[RFC PATCH v6 05/11] x86/cet/ibt: ELF header parsing for IBT
STALE2875d
From: Yu-cheng Yu <hidden>
Date: 2018-11-19 21:55:48
Also in:
linux-arch, linux-doc, linux-mm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Revision v6 of 3 in this series.
Revisions (3)
- v6 current
- v7 [diff vs current]
- v8 [diff vs current]
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 <redacted> Signed-off-by: Yu-cheng Yu <redacted> --- arch/x86/include/uapi/asm/elf_property.h | 1 + arch/x86/kernel/elf.c | 5 +++++ 2 files changed, 6 insertions(+)
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 60e396e2abe9..7727b9332097 100644
--- a/arch/x86/kernel/elf.c
+++ b/arch/x86/kernel/elf.c@@ -353,6 +353,11 @@ 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