Kernel: Audit Support For The ARM Platform

This patch provides functionality to audit system call events on the
ARM platform. The implementation was based off the structure of the
MIPS platform and information in this
(http://lists.fedoraproject.org/pipermail/arm/2009-October/000382.html)
mailing list thread. The required audit_syscall_exit and
audit_syscall_entry checks were added to ptrace using the standard
registers for system call values (r0 through r3). A thread information
flag was added for auditing (TIF_SYSCALL_AUDIT) and a meta-flag was
added (_TIF_SYSCALL_WORK) to simplify modifications to the syscall
entry/exit. Now, if either the TRACE flag is set or the AUDIT flag is
set, the syscall_trace function will be executed. The prober changes
were made to Kconfig to allow CONFIG_AUDITSYSCALL to be enabled.

Due to platform availability limitations, this patch was only tested
on the Android platform running the modified "android-goldfish-2.6.29"
kernel. A test compile was performed using Code Sourcery's
cross-compilation toolset and the current linux-3.0 stable kernel. The
changes compile without error. I'm hoping, due to the simple modifications,
the patch is "obviously correct".

Signed-off-by: Nathaniel Husted <nhusted@gmail.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/arch/arm/include/asm/kprobes.h b/arch/arm/include/asm/kprobes.h
index feec867..f82ec22 100644 (file)
--- a/arch/arm/include/asm/kprobes.h
+++ b/arch/arm/include/asm/kprobes.h
@@ -24,7 +24,6 @@
 #define MAX_INSN_SIZE                  2
 #define MAX_STACK_SIZE                 64      /* 32 would probably be OK */
 
-#define regs_return_value(regs)                ((regs)->ARM_r0)
 #define flush_insn_slot(p)             do { } while (0)
 #define kretprobe_blacklist_size       0
 

diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index 96187ff..451808b 100644 (file)
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -189,6 +189,11 @@ static inline int valid_user_regs(struct pt_regs *regs)
        return 0;
 }
 
+static inline long regs_return_value(struct pt_regs *regs)
+{
+       return regs->ARM_r0;
+}
+
 #define instruction_pointer(regs)      (regs)->ARM_pc
 
 #ifdef CONFIG_SMP

diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index 0f30c3a..d4c24d4 100644 (file)
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -129,6 +129,7 @@ extern void vfp_flush_hwstate(struct thread_info *);
 /*
  * thread information flags:
  *  TIF_SYSCALL_TRACE  - syscall trace active
+ *  TIF_SYSCAL_AUDIT   - syscall auditing active
  *  TIF_SIGPENDING     - signal pending
  *  TIF_NEED_RESCHED   - rescheduling necessary
  *  TIF_NOTIFY_RESUME  - callback before returning to user
@@ -139,6 +140,7 @@ extern void vfp_flush_hwstate(struct thread_info *);
 #define TIF_NEED_RESCHED       1
 #define TIF_NOTIFY_RESUME      2       /* callback before returning to user */
 #define TIF_SYSCALL_TRACE      8
+#define TIF_SYSCALL_AUDIT      9
 #define TIF_POLLING_NRFLAG     16
 #define TIF_USING_IWMMXT       17
 #define TIF_MEMDIE             18      /* is terminating due to OOM killer */
@@ -149,11 +151,15 @@ extern void vfp_flush_hwstate(struct thread_info *);
 #define _TIF_NEED_RESCHED      (1 << TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME     (1 << TIF_NOTIFY_RESUME)
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
+#define _TIF_SYSCALL_AUDIT     (1 << TIF_SYSCALL_AUDIT)
 #define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)
 #define _TIF_USING_IWMMXT      (1 << TIF_USING_IWMMXT)
 #define _TIF_RESTORE_SIGMASK   (1 << TIF_RESTORE_SIGMASK)
 #define _TIF_SECCOMP           (1 << TIF_SECCOMP)
 
+/* Checks for any syscall work in entry-common.S */
+#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
+
 /*
  * Change these and you break ASM code in entry-common.S
  */

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index b2a27b6..520889c 100644 (file)
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -87,7 +87,7 @@ ENTRY(ret_from_fork)
        get_thread_info tsk
        ldr     r1, [tsk, #TI_FLAGS]            @ check for syscall tracing
        mov     why, #1
-       tst     r1, #_TIF_SYSCALL_TRACE         @ are we tracing syscalls?
+       tst     r1, #_TIF_SYSCALL_WORK          @ are we tracing syscalls?
        beq     ret_slow_syscall
        mov     r1, sp
        mov     r0, #1                          @ trace exit [IP = 1]
@@ -443,7 +443,7 @@ ENTRY(vector_swi)
 1:
 #endif
 
-       tst     r10, #_TIF_SYSCALL_TRACE                @ are we tracing syscalls?
+       tst     r10, #_TIF_SYSCALL_WORK         @ are we tracing syscalls?
        bne     __sys_trace
 
        cmp     scno, #NR_syscalls              @ check upper syscall limit

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 483727a..e1d5e19 100644 (file)
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -906,11 +906,6 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 {
        unsigned long ip;
 
-       if (!test_thread_flag(TIF_SYSCALL_TRACE))
-               return scno;
-       if (!(current->ptrace & PT_PTRACED))
-               return scno;
-
        /*
         * Save IP.  IP is used to denote syscall entry/exit:
         *  IP = 0 -> entry, = 1 -> exit
@@ -918,6 +913,17 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
        ip = regs->ARM_ip;
        regs->ARM_ip = why;
 
+       if (!ip)
+               audit_syscall_exit(regs);
+       else
+               audit_syscall_entry(AUDIT_ARCH_ARMEB, scno, regs->ARM_r0,
+                                   regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
+
+       if (!test_thread_flag(TIF_SYSCALL_TRACE))
+               return scno;
+       if (!(current->ptrace & PT_PTRACED))
+               return scno;
+
        current_thread_info()->syscall = scno;
 
        /* the 0x80 provides a way for the tracing parent to distinguish

diff --git a/init/Kconfig b/init/Kconfig
index 5ad8b77..fe25ffb 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -355,7 +355,7 @@ config AUDIT
 
 config AUDITSYSCALL
        bool "Enable system-call auditing support"
-       depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH)
+       depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || ARM)
        default y if SECURITY_SELINUX
        help
          Enable low-overhead system-call auditing infrastructure that