This is a note to let you know that I've just added the patch titled
selftests/seccomp: powerpc: Fix seccomp return value testing
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-seccomp-powerpc-fix-seccomp-return-value-t.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 29df2a7df8ab633aa1d685728f5ed69f1251b195
Author: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Sat Sep 12 04:08:17 2020 -0700
selftests/seccomp: powerpc: Fix seccomp return value testing
[ Upstream commit 46138329faeac3598f5a4dc991a174386b6de833 ]
On powerpc, the errno is not inverted, and depends on ccr.so being
set. Add this to a powerpc definition of SYSCALL_RET_SET().
Co-developed-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/linux-kselftest/20200911181012.171027-1-cascardo@xxxxxxxxxxxxx/
Fixes: 5d83c2b37d43 ("selftests/seccomp: Add powerpc support")
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Link: https://lore.kernel.org/lkml/20200912110820.597135-13-keescook@xxxxxxxxxxxx
Reviewed-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index e2f38507a0621..9a9eb02539fb4 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1702,6 +1702,21 @@ TEST_F(TRACE_poke, getpid_runs_normally)
# define ARCH_REGS struct pt_regs
# define SYSCALL_NUM(_regs) (_regs).gpr[0]
# define SYSCALL_RET(_regs) (_regs).gpr[3]
+# define SYSCALL_RET_SET(_regs, _val) \
+ do { \
+ typeof(_val) _result = (_val); \
+ /* \
+ * A syscall error is signaled by CR0 SO bit \
+ * and the code is stored as a positive value. \
+ */ \
+ if (_result < 0) { \
+ SYSCALL_RET(_regs) = -result; \
+ (_regs).ccr |= 0x10000000; \
+ } else { \
+ SYSCALL_RET(_regs) = result; \
+ (_regs).ccr &= ~0x10000000; \
+ } \
+ } while (0)
#elif defined(__s390__)
# define ARCH_REGS s390_regs
# define SYSCALL_NUM(_regs) (_regs).gprs[2]
