[B][C][SRU][PATCH 0/1] selftests/seccomp: Enhance per-arch ptrace syscall skip tests

[Po-Hsu Lin]

BugLink: https://bugs.launchpad.net/bugs/1812796

== SRU Justification ==
The TRACE_syscall.ptrace_syscall_dropped test in seccomp from
ubuntu_kernel_selftests will fail on a Power8 node with B/C kernel.

[ RUN ] TRACE_syscall.ptrace_syscall_dropped
seccomp_bpf.c:1808:TRACE_syscall.ptrace_syscall_dropped:Expected 1 (1) == syscall(286) (18446744073709551615)
TRACE_syscall.ptrace_syscall_dropped: Test failed at step #13
[ FAIL ] TRACE_syscall.ptrace_syscall_dropped

== Fix ==
* ed5f1326 (selftests/seccomp: Enhance per-arch ptrace syscall skip tests)

This patch can be cherry-picked into B/C, and it's already in Disco.
The ptrace_syscall_dropped will be changed into ptrace_syscall_faked,
and a new ptrace_syscall_errno test will be added.

== Test ==
Patch tested with different arch (amd64 / power8 / arm64 / i386), the
new test will pass on them except for PowerPC.

Although the faked (bug 1829363) and errno (bug 1829359) test will fail
on PowerPC, it's actually helping us to nail down a real issue in our
kernel.

== Regression Potential ==
Low, changes limited to the testing tool in the kernel.

Kees Cook (1):
  selftests/seccomp: Enhance per-arch ptrace syscall skip tests

 tools/testing/selftests/seccomp/seccomp_bpf.c | 72 +++++++++++++++++++++------
 1 file changed, 57 insertions(+), 15 deletions(-)

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2.7.4