[PATCH v17 4/7] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking
From: Yu-cheng Yu <hidden>
Date: 2020-12-29 21:35:39
Also in:
linux-api, linux-arch, linux-doc, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
An ELF file's .note.gnu.property indicates features the file supports. The property is parsed at loading time and passed to arch_setup_elf_ property(). Update it for Indirect Branch Tracking. Signed-off-by: Yu-cheng Yu <redacted> --- arch/x86/kernel/process_64.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 2e8decf79f8c..c646221fd55b 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c@@ -864,6 +864,14 @@ int arch_setup_elf_property(struct arch_elf_state *state) r = cet_setup_shstk(); } + if (r < 0) + return r; + + if (static_cpu_has(X86_FEATURE_IBT)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_IBT) + r = cet_setup_ibt(); + } + return r; } #endif
--
2.21.0