From: Kees Cook keescook@chromium.org
[ 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@canonical.com Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@canonical.com Link: https://lore.kernel.org/linux-kselftest/20200911181012.171027-1-cascardo@can... Fixes: 5d83c2b37d43 ("selftests/seccomp: Add powerpc support") Signed-off-by: Kees Cook keescook@chromium.org Link: https://lore.kernel.org/lkml/20200912110820.597135-13-keescook@chromium.org Reviewed-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/seccomp/seccomp_bpf.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
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]