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Message-Id: <20200912110820.597135-2-keescook@chromium.org>
Date: Sat, 12 Sep 2020 04:08:06 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
Thadeu Lima de Souza Cascardo <cascardo@...onical.com>,
Max Filippov <jcmvbkbc@...il.com>,
Michael Ellerman <mpe@...erman.id.au>,
Christian Brauner <christian@...uner.io>,
Andy Lutomirski <luto@...capital.net>,
Will Drewry <wad@...omium.org>,
linux-kselftest@...r.kernel.org, linux-mips@...r.kernel.org,
linux-xtensa@...ux-xtensa.org,
linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 01/15] selftests/seccomp: Refactor arch register macros to avoid xtensa special case
To avoid an xtensa special-case, refactor all arch register macros to
take the register variable instead of depending on the macro expanding
as a struct member name.
Signed-off-by: Kees Cook <keescook@...omium.org>
---
tools/testing/selftests/seccomp/seccomp_bpf.c | 97 +++++++++----------
1 file changed, 47 insertions(+), 50 deletions(-)
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index c5002fc25b00..fef15080b575 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1698,64 +1698,64 @@ TEST_F(TRACE_poke, getpid_runs_normally)
}
#if defined(__x86_64__)
-# define ARCH_REGS struct user_regs_struct
-# define SYSCALL_NUM orig_rax
-# define SYSCALL_RET rax
+# define ARCH_REGS struct user_regs_struct
+# define SYSCALL_NUM(_regs) (_regs).orig_rax
+# define SYSCALL_RET(_regs) (_regs).rax
#elif defined(__i386__)
-# define ARCH_REGS struct user_regs_struct
-# define SYSCALL_NUM orig_eax
-# define SYSCALL_RET eax
+# define ARCH_REGS struct user_regs_struct
+# define SYSCALL_NUM(_regs) (_regs).orig_eax
+# define SYSCALL_RET(_regs) (_regs).eax
#elif defined(__arm__)
-# define ARCH_REGS struct pt_regs
-# define SYSCALL_NUM ARM_r7
-# define SYSCALL_RET ARM_r0
+# define ARCH_REGS struct pt_regs
+# define SYSCALL_NUM(_regs) (_regs).ARM_r7
+# define SYSCALL_RET(_regs) (_regs).ARM_r0
#elif defined(__aarch64__)
-# define ARCH_REGS struct user_pt_regs
-# define SYSCALL_NUM regs[8]
-# define SYSCALL_RET regs[0]
+# define ARCH_REGS struct user_pt_regs
+# define SYSCALL_NUM(_regs) (_regs).regs[8]
+# define SYSCALL_RET(_regs) (_regs).regs[0]
#elif defined(__riscv) && __riscv_xlen == 64
-# define ARCH_REGS struct user_regs_struct
-# define SYSCALL_NUM a7
-# define SYSCALL_RET a0
+# define ARCH_REGS struct user_regs_struct
+# define SYSCALL_NUM(_regs) (_regs).a7
+# define SYSCALL_RET(_regs) (_regs).a0
#elif defined(__csky__)
-# define ARCH_REGS struct pt_regs
-#if defined(__CSKYABIV2__)
-# define SYSCALL_NUM regs[3]
-#else
-# define SYSCALL_NUM regs[9]
-#endif
-# define SYSCALL_RET a0
+# define ARCH_REGS struct pt_regs
+# if defined(__CSKYABIV2__)
+# define SYSCALL_NUM(_regs) (_regs).regs[3]
+# else
+# define SYSCALL_NUM(_regs) (_regs).regs[9]
+# endif
+# define SYSCALL_RET(_regs) (_regs).a0
#elif defined(__hppa__)
-# define ARCH_REGS struct user_regs_struct
-# define SYSCALL_NUM gr[20]
-# define SYSCALL_RET gr[28]
+# define ARCH_REGS struct user_regs_struct
+# define SYSCALL_NUM(_regs) (_regs).gr[20]
+# define SYSCALL_RET(_regs) (_regs).gr[28]
#elif defined(__powerpc__)
-# define ARCH_REGS struct pt_regs
-# define SYSCALL_NUM gpr[0]
-# define SYSCALL_RET gpr[3]
+# define ARCH_REGS struct pt_regs
+# define SYSCALL_NUM(_regs) (_regs).gpr[0]
+# define SYSCALL_RET(_regs) (_regs).gpr[3]
#elif defined(__s390__)
-# define ARCH_REGS s390_regs
-# define SYSCALL_NUM gprs[2]
-# define SYSCALL_RET gprs[2]
+# define ARCH_REGS s390_regs
+# define SYSCALL_NUM(_regs) (_regs).gprs[2]
+# define SYSCALL_RET(_regs) (_regs).gprs[2]
# define SYSCALL_NUM_RET_SHARE_REG
#elif defined(__mips__)
-# define ARCH_REGS struct pt_regs
-# define SYSCALL_NUM regs[2]
-# define SYSCALL_SYSCALL_NUM regs[4]
-# define SYSCALL_RET regs[2]
+# define ARCH_REGS struct pt_regs
+# define SYSCALL_NUM(_regs) (_regs).regs[2]
+# define SYSCALL_SYSCALL_NUM regs[4]
+# define SYSCALL_RET(_regs) (_regs).regs[2]
# define SYSCALL_NUM_RET_SHARE_REG
#elif defined(__xtensa__)
-# define ARCH_REGS struct user_pt_regs
-# define SYSCALL_NUM syscall
+# define ARCH_REGS struct user_pt_regs
+# define SYSCALL_NUM(_regs) (_regs).syscall
/*
* On xtensa syscall return value is in the register
* a2 of the current window which is not fixed.
*/
-#define SYSCALL_RET(reg) a[(reg).windowbase * 4 + 2]
+#define SYSCALL_RET(_regs) (_regs).a[(_regs).windowbase * 4 + 2]
#elif defined(__sh__)
-# define ARCH_REGS struct pt_regs
-# define SYSCALL_NUM gpr[3]
-# define SYSCALL_RET gpr[0]
+# define ARCH_REGS struct pt_regs
+# define SYSCALL_NUM(_regs) (_regs).gpr[3]
+# define SYSCALL_RET(_regs) (_regs).gpr[0]
#else
# error "Do not know how to find your architecture's registers and syscalls"
#endif
@@ -1804,10 +1804,10 @@ int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
#endif
#if defined(__mips__)
- if (regs.SYSCALL_NUM == __NR_O32_Linux)
+ if (SYSCALL_NUM(regs) == __NR_O32_Linux)
return regs.SYSCALL_SYSCALL_NUM;
#endif
- return regs.SYSCALL_NUM;
+ return SYSCALL_NUM(regs);
}
/* Architecture-specific syscall changing routine. */
@@ -1830,14 +1830,14 @@ void change_syscall(struct __test_metadata *_metadata,
defined(__s390__) || defined(__hppa__) || defined(__riscv) || \
defined(__xtensa__) || defined(__csky__) || defined(__sh__)
{
- regs.SYSCALL_NUM = syscall;
+ SYSCALL_NUM(regs) = syscall;
}
#elif defined(__mips__)
{
- if (regs.SYSCALL_NUM == __NR_O32_Linux)
+ if (SYSCALL_NUM(regs) == __NR_O32_Linux)
regs.SYSCALL_SYSCALL_NUM = syscall;
else
- regs.SYSCALL_NUM = syscall;
+ SYSCALL_NUM(regs) = syscall;
}
#elif defined(__arm__)
@@ -1871,11 +1871,8 @@ void change_syscall(struct __test_metadata *_metadata,
if (syscall == -1)
#ifdef SYSCALL_NUM_RET_SHARE_REG
TH_LOG("Can't modify syscall return on this architecture");
-
-#elif defined(__xtensa__)
- regs.SYSCALL_RET(regs) = result;
#else
- regs.SYSCALL_RET = result;
+ SYSCALL_RET(regs) = result;
#endif
#ifdef HAVE_GETREGS
--
2.25.1
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