Yu-cheng Yu
2018-09-21 15:05 ` [RFC PATCH v4 6/9] x86/cet/ibt: Add arch_prctl functions " Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-10-04 13:28 ` Eugene Syromiatnikov
2018-10-04 13:28 ` Eugene Syromiatnikov
2018-10-04 15:37 ` Yu-cheng Yu
2018-10-04 15:37 ` Yu-cheng Yu
2018-10-04 16:07 ` Florian Weimer
2018-10-04 16:07 ` Florian Weimer
2018-10-04 16:12 ` Andy Lutomirski
2018-10-04 16:12 ` Andy Lutomirski
2018-10-04 16:25 ` Yu-cheng Yu
2018-10-04 16:25 ` Yu-cheng Yu
2018-10-04 16:08 ` Andy Lutomirski
2018-10-04 16:08 ` Andy Lutomirski
2018-09-21 15:05 ` [RFC PATCH v4 7/9] x86/cet/ibt: Add ENDBR to op-code-map Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-09-21 15:05 ` [RFC PATCH v4 8/9] x86: Insert endbr32/endbr64 to vDSO Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
2018-09-21 15:05 ` [RFC PATCH v4 9/9] x86/cet: Add PTRACE interface for CET Yu-cheng Yu
2018-09-21 15:05 ` Yu-cheng Yu
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