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x86/shstk: Wire in shadow stack interface

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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>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
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>
Link: https://lore.kernel.org/all/20230613001108.3040476-38-rick.p.edgecombe%40intel.com
This commit is contained in:
Rick Edgecombe 2023-06-12 17:11:03 -07:00 • committed by Dave Hansen
parent 0ee44885fe
commit 488af8ea71
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/shstk.c
View file

@ -502,9 +502,17 @@ 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;
}