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| author | Peter Zijlstra <peterz@infradead.org> | 2022-03-08 16:30:36 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-03-15 10:32:39 +0100 |
| commit | af22700390c2f1d92dadd3eedf2738525a3a2f3a (patch) | |
| tree | 6535421fd452e6eb54f4cb2aef55782d7ee34949 /arch/x86/kernel/relocate_kernel_64.S | |
| parent | 991625f3dd2cbc4b787deb0213e2bcf8fa264b21 (diff) | |
| download | linux-af22700390c2f1d92dadd3eedf2738525a3a2f3a.tar.bz2 | |
x86/ibt,kexec: Disable CET on kexec
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154318.641454603@infradead.org
Diffstat (limited to 'arch/x86/kernel/relocate_kernel_64.S')
| -rw-r--r-- | arch/x86/kernel/relocate_kernel_64.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index 399f075ccdc4..5b65f6ec5ee6 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -115,6 +115,14 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) pushq %rdx /* + * Clear X86_CR4_CET (if it was set) such that we can clear CR0_WP + * below. + */ + movq %cr4, %rax + andq $~(X86_CR4_CET), %rax + movq %rax, %cr4 + + /* * Set cr0 to a known state: * - Paging enabled * - Alignment check disabled |