diff mbox series

[v5,seccomp,3/5] x86: Enable seccomp architecture tracking

Message ID da58c3733d95c4f2115dd94225dfbe2573ba4d87.1602431034.git.yifeifz2@illinois.edu (mailing list archive)
State Not Applicable
Headers show
Series seccomp: Add bitmap cache of constant allow filter results | expand

Commit Message

YiFei Zhu Oct. 11, 2020, 3:47 p.m. UTC 
From: Kees Cook <keescook@chromium.org>

Provide seccomp internals with the details to calculate which syscall
table the running kernel is expecting to deal with. This allows for
efficient architecture pinning and paves the way for constant-action
bitmaps.

Signed-off-by: Kees Cook <keescook@chromium.org>
Co-developed-by: YiFei Zhu <yifeifz2@illinois.edu>
Signed-off-by: YiFei Zhu <yifeifz2@illinois.edu>
---
 arch/x86/include/asm/seccomp.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/seccomp.h b/arch/x86/include/asm/seccomp.h
index 2bd1338de236..b17d037c72ce 100644
--- a/arch/x86/include/asm/seccomp.h
+++ b/arch/x86/include/asm/seccomp.h
@@ -16,6 +16,23 @@ 
 #define __NR_seccomp_sigreturn_32	__NR_ia32_sigreturn
 #endif
 
+#ifdef CONFIG_X86_64
+# define SECCOMP_ARCH_NATIVE		AUDIT_ARCH_X86_64
+# define SECCOMP_ARCH_NATIVE_NR		NR_syscalls
+# ifdef CONFIG_COMPAT
+#  define SECCOMP_ARCH_COMPAT		AUDIT_ARCH_I386
+#  define SECCOMP_ARCH_COMPAT_NR	IA32_NR_syscalls
+# endif
+/*
+ * x32 will have __X32_SYSCALL_BIT set in syscall number. We don't support
+ * caching them and they are treated as out of range syscalls, which will
+ * always pass through the BPF filter.
+ */
+#else /* !CONFIG_X86_64 */
+# define SECCOMP_ARCH_NATIVE		AUDIT_ARCH_I386
+# define SECCOMP_ARCH_NATIVE_NR	        NR_syscalls
+#endif
+
 #include <asm-generic/seccomp.h>
 
 #endif /* _ASM_X86_SECCOMP_H */