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selftests/seccomp: powerpc: Fix seccomp return value testing

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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@canonical.com/
Fixes: 5d83c2b37d ("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>
This commit is contained in:
Kees Cook 2020-09-12 04:08:17 -07:00
parent f04cf78bbf
commit 46138329fa
1 changed files with 15 additions and 0 deletions
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15
tools/testing/selftests/seccomp/seccomp_bpf.c
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@ -1750,6 +1750,21 @@ 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]