x86_64 syscall audit fast-path

This adds a fast path for 64-bit syscall entry and exit when
TIF_SYSCALL_AUDIT is set, but no other kind of syscall tracing.
This path does not need to save and restore all registers as
the general case of tracing does.  Avoiding the iret return path
when syscall audit is enabled helps performance a lot.

Signed-off-by: Roland McGrath <roland@redhat.com>

2 files changed, 50 insertions, 1 deletions

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index a169225869cc..db7d34a89d2e 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -53,6 +53,12 @@
 #include <asm/paravirt.h>
 #include <asm/ftrace.h>
 
+/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
+#include <linux/elf-em.h>
+#define AUDIT_ARCH_X86_64       (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
+#define __AUDIT_ARCH_64BIT 0x80000000
+#define __AUDIT_ARCH_LE    0x40000000
+
         .code64
 
 #ifdef CONFIG_FTRACE
@@ -351,6 +357,7 @@ ENTRY(system_call_after_swapgs)
         GET_THREAD_INFO(%rcx)
         testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%rcx)
         jnz tracesys
+system_call_fastpath:
         cmpq $__NR_syscall_max,%rax
         ja badsys
         movq %r10,%rcx
@@ -402,6 +409,10 @@ sysret_careful:
 sysret_signal:
         TRACE_IRQS_ON
         ENABLE_INTERRUPTS(CLBR_NONE)
+#ifdef CONFIG_AUDITSYSCALL
+        bt $TIF_SYSCALL_AUDIT,%edx
+        jc sysret_audit
+#endif
         /* edx: work flags (arg3) */
         leaq do_notify_resume(%rip),%rax
         leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1
@@ -418,8 +429,45 @@ badsys:
         movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
         jmp ret_from_sys_call
 
+#ifdef CONFIG_AUDITSYSCALL
+        /*
+         * Fast path for syscall audit without full syscall trace.
+         * We just call audit_syscall_entry() directly, and then
+         * jump back to the normal fast path.
+         */
+auditsys:
+        movq %r10,%r9                   /* 6th arg: 4th syscall arg */
+        movq %rdx,%r8                   /* 5th arg: 3rd syscall arg */
+        movq %rsi,%rcx                  /* 4th arg: 2nd syscall arg */
+        movq %rdi,%rdx                  /* 3rd arg: 1st syscall arg */
+        movq %rax,%rsi                  /* 2nd arg: syscall number */
+        movl $AUDIT_ARCH_X86_64,%edi    /* 1st arg: audit arch */
+        call audit_syscall_entry
+        LOAD_ARGS 0             /* reload call-clobbered registers */
+        jmp system_call_fastpath
+
+        /*
+         * Return fast path for syscall audit.  Call audit_syscall_exit()
+         * directly and then jump back to the fast path with TIF_SYSCALL_AUDIT
+         * masked off.
+         */
+sysret_audit:
+        movq %rax,%rsi          /* second arg, syscall return value */
+        cmpq $0,%rax            /* is it < 0? */
+        setl %al                /* 1 if so, 0 if not */
+        movzbl %al,%edi         /* zero-extend that into %edi */
+        inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
+        call audit_syscall_exit
+        movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
+        jmp sysret_check
+#endif  /* CONFIG_AUDITSYSCALL */
+
         /* Do syscall tracing */
 tracesys:                        
+#ifdef CONFIG_AUDITSYSCALL
+        testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%rcx)
+        jz auditsys
+#endif
         SAVE_REST
         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
         FIXUP_TOP_OF_STACK %rdi
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c10e7aae04d7..4699950e65bd 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1476,7 +1476,8 @@ void audit_syscall_entry(int arch, int major,
         struct audit_context *context = tsk->audit_context;
         enum audit_state     state;
 
-        BUG_ON(!context);
+        if (unlikely(!context))
+                return;
 
         /*
          * This happens only on certain architectures that make system