From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
will@kernel.org, james.morse@arm.com
Cc: mark.rutland@arm.com, keescook@chromium.org, maz@kernel.org,
broonie@kernel.org, labbott@redhat.com, robin.murphy@arm.com,
julien.thierry.kdev@gmail.com, alex.popov@linux.com
Subject: [PATCH 11/17] stackleak: allow C to call stackleak_erase()
Date: Wed, 8 Jan 2020 18:56:28 +0000 [thread overview]
Message-ID: <20200108185634.1163-12-mark.rutland@arm.com> (raw)
In-Reply-To: <20200108185634.1163-1-mark.rutland@arm.com>
Currently, stackleak_erase() has no prototype in a header file, and has
to be called directly from low-level architecture entry assembly code.
This necessitates ifdeffery and complicates the entry assembly.
To ameliorate matters, let's provide a prototype so that architecture
can call stackleak_erase() from slightly higher level C code used as
part of the entry flow. This makes things easier to read and maintain.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Popov <alex.popov@linux.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Will Deacon <will@kernel.org>
---
include/linux/stackleak.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/linux/stackleak.h b/include/linux/stackleak.h
index 3d5c3271a9a8..2b09d3759c76 100644
--- a/include/linux/stackleak.h
+++ b/include/linux/stackleak.h
@@ -15,6 +15,8 @@
#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
#include <asm/stacktrace.h>
+asmlinkage void notrace stackleak_erase(void);
+
static inline void stackleak_task_init(struct task_struct *t)
{
t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long);
@@ -30,6 +32,7 @@ int stack_erasing_sysctl(struct ctl_table *table, int write,
#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
static inline void stackleak_task_init(struct task_struct *t) { }
+static inline void stackleak_erase(void) { }
#endif
#endif
--
2.11.0
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next prev parent reply other threads:[~2020-01-08 18:59 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 18:56 [PATCH 00/17] arm64: entry deasmification and cleanup Mark Rutland
2020-01-08 18:56 ` [PATCH 01/17] arm64: entry: mark all entry code as notrace Mark Rutland
2020-01-09 5:21 ` Anshuman Khandual
2020-01-13 15:44 ` Mark Rutland
2020-01-08 18:56 ` [PATCH 02/17] arm64: entry: cleanup el0 svc handler naming Mark Rutland
2020-01-09 5:33 ` Anshuman Khandual
2020-01-08 18:56 ` [PATCH 03/17] arm64: entry: move arm64_preempt_schedule_irq to entry-common.c Mark Rutland
2020-01-09 5:36 ` Anshuman Khandual
2020-01-08 18:56 ` [PATCH 04/17] arm64: entry: move preempt logic to C Mark Rutland
2020-01-09 6:43 ` Anshuman Khandual
2020-01-09 12:22 ` Mark Rutland
2020-01-08 18:56 ` [PATCH 05/17] arm64: entry: add a call_on_stack helper Mark Rutland
2020-01-09 8:00 ` Anshuman Khandual
2020-01-14 18:24 ` Mark Rutland
2020-01-09 14:30 ` Laura Abbott
2020-01-09 14:46 ` Mark Rutland
2020-01-08 18:56 ` [PATCH 06/17] arm64: entry: convert irq entry to C Mark Rutland
2020-01-08 18:56 ` [PATCH 07/17] arm64: entry: convert error " Mark Rutland
2020-01-09 9:12 ` Anshuman Khandual
2020-01-09 12:49 ` Mark Rutland
2020-01-08 18:56 ` [PATCH 08/17] arm64: entry: Split el0_sync_compat from el0_sync Mark Rutland
2020-01-09 9:50 ` Anshuman Khandual
2020-01-08 18:56 ` [PATCH 09/17] arm64: entry: organise handler stubs consistently Mark Rutland
2020-01-09 10:01 ` Anshuman Khandual
2020-01-08 18:56 ` [PATCH 10/17] arm64: entry: consolidate EL1 return paths Mark Rutland
2020-01-10 3:39 ` Anshuman Khandual
2020-01-10 16:02 ` Mark Rutland
2020-01-08 18:56 ` Mark Rutland [this message]
2020-01-10 3:45 ` [PATCH 11/17] stackleak: allow C to call stackleak_erase() Anshuman Khandual
2020-01-10 16:07 ` Mark Rutland
2020-01-27 23:00 ` Kees Cook
2020-01-08 18:56 ` [PATCH 12/17] arm64: debug-monitors: refactor MDSCR manipulation Mark Rutland
2020-01-10 4:35 ` Anshuman Khandual
2020-01-10 16:09 ` Mark Rutland
2020-01-08 18:56 ` [PATCH 13/17] arm64: entry: move common el0 entry/return work to C Mark Rutland
2020-01-09 15:19 ` Mark Rutland
2020-01-08 18:56 ` [PATCH 14/17] arm64: entry: move NO_SYSCALL setup " Mark Rutland
2020-01-10 5:37 ` Anshuman Khandual
2020-01-08 18:56 ` [PATCH 15/17] arm64: entry: move ARM64_ERRATUM_845719 workaround " Mark Rutland
2020-01-08 18:56 ` [PATCH 16/17] arm64: entry: move ARM64_ERRATUM_1418040 " Mark Rutland
2020-01-08 18:56 ` [PATCH 17/17] arm64: entry: cleanup sp_el0 manipulation Mark Rutland
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