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x86, kasan, ftrace: Put APIC interrupt handlers into .irqentry.text 

Dmitry Vyukov has reported unexpected KASAN stackdepot growth:

  https://github.com/google/kasan/issues/36

... which is caused by the APIC handlers not being present in .irqentry.text:

When building with CONFIG_FUNCTION_GRAPH_TRACER=y or CONFIG_KASAN=y, put the
APIC interrupt handlers into the .irqentry.text section. This is needed
because both KASAN and function graph tracer use __irqentry_text_start and
__irqentry_text_end to determine whether a function is an IRQ entry point.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: aryabinin@virtuozzo.com
Cc: kasan-dev@googlegroups.com
Cc: kcc@google.com
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/1468575763-144889-1-git-send-email-glider@google.com
[ Minor edits. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alexander Potapenko 2016-07-15 11:42:43 +02:00 committed by Ingo Molnar
parent a0cba2179e
commit 469f002312
1 changed files with 11 additions and 0 deletions
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11
arch/x86/entry/entry_64.S
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@ -601,9 +601,20 @@ apicinterrupt3 \num trace(\sym) smp_trace(\sym)
.endm
#endif
/* Make sure APIC interrupt handlers end up in the irqentry section: */
#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
# define PUSH_SECTION_IRQENTRY .pushsection .irqentry.text, "ax"
# define POP_SECTION_IRQENTRY .popsection
#else
# define PUSH_SECTION_IRQENTRY
# define POP_SECTION_IRQENTRY
#endif
.macro apicinterrupt num sym do_sym
PUSH_SECTION_IRQENTRY
apicinterrupt3 \num \sym \do_sym
trace_apicinterrupt \num \sym
POP_SECTION_IRQENTRY
.endm
#ifdef CONFIG_SMP