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authorMickaël Salaün <mic@digikod.net>2015-12-29 23:35:45 +0300
committerRichard Weinberger <richard@nod.at>2016-01-10 23:49:49 +0300
commit4a0b88070406323487bad730d8945f482151a145 (patch)
treed4d35cb43c578bab371a1b12e109373b972b348c /tools
parente04c989eb785af61d2895d76d38c09166296f9c5 (diff)
downloadlinux-4a0b88070406323487bad730d8945f482151a145.tar.xz
selftests/seccomp: Remove the need for HAVE_ARCH_TRACEHOOK
Some architectures do not implement PTRACE_GETREGSET nor PTRACE_SETREGSET (required by HAVE_ARCH_TRACEHOOK) but only implement PTRACE_GETREGS and PTRACE_SETREGS (e.g. User-mode Linux). This improve seccomp selftest portability for architectures without HAVE_ARCH_TRACEHOOK support by defining a new trigger HAVE_GETREGS. For now, this is only enabled for i386 and x86_64 architectures. This is required to be able to run this tests on User-mode Linux. Signed-off-by: Mickaël Salaün <mic@digikod.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Will Drewry <wad@chromium.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Meredydd Luff <meredydd@senatehouse.org> Cc: David Drysdale <drysdale@google.com> Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/seccomp/seccomp_bpf.c27
1 files changed, 24 insertions, 3 deletions
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 882fe83a3554..b9453b838162 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1246,11 +1246,24 @@ TEST_F(TRACE_poke, getpid_runs_normally)
# error "Do not know how to find your architecture's registers and syscalls"
#endif
+/* 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__)
+#define HAVE_GETREGS
+#endif
+
/* Architecture-specific syscall fetching routine. */
int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
{
- struct iovec iov;
ARCH_REGS regs;
+#ifdef HAVE_GETREGS
+ EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, &regs)) {
+ TH_LOG("PTRACE_GETREGS failed");
+ return -1;
+ }
+#else
+ struct iovec iov;
iov.iov_base = &regs;
iov.iov_len = sizeof(regs);
@@ -1258,6 +1271,7 @@ int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
TH_LOG("PTRACE_GETREGSET failed");
return -1;
}
+#endif
return regs.SYSCALL_NUM;
}
@@ -1266,13 +1280,16 @@ int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
void change_syscall(struct __test_metadata *_metadata,
pid_t tracee, int syscall)
{
- struct iovec iov;
int ret;
ARCH_REGS regs;
-
+#ifdef HAVE_GETREGS
+ ret = ptrace(PTRACE_GETREGS, tracee, 0, &regs);
+#else
+ struct iovec iov;
iov.iov_base = &regs;
iov.iov_len = sizeof(regs);
ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
+#endif
EXPECT_EQ(0, ret);
#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
@@ -1312,9 +1329,13 @@ void change_syscall(struct __test_metadata *_metadata,
if (syscall == -1)
regs.SYSCALL_RET = 1;
+#ifdef HAVE_GETREGS
+ ret = ptrace(PTRACE_SETREGS, tracee, 0, &regs);
+#else
iov.iov_base = &regs;
iov.iov_len = sizeof(regs);
ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
+#endif
EXPECT_EQ(0, ret);
}