diff mbox series

[v30,05/10] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking

Message ID 20210830182221.3535-6-yu-cheng.yu@intel.com (mailing list archive)
State New
Headers show
Series Control-flow Enforcement: Indirect Branch Tracking | expand

Commit Message

Yu-cheng Yu Aug. 30, 2021, 6:22 p.m. UTC 
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 <yu-cheng.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
---
v27:
- Remove selecting of ARCH_USE_GNU_PROPERTY and ARCH_BINFMT_ELF_STATE,
  since they are already selected by X86_64.
---
 arch/x86/kernel/process_64.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 4271963fdd8c..4ab751a5146e 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -884,6 +884,12 @@  int arch_setup_elf_property(struct arch_elf_state *state)
 
 	if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
 		r = shstk_setup();
+
+	if (r < 0)
+		return r;
+
+	if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_IBT)
+		r = ibt_setup();
 #endif
 
 	return r;