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| author |  Rick Edgecombe <rick.p.edgecombe@intel.com>
| 2023-06-12 17:11:03 -0700 |
|---|---|---|
| committer |  Dave Hansen <dave.hansen@linux.intel.com>
| 2023-08-02 15:01:51 -0700 |
| commit | 488af8ea7131185c1adcbb0b52da2b6800429ecb (patch) | |
| tree | fb1af1ca7db65a6547e357fac3941668efb3132f | |
| parent | x86: Expose thread features in /proc/$PID/status (diff) | |
| download | linux-488af8ea7131185c1adcbb0b52da2b6800429ecb.tar.gz linux-488af8ea7131185c1adcbb0b52da2b6800429ecb.tar.bz2 linux-488af8ea7131185c1adcbb0b52da2b6800429ecb.zip | |
x86/shstk: Wire in shadow stack interface
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
| -rw-r--r-- | arch/x86/kernel/shstk.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c index ea0bf113f9cf..d723cdc93474 100644 --- a/arch/x86/kernel/shstk.c +++ b/arch/x86/kernel/shstk.c @@ -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; } |