[PATCH 1/3] sparc64: Add compile-time asserts for siginfo_t offsets

Marco Elver
2021-04-29T19:16:53Z

To help catch ABI breaks at compile-time, add compile-time assertions to
verify the siginfo_t layout. Unlike other architectures, sparc64 is
special, because it is one of few architectures requiring si_trapno.
ABI breaks around that field would only be caught here.

Link: https://lkml.kernel.org/r/m11rat9f85.fsf@fess.ebiederm.org
Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Marco Elver <elver@google.com>
---
arch/sparc/kernel/signal32.c | 34 ++++++++++++++++++++++++++++++++++
arch/sparc/kernel/signal_64.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)

diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c
index e9695a06492f..778ed5c26d4a 100644
--- a/arch/sparc/kernel/signal32.c
+++ b/arch/sparc/kernel/signal32.c
@@ -745,3 +745,37 @@ asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
out:
return ret;
}
+
+/*
+ * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
+ * changes likely come with new fields that should be added below.
+ */
+static_assert(NSIGILL == 11);
+static_assert(NSIGFPE == 15);
+static_assert(NSIGSEGV == 9);
+static_assert(NSIGBUS == 5);
+static_assert(NSIGTRAP == 6);
+static_assert(NSIGCHLD == 6);
+static_assert(NSIGSYS == 2);
+static_assert(offsetof(compat_siginfo_t, si_signo) == 0x00);
+static_assert(offsetof(compat_siginfo_t, si_errno) == 0x04);
+static_assert(offsetof(compat_siginfo_t, si_code) == 0x08);
+static_assert(offsetof(compat_siginfo_t, si_pid) == 0x0c);
+static_assert(offsetof(compat_siginfo_t, si_uid) == 0x10);
+static_assert(offsetof(compat_siginfo_t, si_tid) == 0x0c);
+static_assert(offsetof(compat_siginfo_t, si_overrun) == 0x10);
+static_assert(offsetof(compat_siginfo_t, si_status) == 0x14);
+static_assert(offsetof(compat_siginfo_t, si_utime) == 0x18);
+static_assert(offsetof(compat_siginfo_t, si_stime) == 0x1c);
+static_assert(offsetof(compat_siginfo_t, si_value) == 0x14);
+static_assert(offsetof(compat_siginfo_t, si_int) == 0x14);
+static_assert(offsetof(compat_siginfo_t, si_ptr) == 0x14);
+static_assert(offsetof(compat_siginfo_t, si_addr) == 0x0c);
+static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10);
+static_assert(offsetof(compat_siginfo_t, si_addr_lsb) == 0x14);
+static_assert(offsetof(compat_siginfo_t, si_lower) == 0x18);
+static_assert(offsetof(compat_siginfo_t, si_upper) == 0x1c);
+static_assert(offsetof(compat_siginfo_t, si_pkey) == 0x18);
+static_assert(offsetof(compat_siginfo_t, si_perf) == 0x14);
+static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c);
+static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10);
diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
index a0eec62c825d..c9bbf5f29078 100644
--- a/arch/sparc/kernel/signal_64.c
+++ b/arch/sparc/kernel/signal_64.c
@@ -556,3 +556,36 @@ void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long
user_enter();
}

+/*
+ * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
+ * changes likely come with new fields that should be added below.
+ */
+static_assert(NSIGILL == 11);
+static_assert(NSIGFPE == 15);
+static_assert(NSIGSEGV == 9);
+static_assert(NSIGBUS == 5);
+static_assert(NSIGTRAP == 6);
+static_assert(NSIGCHLD == 6);
+static_assert(NSIGSYS == 2);
+static_assert(offsetof(siginfo_t, si_signo) == 0x00);
+static_assert(offsetof(siginfo_t, si_errno) == 0x04);
+static_assert(offsetof(siginfo_t, si_code) == 0x08);
+static_assert(offsetof(siginfo_t, si_pid) == 0x10);
+static_assert(offsetof(siginfo_t, si_uid) == 0x14);
+static_assert(offsetof(siginfo_t, si_tid) == 0x10);
+static_assert(offsetof(siginfo_t, si_overrun) == 0x14);
+static_assert(offsetof(siginfo_t, si_status) == 0x18);
+static_assert(offsetof(siginfo_t, si_utime) == 0x20);
+static_assert(offsetof(siginfo_t, si_stime) == 0x28);
+static_assert(offsetof(siginfo_t, si_value) == 0x18);
+static_assert(offsetof(siginfo_t, si_int) == 0x18);
+static_assert(offsetof(siginfo_t, si_ptr) == 0x18);
+static_assert(offsetof(siginfo_t, si_addr) == 0x10);
+static_assert(offsetof(siginfo_t, si_trapno) == 0x18);
+static_assert(offsetof(siginfo_t, si_addr_lsb) == 0x20);
+static_assert(offsetof(siginfo_t, si_lower) == 0x28);
+static_assert(offsetof(siginfo_t, si_upper) == 0x30);
+static_assert(offsetof(siginfo_t, si_pkey) == 0x28);
+static_assert(offsetof(siginfo_t, si_perf) == 0x20);
+static_assert(offsetof(siginfo_t, si_band) == 0x10);
+static_assert(offsetof(siginfo_t, si_fd) == 0x14);
--
2.31.1.527.g47e6f16901-goog