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authorThomas Gleixner <tglx@linutronix.de>2020-06-10 08:37:01 +0200
committerThomas Gleixner <tglx@linutronix.de>2020-06-11 15:15:29 +0200
commitf0178fc01fe46bab6a95415f5647d1a74efcad1b (patch)
treebf263d8cacf2ada33dea4cbc16ee5fd46b0109d4 /include
parentx86/entry: __always_inline CR2 for noinstr (diff)
downloadlinux-f0178fc01fe46bab6a95415f5647d1a74efcad1b.tar.xz
linux-f0178fc01fe46bab6a95415f5647d1a74efcad1b.zip
x86/entry: Unbreak __irqentry_text_start/end magic
The entry rework moved interrupt entry code from the irqentry to the noinstr section which made the irqentry section empty. This breaks boundary checks which rely on the __irqentry_text_start/end markers to find out whether a function in a stack trace is interrupt/exception entry code. This affects the function graph tracer and filter_irq_stacks(). As the IDT entry points are all sequentialy emitted this is rather simple to unbreak by injecting __irqentry_text_start/end as global labels. To make this work correctly: - Remove the IRQENTRY_TEXT section from the x86 linker script - Define __irqentry so it breaks the build if it's used - Adjust the entry mirroring in PTI - Remove the redundant kprobes and unwinder bound checks Reported-by: Qian Cai <cai@lca.pw> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/interrupt.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 80f637c3a6f3..5db970b6615a 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -760,8 +760,10 @@ extern int arch_early_irq_init(void);
/*
* We want to know which function is an entrypoint of a hardirq or a softirq.
*/
-#define __irq_entry __attribute__((__section__(".irqentry.text")))
-#define __softirq_entry \
- __attribute__((__section__(".softirqentry.text")))
+#ifndef __irq_entry
+# define __irq_entry __attribute__((__section__(".irqentry.text")))
+#endif
+
+#define __softirq_entry __attribute__((__section__(".softirqentry.text")))
#endif