9:37 a.m.
Paul Moore <paul(a)paul-moore.com> writes:
On Tue, Aug 24, 2021 at 1:11 PM Christophe Leroy
<christophe.leroy(a)csgroup.eu> wrote:
> Le 24/08/2021 à 16:47, Paul Moore a écrit :
> > On Tue, Aug 24, 2021 at 9:36 AM Christophe Leroy
> > <christophe.leroy(a)csgroup.eu> wrote:
> >>
> >> Commit e65e1fc2d24b ("[PATCH] syscall class hookup for all normal
> >> targets") added generic support for AUDIT but that didn't include
> >> support for bi-arch like powerpc.
> >>
> >> Commit 4b58841149dc ("audit: Add generic compat syscall support")
> >> added generic support for bi-arch.
> >>
> >> Convert powerpc to that bi-arch generic audit support.
> >>
> >> Cc: Paul Moore <paul(a)paul-moore.com>
> >> Cc: Eric Paris <eparis(a)redhat.com>
> >> Signed-off-by: Christophe Leroy <christophe.leroy(a)csgroup.eu>
> >> ---
> >> Resending v2 with Audit people in Cc
> >>
> >> v2:
> >> - Missing 'git add' for arch/powerpc/include/asm/unistd32.h
> >> - Finalised commit description
> >> ---
> >> arch/powerpc/Kconfig | 5 +-
> >> arch/powerpc/include/asm/unistd32.h | 7 +++
> >> arch/powerpc/kernel/Makefile | 3 --
> >> arch/powerpc/kernel/audit.c | 84 -----------------------------
> >> arch/powerpc/kernel/compat_audit.c | 44 ---------------
> >> 5 files changed, 8 insertions(+), 135 deletions(-)
> >> create mode 100644 arch/powerpc/include/asm/unistd32.h
> >> delete mode 100644 arch/powerpc/kernel/audit.c
> >> delete mode 100644 arch/powerpc/kernel/compat_audit.c
> >
> > Can you explain, in detail please, the testing you have done to verify
> > this patch?
> >
>
> I built ppc64_defconfig and checked that the generated code is functionnaly
equivalent.
>
> ppc32_classify_syscall() is exactly the same as audit_classify_compat_syscall()
except that the
> later takes the syscall as second argument (ie in r4) whereas the former takes it as
first argument
> (ie in r3).
>
> audit_classify_arch() and powerpc audit_classify_syscall() are slightly different
between the
> powerpc version and the generic version because the powerpc version checks whether it
is
> AUDIT_ARCH_PPC or not (ie value 20), while the generic one checks whether it has bit
> __AUDIT_ARCH_64BIT set or not (__AUDIT_ARCH_64BIT is the sign bit of a word), but
taking into
> account that the abi is either AUDIT_ARCH_PPC, AUDIT_ARCH_PPC64 or
AUDIT_ARCH_PPC64LE, the result is
> the same.
>
> If you are asking I guess you saw something wrong ?
I was asking because I didn't see any mention of testing, and when you
are enabling something significant like this it is nice to see that it
has been verified to work :)
While binary dumps and comparisons are nice, it is always good to see
verification from a test suite. I don't have access to the necessary
hardware to test this, but could you verify that the audit-testsuite
passes on your test system with your patches applied?
* https://github.com/linux-audit/audit-testsuite
I tested on ppc64le. Both before and after the patch I get the result
below.
So I guess the patch is OK, but maybe we have some existing issue.
I had a bit of a look at the test code, but my perl is limited. I think
it was running the command below, and it returned "<no matches>", but
not really sure what that means.
$ sudo ausearch -i -m SYSCALL -p 216440 -ui 0 -gi 0 -ul 0 -su unconfined
_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 -ts recent
<no matches>
cheers
Running as user root
with context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
on system Fedora
backlog_wait_time_actual_reset/test .. ok
exec_execve/test ..................... ok
exec_name/test ....................... ok
file_create/test ..................... ok
file_delete/test ..................... ok
file_rename/test ..................... ok
filter_exclude/test .................. 1/21
# Test 20 got: "256" (filter_exclude/test at line 167)
# Expected: "0"
# filter_exclude/test line 167 is: ok( $result, 0 );
# Test 21 got: "0" (filter_exclude/test at line 179)
# Expected: "1"
# filter_exclude/test line 179 is: ok( $found_msg, 1 );
filter_exclude/test .................. Failed 2/21 subtests
filter_saddr_fam/test ................ ok
filter_sessionid/test ................ ok
login_tty/test ....................... ok
lost_reset/test ...................... ok
netfilter_pkt/test ................... ok
syscalls_file/test ................... ok
syscall_module/test .................. ok
time_change/test ..................... ok
user_msg/test ........................ ok
fanotify/test ........................ ok
bpf/test ............................. ok
Test Summary Report
-------------------
filter_exclude/test (Wstat: 0 Tests: 21 Failed: 2)
Failed tests: 20-21
Files=18, Tests=202, 45 wallclock secs ( 0.18 usr 0.03 sys + 20.15 cusr 0.92 csys =
21.28 CPU)
Result: FAIL
Failed 1/18 test programs. 2/202 subtests failed.