1 files changed, 87 insertions, 4 deletions

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 23d146ce676b..021d71bc69b5 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -15,6 +15,16 @@
 #include <asm/irqflags.h>
 #include <linux/linkage.h>
 
+/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
+#include <linux/elf-em.h>
+#define AUDIT_ARCH_I386         (EM_386|__AUDIT_ARCH_LE)
+#define __AUDIT_ARCH_LE    0x40000000
+
+#ifndef CONFIG_AUDITSYSCALL
+#define sysexit_audit int_ret_from_sys_call
+#define sysretl_audit int_ret_from_sys_call
+#endif
+
 #define IA32_NR_syscalls ((ia32_syscall_end - ia32_sys_call_table)/8)
 
         .macro IA32_ARG_FIXUP noebp=0
@@ -148,13 +158,15 @@ ENTRY(ia32_sysenter_target)
         ja      ia32_badsys
 sysenter_do_call:
         IA32_ARG_FIXUP 1
+sysenter_dispatch:
         call    *ia32_sys_call_table(,%rax,8)
         movq    %rax,RAX-ARGOFFSET(%rsp)
         GET_THREAD_INFO(%r10)
         DISABLE_INTERRUPTS(CLBR_NONE)
         TRACE_IRQS_OFF
         testl   $_TIF_ALLWORK_MASK,TI_flags(%r10)
-        jnz     int_ret_from_sys_call
+        jnz     sysexit_audit
+sysexit_from_sys_call:
         andl    $~TS_COMPAT,TI_status(%r10)
         /* clear IF, that popfq doesn't enable interrupts early */
         andl  $~0x200,EFLAGS-R11(%rsp) 
@@ -170,9 +182,63 @@ sysenter_do_call:
         TRACE_IRQS_ON
         ENABLE_INTERRUPTS_SYSEXIT32
 
-sysenter_tracesys:
+#ifdef CONFIG_AUDITSYSCALL
+        .macro auditsys_entry_common
+        movl %esi,%r9d                  /* 6th arg: 4th syscall arg */
+        movl %edx,%r8d                  /* 5th arg: 3rd syscall arg */
+        /* (already in %ecx)               4th arg: 2nd syscall arg */
+        movl %ebx,%edx                  /* 3rd arg: 1st syscall arg */
+        movl %eax,%esi                  /* 2nd arg: syscall number */
+        movl $AUDIT_ARCH_I386,%edi      /* 1st arg: audit arch */
+        call audit_syscall_entry
+        movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall number */
+        cmpl $(IA32_NR_syscalls-1),%eax
+        ja ia32_badsys
+        movl %ebx,%edi                  /* reload 1st syscall arg */
+        movl RCX-ARGOFFSET(%rsp),%esi   /* reload 2nd syscall arg */
+        movl RDX-ARGOFFSET(%rsp),%edx   /* reload 3rd syscall arg */
+        movl RSI-ARGOFFSET(%rsp),%ecx   /* reload 4th syscall arg */
+        movl RDI-ARGOFFSET(%rsp),%r8d   /* reload 5th syscall arg */
+        .endm
+
+        .macro auditsys_exit exit
+        testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
+        jnz int_ret_from_sys_call
+        TRACE_IRQS_ON
+        sti
+        movl %eax,%esi          /* second arg, syscall return value */
+        cmpl $0,%eax            /* 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
+        GET_THREAD_INFO(%r10)
+        movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall return value */
+        movl RBP-ARGOFFSET(%rsp),%ebp   /* reload user register value */
+        movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
+        cli
+        TRACE_IRQS_OFF
+        testl %edi,TI_flags(%r10)
+        jnz int_with_check
+        jmp \exit
+        .endm
+
+sysenter_auditsys:
         CFI_RESTORE_STATE
+        auditsys_entry_common
+        movl %ebp,%r9d                  /* reload 6th syscall arg */
+        jmp sysenter_dispatch
+
+sysexit_audit:
+        auditsys_exit sysexit_from_sys_call
+#endif
+
+sysenter_tracesys:
         xchgl   %r9d,%ebp
+#ifdef CONFIG_AUDITSYSCALL
+        testl   $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
+        jz      sysenter_auditsys
+#endif
         SAVE_REST
         CLEAR_RREGS
         movq    %r9,R9(%rsp)
@@ -252,13 +318,15 @@ cstar_do_call:
         cmpl $IA32_NR_syscalls-1,%eax
         ja  ia32_badsys
         IA32_ARG_FIXUP 1
+cstar_dispatch:
         call *ia32_sys_call_table(,%rax,8)
         movq %rax,RAX-ARGOFFSET(%rsp)
         GET_THREAD_INFO(%r10)
         DISABLE_INTERRUPTS(CLBR_NONE)
         TRACE_IRQS_OFF
         testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
-        jnz  int_ret_from_sys_call
+        jnz sysretl_audit
+sysretl_from_sys_call:
         andl $~TS_COMPAT,TI_status(%r10)
         RESTORE_ARGS 1,-ARG_SKIP,1,1,1
         movl RIP-ARGOFFSET(%rsp),%ecx
@@ -270,8 +338,23 @@ cstar_do_call:
         CFI_RESTORE rsp
         USERGS_SYSRET32
         
-cstar_tracesys: 
+#ifdef CONFIG_AUDITSYSCALL
+cstar_auditsys:
         CFI_RESTORE_STATE
+        movl %r9d,R9-ARGOFFSET(%rsp)    /* register to be clobbered by call */
+        auditsys_entry_common
+        movl R9-ARGOFFSET(%rsp),%r9d    /* reload 6th syscall arg */
+        jmp cstar_dispatch
+
+sysretl_audit:
+        auditsys_exit sysretl_from_sys_call
+#endif
+
+cstar_tracesys:
+#ifdef CONFIG_AUDITSYSCALL
+        testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
+        jz cstar_auditsys
+#endif
         xchgl %r9d,%ebp
         SAVE_REST
         CLEAR_RREGS