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selftests/seccomp: add MIPS self-test support 

This adds self-test support on MIPS, based on RFC patch from Kees Cook.
Modifications from the RFC:
- support the O32 syscall which passes the real syscall number in a0.
- Use PTRACE_{GET,SET}REGS
- Because SYSCALL_NUM and SYSCALL_RET are the same register, it is not
  possible to test modifying the syscall return value when skipping,
  since both would need to set the same register. Therefore modify that
  test case to just detect the skipped test.
Tested on MIPS32r2 / MIPS64r2 with O32, N32 and N64 userlands.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Will Drewry <wad@chromium.org>
Cc: IMG-MIPSLinuxKerneldevelopers@imgtec.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12977/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Matt Redfearn 2016-03-29 09:35:29 +01:00 committed by Ralf Baechle
parent 8571e645d1
commit 0ce105bf97
1 changed files with 28 additions and 2 deletions
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30
tools/testing/selftests/seccomp/seccomp_bpf.c
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@ -5,6 +5,7 @@
* Test code for seccomp bpf.
*/
#include <sys/types.h>
#include <asm/siginfo.h>
#define __have_siginfo_t 1
#define __have_sigval_t 1
@ -14,7 +15,6 @@
#include <linux/filter.h>
#include <sys/prctl.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/user.h>
#include <linux/prctl.h>
#include <linux/ptrace.h>
@ -1242,6 +1242,12 @@ TEST_F(TRACE_poke, getpid_runs_normally)
# define ARCH_REGS s390_regs
# define SYSCALL_NUM gprs[2]
# define SYSCALL_RET gprs[2]
#elif defined(__mips__)
# define ARCH_REGS struct pt_regs
# define SYSCALL_NUM regs[2]
# define SYSCALL_SYSCALL_NUM regs[4]
# define SYSCALL_RET regs[2]
# define SYSCALL_NUM_RET_SHARE_REG
#else
# error "Do not know how to find your architecture's registers and syscalls"
#endif
@ -1249,7 +1255,7 @@ TEST_F(TRACE_poke, getpid_runs_normally)
/* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
* architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
*/
#if defined(__x86_64__) || defined(__i386__)
#if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
#define HAVE_GETREGS
#endif
@ -1273,6 +1279,10 @@ int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
}
#endif
#if defined(__mips__)
if (regs.SYSCALL_NUM == __NR_O32_Linux)
return regs.SYSCALL_SYSCALL_NUM;
#endif
return regs.SYSCALL_NUM;
}
@ -1297,6 +1307,13 @@ void change_syscall(struct __test_metadata *_metadata,
{
regs.SYSCALL_NUM = syscall;
}
#elif defined(__mips__)
{
if (regs.SYSCALL_NUM == __NR_O32_Linux)
regs.SYSCALL_SYSCALL_NUM = syscall;
else
regs.SYSCALL_NUM = syscall;
}
#elif defined(__arm__)
# ifndef PTRACE_SET_SYSCALL
@ -1327,7 +1344,11 @@ void change_syscall(struct __test_metadata *_metadata,
/* If syscall is skipped, change return value. */
if (syscall == -1)
#ifdef SYSCALL_NUM_RET_SHARE_REG
TH_LOG("Can't modify syscall return on this architecture");
#else
regs.SYSCALL_RET = 1;
#endif
#ifdef HAVE_GETREGS
ret = ptrace(PTRACE_SETREGS, tracee, 0, &regs);
@ -1465,8 +1486,13 @@ TEST_F(TRACE_syscall, syscall_dropped)
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
#ifdef SYSCALL_NUM_RET_SHARE_REG
/* gettid has been skipped */
EXPECT_EQ(-1, syscall(__NR_gettid));
#else
/* gettid has been skipped and an altered return value stored. */
EXPECT_EQ(1, syscall(__NR_gettid));
#endif
EXPECT_NE(self->mytid, syscall(__NR_gettid));
}