Messages in this thread Patch in this message | | | From | Rick Edgecombe <> | Subject | [PATCH v8 36/40] x86/shstk: Wire in shadow stack interface | Date | Sat, 18 Mar 2023 17:15:31 -0700 |
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The kernel now has the main shadow stack functionality to support applications. Wire in the WRSS and shadow stack enable/disable functions into the existing shadow stack API skeleton.
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Tested-by: Pengfei Xu <pengfei.xu@intel.com> Tested-by: John Allen <john.allen@amd.com> Tested-by: Kees Cook <keescook@chromium.org> --- v4: - Remove "CET" references
v2: - Split from other patches --- arch/x86/kernel/shstk.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c index 01b45666f1b6..ee89c4206ac9 100644 --- a/arch/x86/kernel/shstk.c +++ b/arch/x86/kernel/shstk.c @@ -472,9 +472,17 @@ long shstk_prctl(struct task_struct *task, int option, unsigned long features) return -EINVAL; if (option == ARCH_SHSTK_DISABLE) { + if (features & ARCH_SHSTK_WRSS) + return wrss_control(false); + if (features & ARCH_SHSTK_SHSTK) + return shstk_disable(); return -EINVAL; } /* Handle ARCH_SHSTK_ENABLE */ + if (features & ARCH_SHSTK_SHSTK) + return shstk_setup(); + if (features & ARCH_SHSTK_WRSS) + return wrss_control(true); return -EINVAL; } -- 2.17.1
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