From: Thomas Gleixner <tglx@linutronix.de>
To: Andy Lutomirski <luto@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Pekka Enberg <penberg@kernel.org>, Linux-MM <linux-mm@kvack.org>
Subject: [patch V4 01/32] mm/slab: Fix broken stack trace storage
Date: Mon, 15 Apr 2019 11:02:58 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1904151101100.1729@nanos.tec.linutronix.de> (raw)
In-Reply-To: <alpine.DEB.2.21.1904141832400.4917@nanos.tec.linutronix.de>
kstack_end() is broken on interrupt stacks as they are not guaranteed to be
sized THREAD_SIZE and THREAD_SIZE aligned.
Use the stack tracer instead. Remove the pointless pointer increment at the
end of the function while at it.
Fixes: 98eb235b7feb ("[PATCH] page unmapping debug") - History tree
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: linux-mm@kvack.org
---
V4: Made the code simpler to understand (Andy) and make it actually compile
---
mm/slab.c | 30 ++++++++++++++----------------
1 file changed, 14 insertions(+), 16 deletions(-)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1470,33 +1470,31 @@ static bool is_debug_pagealloc_cache(str
static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr,
unsigned long caller)
{
- int size = cachep->object_size;
+ int size = cachep->object_size / sizeof(unsigned long);
addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)];
- if (size < 5 * sizeof(unsigned long))
+ if (size < 5)
return;
*addr++ = 0x12345678;
*addr++ = caller;
*addr++ = smp_processor_id();
- size -= 3 * sizeof(unsigned long);
+ size -= 3;
+#ifdef CONFIG_STACKTRACE
{
- unsigned long *sptr = &caller;
- unsigned long svalue;
-
- while (!kstack_end(sptr)) {
- svalue = *sptr++;
- if (kernel_text_address(svalue)) {
- *addr++ = svalue;
- size -= sizeof(unsigned long);
- if (size <= sizeof(unsigned long))
- break;
- }
- }
+ struct stack_trace trace = {
+ /* Leave one for the end marker below */
+ .max_entries = size - 1,
+ .entries = addr,
+ .skip = 3,
+ };
+ save_stack_trace(&trace);
+ addr += trace.nr_entries;
}
- *addr++ = 0x87654321;
+#endif
+ *addr = 0x87654321;
}
static void slab_kernel_map(struct kmem_cache *cachep, void *objp,
next prev parent reply other threads:[~2019-04-15 9:03 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-14 15:59 [patch V3 00/32] x86: Add guard pages to exception and interrupt stacks Thomas Gleixner
2019-04-14 15:59 ` [patch V3 01/32] mm/slab: Fix broken stack trace storage Thomas Gleixner
2019-04-14 16:16 ` Andy Lutomirski
2019-04-14 16:34 ` Thomas Gleixner
2019-04-15 9:02 ` Thomas Gleixner [this message]
2019-04-15 13:23 ` [patch V4 " Josh Poimboeuf
2019-04-15 16:07 ` Thomas Gleixner
2019-04-15 16:16 ` Josh Poimboeuf
2019-04-15 17:05 ` Andy Lutomirski
2019-04-15 21:22 ` Thomas Gleixner
2019-04-16 11:37 ` Vlastimil Babka
2019-04-16 14:10 ` [patch V5 01/32] mm/slab: Remove " Thomas Gleixner
2019-04-16 15:16 ` Vlastimil Babka
2019-04-15 21:20 ` [patch V4 01/32] mm/slab: Fix " Thomas Gleixner
2019-04-15 16:21 ` Peter Zijlstra
2019-04-15 16:58 ` [patch V3 " Andy Lutomirski
2019-04-14 15:59 ` [patch V3 02/32] x86/irq/64: Limit IST stack overflow check to #DB stack Thomas Gleixner
2019-04-17 14:02 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 03/32] x86/dumpstack: Fix off-by-one errors in stack identification Thomas Gleixner
2019-04-17 14:03 ` [tip:x86/irq] " tip-bot for Andy Lutomirski
2019-04-14 15:59 ` [patch V3 04/32] x86/irq/64: Remove a hardcoded irq_stack_union access Thomas Gleixner
2019-04-17 14:03 ` [tip:x86/irq] " tip-bot for Andy Lutomirski
2019-04-14 15:59 ` [patch V3 05/32] x86/irq/64: Sanitize the top/bottom confusion Thomas Gleixner
2019-04-17 14:04 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 06/32] x86/idt: Remove unused macro SISTG Thomas Gleixner
2019-04-17 14:05 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 07/32] x86/64: Remove stale CURRENT_MASK Thomas Gleixner
2019-04-17 14:06 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 08/32] x86/exceptions: Remove unused stack defines on 32bit Thomas Gleixner
2019-04-17 14:06 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 09/32] x86/exceptions: Make IST index zero based Thomas Gleixner
2019-04-17 14:07 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 10/32] x86/cpu_entry_area: Cleanup setup functions Thomas Gleixner
2019-04-17 14:08 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 11/32] x86/exceptions: Add structs for exception stacks Thomas Gleixner
2019-04-16 18:20 ` Sean Christopherson
2019-04-17 14:08 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 12/32] x86/cpu_entry_area: Prepare for IST guard pages Thomas Gleixner
2019-04-17 14:09 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 13/32] x86/cpu_entry_area: Provide exception stack accessor Thomas Gleixner
2019-04-17 14:10 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 14/32] x86/traps: Use cpu_entry_area instead of orig_ist Thomas Gleixner
2019-04-17 14:10 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 15/32] x86/irq/64: Use cpu entry area " Thomas Gleixner
2019-04-17 14:11 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 16/32] x86/dumpstack/64: Use cpu_entry_area " Thomas Gleixner
2019-04-17 14:12 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 17/32] x86/cpu: Prepare TSS.IST setup for guard pages Thomas Gleixner
2019-04-17 14:13 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 18/32] x86/cpu: Remove orig_ist array Thomas Gleixner
2019-04-17 14:13 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 19/32] x86/exceptions: Disconnect IST index and stack order Thomas Gleixner
2019-04-17 14:14 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 20/32] x86/exceptions: Enable IST guard pages Thomas Gleixner
2019-04-17 14:15 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 21/32] x86/exceptions: Split debug IST stack Thomas Gleixner
2019-04-16 22:07 ` Sean Christopherson
2019-04-17 14:15 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 22/32] x86/dumpstack/64: Speedup in_exception_stack() Thomas Gleixner
2019-04-17 14:16 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 15:59 ` [patch V3 23/32] x86/irq/32: Define IRQ_STACK_SIZE Thomas Gleixner
2019-04-17 14:17 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 24/32] x86/irq/32: Make irq stack a character array Thomas Gleixner
2019-04-17 14:18 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 25/32] x86/irq/32: Rename hard/softirq_stack to hard/softirq_stack_ptr Thomas Gleixner
2019-04-17 14:18 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 26/32] x86/irq/64: Rename irq_stack_ptr to hardirq_stack_ptr Thomas Gleixner
2019-04-17 14:19 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 27/32] x86/irq/32: Invoke irq_ctx_init() from init_IRQ() Thomas Gleixner
2019-04-17 14:20 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 28/32] x86/irq/32: Handle irq stack allocation failure proper Thomas Gleixner
2019-04-17 14:20 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 29/32] x86/irq/64: Init hardirq_stack_ptr during CPU hotplug Thomas Gleixner
2019-04-17 14:21 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
2019-04-14 16:00 ` [patch V3 30/32] x86/irq/64: Split the IRQ stack into its own pages Thomas Gleixner
2019-04-17 14:22 ` [tip:x86/irq] " tip-bot for Andy Lutomirski
2019-04-14 16:00 ` [patch V3 31/32] x86/irq/64: Remap the IRQ stack with guard pages Thomas Gleixner
2019-04-17 14:22 ` [tip:x86/irq] " tip-bot for Andy Lutomirski
2019-04-14 16:00 ` [patch V3 32/32] x86/irq/64: Remove stack overflow debug code Thomas Gleixner
2019-04-17 14:23 ` [tip:x86/irq] " tip-bot for Thomas Gleixner
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