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Message-Id: <20210503203814.25487-1-ebiederm@xmission.com>
Date: Mon, 3 May 2021 15:38:03 -0500
From: "Eric W. Beiderman" <ebiederm@...ssion.com>
To: Marco Elver <elver@...gle.com>
Cc: Arnd Bergmann <arnd@...db.de>, Florian Weimer <fweimer@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Collingbourne <pcc@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
sparclinux <sparclinux@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux API <linux-api@...r.kernel.org>,
kasan-dev <kasan-dev@...glegroups.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 01/12] sparc64: Add compile-time asserts for siginfo_t offsets
From: Marco Elver <elver@...gle.com>
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@...ssion.com>
Acked-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.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);
--
2.30.1
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