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authorRobert Sesek <rsesek@google.com>2015-11-02 20:28:49 (GMT)
committerShuah Khan <shuahkh@osg.samsung.com>2015-11-02 21:41:02 (GMT)
commitfd88d16c58c2ad689a68d6790c789e7d5be3fc5b (patch)
treec5428d64cb4c8942cac53694828bf261f9b76f08 /tools
parent256d0afb11d6e878e8c793e4a6e3bbfb81f9aae8 (diff)
downloadlinux-fd88d16c58c2ad689a68d6790c789e7d5be3fc5b.tar.xz
selftests/seccomp: Be more precise with syscall arguments.
Certain syscall emulation layers strictly check that the number of arguments match what the syscall handler expects. The KILL_one_arg_one and KILL_one_arg_six tests passed more parameters than expected to various syscalls, causing failures in this emulation mode. Instead, test using syscalls that take the appropriate number of arguments. Signed-off-by: Robert Sesek <rsesek@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/seccomp/seccomp_bpf.c46
1 files changed, 35 insertions, 11 deletions
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index e7bc5d3..e38cc54 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -29,6 +29,9 @@
#include <linux/elf.h>
#include <sys/uio.h>
#include <sys/utsname.h>
+#include <sys/fcntl.h>
+#include <sys/mman.h>
+#include <sys/times.h>
#define _GNU_SOURCE
#include <unistd.h>
@@ -429,14 +432,16 @@ TEST_SIGNAL(KILL_one, SIGSYS)
TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
{
+ void *fatal_address;
struct sock_filter filter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
offsetof(struct seccomp_data, nr)),
- BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
/* Only both with lower 32-bit for now. */
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
- BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
+ (unsigned long)&fatal_address, 0, 1),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
};
@@ -446,7 +451,8 @@ TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
};
long ret;
pid_t parent = getppid();
- pid_t pid = getpid();
+ struct tms timebuf;
+ clock_t clock = times(&timebuf);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
@@ -455,17 +461,22 @@ TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
ASSERT_EQ(0, ret);
EXPECT_EQ(parent, syscall(__NR_getppid));
- EXPECT_EQ(pid, syscall(__NR_getpid));
- /* getpid() should never return. */
- EXPECT_EQ(0, syscall(__NR_getpid, 0x0C0FFEE));
+ EXPECT_LE(clock, syscall(__NR_times, &timebuf));
+ /* times() should never return. */
+ EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
}
TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
{
+#ifndef __NR_mmap2
+ int sysno = __NR_mmap;
+#else
+ int sysno = __NR_mmap2;
+#endif
struct sock_filter filter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
offsetof(struct seccomp_data, nr)),
- BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
/* Only both with lower 32-bit for now. */
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
@@ -479,7 +490,8 @@ TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
};
long ret;
pid_t parent = getppid();
- pid_t pid = getpid();
+ int fd;
+ void *map1, *map2;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
@@ -487,10 +499,22 @@ TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
ASSERT_EQ(0, ret);
+ fd = open("/dev/zero", O_RDONLY);
+ ASSERT_NE(-1, fd);
+
EXPECT_EQ(parent, syscall(__NR_getppid));
- EXPECT_EQ(pid, syscall(__NR_getpid));
- /* getpid() should never return. */
- EXPECT_EQ(0, syscall(__NR_getpid, 1, 2, 3, 4, 5, 0x0C0FFEE));
+ map1 = (void *)syscall(sysno,
+ NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, PAGE_SIZE);
+ EXPECT_NE(MAP_FAILED, map1);
+ /* mmap2() should never return. */
+ map2 = (void *)syscall(sysno,
+ NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
+ EXPECT_EQ(MAP_FAILED, map2);
+
+ /* The test failed, so clean up the resources. */
+ munmap(map1, PAGE_SIZE);
+ munmap(map2, PAGE_SIZE);
+ close(fd);
}
/* TODO(wad) add 64-bit versus 32-bit arg tests. */