From: Marco Elver <elver@google.com>
To: elver@google.com, ebiederm@xmission.com
Cc: linux@armlinux.org.uk, catalin.marinas@arm.com, will@kernel.org,
davem@davemloft.net, mark.rutland@arm.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org
Subject: [PATCH 1/3] sparc64: Add compile-time asserts for siginfo_t offsets
Date: Thu, 29 Apr 2021 21:07:32 +0200 [thread overview]
Message-ID: <20210429190734.624918-1-elver@google.com> (raw)
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
next reply other threads:[~2021-04-29 19:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-29 19:07 Marco Elver [this message]
2021-04-29 19:07 ` [PATCH 2/3] arm: Add compile-time asserts for siginfo_t offsets Marco Elver
2021-04-29 19:07 ` [PATCH 3/3] arm64: " Marco Elver
2021-05-26 17:42 ` Will Deacon
2021-05-26 17:50 ` Marco Elver
2021-05-26 18:29 ` Will Deacon
2021-07-02 8:51 ` Marco Elver
2021-07-12 10:38 ` Marco Elver
2021-04-30 17:42 ` [PATCH 1/3] sparc64: " Eric W. Biederman
2021-04-30 18:11 ` Marco Elver
2021-04-30 22:22 ` David Miller
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