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Audit: push audit success and retcode into arch ptrace.h 

The audit system previously expected arches calling to audit_syscall_exit to
supply as arguments if the syscall was a success and what the return code was.
Audit also provides a helper AUDITSC_RESULT which was supposed to simplify things
by converting from negative retcodes to an audit internal magic value stating
success or failure.  This helper was wrong and could indicate that a valid
pointer returned to userspace was a failed syscall.  The fix is to fix the
layering foolishness.  We now pass audit_syscall_exit a struct pt_reg and it
in turns calls back into arch code to collect the return value and to
determine if the syscall was a success or failure.  We also define a generic
is_syscall_success() macro which determines success/failure based on if the
value is < -MAX_ERRNO.  This works for arches like x86 which do not use a
separate mechanism to indicate syscall failure.

We make both the is_syscall_success() and regs_return_value() static inlines
instead of macros.  The reason is because the audit function must take a void*
for the regs.  (uml calls theirs struct uml_pt_regs instead of just struct
pt_regs so audit_syscall_exit can't take a struct pt_regs).  Since the audit
function takes a void* we need to use static inlines to cast it back to the
arch correct structure to dereference it.

The other major change is that on some arches, like ia64, MIPS and ppc, we
change regs_return_value() to give us the negative value on syscall failure.
THE only other user of this macro, kretprobe_example.c, won't notice and it
makes the value signed consistently for the audit functions across all archs.

In arch/sh/kernel/ptrace_64.c I see that we were using regs[9] in the old
audit code as the return value.  But the ptrace_64.h code defined the macro
regs_return_value() as regs[3].  I have no idea which one is correct, but this
patch now uses the regs_return_value() function, so it now uses regs[3].

For powerpc we previously used regs->result but now use the
regs_return_value() function which uses regs->gprs[3].  regs->gprs[3] is
always positive so the regs_return_value(), much like ia64 makes it negative
before calling the audit code when appropriate.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: H. Peter Anvin <hpa@zytor.com> [for x86 portion]
Acked-by: Tony Luck <tony.luck@intel.com> [for ia64]
Acked-by: Richard Weinberger <richard@nod.at> [for uml]
Acked-by: David S. Miller <davem@davemloft.net> [for sparc]
Acked-by: Ralf Baechle <ralf@linux-mips.org> [for mips]
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [for ppc]
This commit is contained in:
Eric Paris 2012-01-03 14:23:06 -05:00 committed by Al Viro
parent 85e7bac33b
commit d7e7528bcd
26 changed files with 132 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/ia64/include/asm/ptrace.h
View File

@ -246,7 +246,18 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
return regs->ar_bspstore;
}
#define regs_return_value(regs) ((regs)->r8)
static inline int is_syscall_success(struct pt_regs *regs)
{
return regs->r10 != -1;
}
static inline long regs_return_value(struct pt_regs *regs)
{
if (is_syscall_success(regs))
return regs->r8;
else
return -regs->r8;
}
/* Conserve space in histogram by encoding slot bits in address
* bits 2 and 3 rather than bits 0 and 1.

9
arch/ia64/kernel/ptrace.c
View File

@ -1268,14 +1268,7 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
{
int step;
if (unlikely(current->audit_context)) {
int success = AUDITSC_RESULT(regs.r10);
long result = regs.r8;
if (success != AUDITSC_SUCCESS)
result = -result;
audit_syscall_exit(success, result);
}
audit_syscall_exit(&regs);
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))

5
arch/microblaze/include/asm/ptrace.h
View File

@ -61,6 +61,11 @@ struct pt_regs {
#define instruction_pointer(regs) ((regs)->pc)
#define profile_pc(regs) instruction_pointer(regs)
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->r3;
}
#else /* __KERNEL__ */
/* pt_regs offsets used by gdbserver etc in ptrace syscalls */

3
arch/microblaze/kernel/ptrace.c
View File

@ -159,8 +159,7 @@ asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->r3), regs->r3);
audit_syscall_exit(regs);
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))

14
arch/mips/include/asm/ptrace.h
View File

@ -137,7 +137,19 @@ extern int ptrace_set_watch_regs(struct task_struct *child,
*/
#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
#define regs_return_value(_regs) ((_regs)->regs[2])
static inline int is_syscall_success(struct pt_regs *regs)
{
return !regs->regs[7];
}
static inline long regs_return_value(struct pt_regs *regs)
{
if (is_syscall_success(regs))
return regs->regs[2];
else
return -regs->regs[2];
}
#define instruction_pointer(regs) ((regs)->cp0_epc)
#define profile_pc(regs) instruction_pointer(regs)

4
arch/mips/kernel/ptrace.c
View File

@ -572,9 +572,7 @@ asmlinkage void syscall_trace_enter(struct pt_regs *regs)
*/
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->regs[7]),
-regs->regs[2]);
audit_syscall_exit(regs);
if (!(current->ptrace & PT_PTRACED))
return;

13
arch/powerpc/include/asm/ptrace.h
View File

@ -86,7 +86,18 @@ struct pt_regs {
#define instruction_pointer(regs) ((regs)->nip)
#define user_stack_pointer(regs) ((regs)->gpr[1])
#define kernel_stack_pointer(regs) ((regs)->gpr[1])
#define regs_return_value(regs) ((regs)->gpr[3])
static inline int is_syscall_success(struct pt_regs *regs)
{
return !(regs->ccr & 0x10000000);
}
static inline long regs_return_value(struct pt_regs *regs)
{
if (is_syscall_success(regs))
return regs->gpr[3];
else
return -regs->gpr[3];
}
#ifdef CONFIG_SMP
extern unsigned long profile_pc(struct pt_regs *regs);

4
arch/powerpc/kernel/ptrace.c
View File

@ -1748,9 +1748,7 @@ void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
if (unlikely(current->audit_context))
audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
regs->result);
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->result);

6
arch/s390/include/asm/ptrace.h
View File

@ -541,9 +541,13 @@ struct user_regs_struct
#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
#define user_stack_pointer(regs)((regs)->gprs[15])
#define regs_return_value(regs)((regs)->gprs[2])
#define profile_pc(regs) instruction_pointer(regs)
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->gprs[2];
}
int regs_query_register_offset(const char *name);
const char *regs_query_register_name(unsigned int offset);
unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);

4
arch/s390/kernel/ptrace.c
View File

@ -751,9 +751,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
{
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]),
regs->gprs[2]);
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->gprs[2]);

5
arch/sh/include/asm/ptrace_32.h
View File

@ -76,7 +76,10 @@ struct pt_dspregs {
#ifdef __KERNEL__
#define MAX_REG_OFFSET offsetof(struct pt_regs, tra)
#define regs_return_value(_regs) ((_regs)->regs[0])
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->regs[0];
}
#endif /* __KERNEL__ */

5
arch/sh/include/asm/ptrace_64.h
View File

@ -13,7 +13,10 @@ struct pt_regs {
#ifdef __KERNEL__
#define MAX_REG_OFFSET offsetof(struct pt_regs, tregs[7])
#define regs_return_value(_regs) ((_regs)->regs[3])
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->regs[3];
}
#endif /* __KERNEL__ */

4
arch/sh/kernel/ptrace_32.c
View File

@ -530,9 +530,7 @@ asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
regs->regs[0]);
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->regs[0]);

4
arch/sh/kernel/ptrace_64.c
View File

@ -548,9 +548,7 @@ asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
regs->regs[9]);
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->regs[9]);

10
arch/sparc/include/asm/ptrace.h
View File

@ -207,7 +207,15 @@ do { current_thread_info()->syscall_noerror = 1; \
#define instruction_pointer(regs) ((regs)->tpc)
#define instruction_pointer_set(regs, val) ((regs)->tpc = (val))
#define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP])
#define regs_return_value(regs) ((regs)->u_regs[UREG_I0])
static inline int is_syscall_success(struct pt_regs *regs)
{
return !(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY));
}
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->u_regs[UREG_I0];
}
#ifdef CONFIG_SMP
extern unsigned long profile_pc(struct pt_regs *);
#else

11
arch/sparc/kernel/ptrace_64.c
View File

@ -1086,17 +1086,8 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs)
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
#ifdef CONFIG_AUDITSYSCALL
if (unlikely(current->audit_context)) {
unsigned long tstate = regs->tstate;
int result = AUDITSC_SUCCESS;
audit_syscall_exit(regs);
if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
result = AUDITSC_FAILURE;
audit_syscall_exit(result, regs->u_regs[UREG_I0]);
}
#endif
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->u_regs[UREG_G1]);

4
arch/um/kernel/ptrace.c
View File

@ -175,8 +175,8 @@ void syscall_trace(struct uml_pt_regs *regs, int entryexit)
UPT_SYSCALL_ARG2(regs),
UPT_SYSCALL_ARG3(regs),
UPT_SYSCALL_ARG4(regs));
else audit_syscall_exit(AUDITSC_RESULT(UPT_SYSCALL_RET(regs)),
UPT_SYSCALL_RET(regs));
else
audit_syscall_exit(regs);
}
/* Fake a debug trap */

10
arch/x86/ia32/ia32entry.S
View File

@ -14,6 +14,7 @@
#include <asm/segment.h>
#include <asm/irqflags.h>
#include <linux/linkage.h>
#include <linux/err.h>
/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
#include <linux/elf-em.h>
@ -208,12 +209,11 @@ sysexit_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 */
cmpl $-MAX_ERRNO,%eax /* is it an error ? */
setbe %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 RAX-ARGOFFSET(%rsp),%eax /* reload syscall return value */
call __audit_syscall_exit
movq RAX-ARGOFFSET(%rsp),%rax /* reload syscall return value */
movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
cli
TRACE_IRQS_OFF

8
arch/x86/kernel/entry_32.S
View File

@ -42,6 +42,7 @@
*/
#include <linux/linkage.h>
#include <linux/err.h>
#include <asm/thread_info.h>
#include <asm/irqflags.h>
#include <asm/errno.h>
@ -466,11 +467,10 @@ sysexit_audit:
TRACE_IRQS_ON
ENABLE_INTERRUPTS(CLBR_ANY)
movl %eax,%edx /* second arg, syscall return value */
cmpl $0,%eax /* is it < 0? */
setl %al /* 1 if so, 0 if not */
cmpl $-MAX_ERRNO,%eax /* is it an error ? */
setbe %al /* 1 if so, 0 if not */
movzbl %al,%eax /* zero-extend that */
inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
call audit_syscall_exit
call __audit_syscall_exit
DISABLE_INTERRUPTS(CLBR_ANY)
TRACE_IRQS_OFF
movl TI_flags(%ebp), %ecx

10
arch/x86/kernel/entry_64.S
View File

@ -55,6 +55,7 @@
#include <asm/paravirt.h>
#include <asm/ftrace.h>
#include <asm/percpu.h>
#include <linux/err.h>
/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
#include <linux/elf-em.h>
@ -563,17 +564,16 @@ auditsys:
jmp system_call_fastpath
/*
* Return fast path for syscall audit. Call audit_syscall_exit()
* 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-ARGOFFSET(%rsp),%rsi /* second arg, syscall return value */
cmpq $0,%rsi /* is it < 0? */
setl %al /* 1 if so, 0 if not */
cmpq $-MAX_ERRNO,%rsi /* is it < -MAX_ERRNO? */
setbe %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
call __audit_syscall_exit
movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
jmp sysret_check
#endif /* CONFIG_AUDITSYSCALL */

3
arch/x86/kernel/ptrace.c
View File

@ -1414,8 +1414,7 @@ void syscall_trace_leave(struct pt_regs *regs)
{
bool step;
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->ax);

4
arch/x86/kernel/vm86_32.c
View File

@ -335,9 +335,9 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk
if (info->flags & VM86_SCREEN_BITMAP)
mark_screen_rdonly(tsk->mm);
/*call audit_syscall_exit since we do not exit via the normal paths */
/*call __audit_syscall_exit since we do not exit via the normal paths */
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(0), 0);
__audit_syscall_exit(1, 0);
__asm__ __volatile__(
"movl %0,%%esp\n\t"

5
arch/x86/um/shared/sysdep/ptrace.h
View File

@ -3,3 +3,8 @@
#else
#include "ptrace_64.h"
#endif
static inline long regs_return_value(struct uml_pt_regs *regs)
{
return UPT_SYSCALL_RET(regs);
}

22
include/linux/audit.h
View File

@ -26,6 +26,7 @@
#include <linux/types.h>
#include <linux/elf-em.h>
#include <linux/ptrace.h>
/* The netlink messages for the audit system is divided into blocks:
* 1000 - 1099 are for commanding the audit system
@ -408,10 +409,6 @@ struct audit_field {
void *lsm_rule;
};
#define AUDITSC_INVALID 0
#define AUDITSC_SUCCESS 1
#define AUDITSC_FAILURE 2
#define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )
extern int __init audit_register_class(int class, unsigned *list);
extern int audit_classify_syscall(int abi, unsigned syscall);
extern int audit_classify_arch(int arch);
@ -424,7 +421,7 @@ extern void audit_free(struct task_struct *task);
extern void audit_syscall_entry(int arch,
int major, unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3);
extern void audit_syscall_exit(int failed, long return_code);
extern void __audit_syscall_exit(int ret_success, long ret_value);
extern void __audit_getname(const char *name);
extern void audit_putname(const char *name);
extern void __audit_inode(const char *name, const struct dentry *dentry);
@ -438,6 +435,15 @@ static inline int audit_dummy_context(void)
void *p = current->audit_context;
return !p || *(int *)p;
}
static inline void audit_syscall_exit(void *pt_regs)
{
if (unlikely(current->audit_context)) {
int success = is_syscall_success(pt_regs);
int return_code = regs_return_value(pt_regs);
__audit_syscall_exit(success, return_code);
}
}
static inline void audit_getname(const char *name)
{
if (unlikely(!audit_dummy_context()))
@ -551,12 +557,12 @@ static inline void audit_mmap_fd(int fd, int flags)
extern int audit_n_rules;
extern int audit_signals;
#else
#else /* CONFIG_AUDITSYSCALL */
#define audit_finish_fork(t)
#define audit_alloc(t) ({ 0; })
#define audit_free(t) do { ; } while (0)
#define audit_syscall_entry(ta,a,b,c,d,e) do { ; } while (0)
#define audit_syscall_exit(f,r) do { ; } while (0)
#define audit_syscall_exit(r) do { ; } while (0)
#define audit_dummy_context() 1
#define audit_getname(n) do { ; } while (0)
#define audit_putname(n) do { ; } while (0)
@ -587,7 +593,7 @@ extern int audit_signals;
#define audit_ptrace(t) ((void)0)
#define audit_n_rules 0
#define audit_signals 0
#endif
#endif /* CONFIG_AUDITSYSCALL */
#ifdef CONFIG_AUDIT
/* These are defined in audit.c */

10
include/linux/ptrace.h
View File

@ -112,6 +112,7 @@
#include <linux/compiler.h> /* For unlikely. */
#include <linux/sched.h> /* For struct task_struct. */
#include <linux/err.h> /* for IS_ERR_VALUE */
extern long arch_ptrace(struct task_struct *child, long request,
@ -265,6 +266,15 @@ static inline void ptrace_release_task(struct task_struct *task)
#define force_successful_syscall_return() do { } while (0)
#endif
#ifndef is_syscall_success
/*
* On most systems we can tell if a syscall is a success based on if the retval
* is an error value. On some systems like ia64 and powerpc they have different
* indicators of success/failure and must define their own.
*/
#define is_syscall_success(regs) (!IS_ERR_VALUE((unsigned long)(regs_return_value(regs))))
#endif
/*
* <asm/ptrace.h> should define the following things inside #ifdef __KERNEL__.
*

16
kernel/auditsc.c
View File

@ -70,6 +70,11 @@
#include "audit.h"
/* flags stating the success for a syscall */
#define AUDITSC_INVALID 0
#define AUDITSC_SUCCESS 1
#define AUDITSC_FAILURE 2
/* AUDIT_NAMES is the number of slots we reserve in the audit_context
* for saving names from getname(). If we get more names we will allocate
* a name dynamically and also add those to the list anchored by names_list. */
@ -1724,8 +1729,7 @@ void audit_finish_fork(struct task_struct *child)
/**
* audit_syscall_exit - deallocate audit context after a system call
* @valid: success/failure flag
* @return_code: syscall return value
* @pt_regs: syscall registers
*
* Tear down after system call. If the audit context has been marked as
* auditable (either because of the AUDIT_RECORD_CONTEXT state from
@ -1733,13 +1737,17 @@ void audit_finish_fork(struct task_struct *child)
* message), then write out the syscall information. In call cases,
* free the names stored from getname().
*/
void audit_syscall_exit(int valid, long return_code)
void __audit_syscall_exit(int success, long return_code)
{
struct task_struct *tsk = current;
struct audit_context *context;
context = audit_get_context(tsk, valid, return_code);
if (success)
success = AUDITSC_SUCCESS;
else
success = AUDITSC_FAILURE;
context = audit_get_context(tsk, success, return_code);
if (likely(!context))
return;