diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-06-10 08:37:01 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:15:29 +0200 |
| commit | f0178fc01fe46bab6a95415f5647d1a74efcad1b (patch) | |
| tree | bf263d8cacf2ada33dea4cbc16ee5fd46b0109d4 /arch/x86/kernel/vmlinux.lds.S | |
| parent | x86/entry: __always_inline CR2 for noinstr (diff) | |
| download | linux-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 'arch/x86/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/x86/kernel/vmlinux.lds.S | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 1bf7e312361f..b4c6b6f35548 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -134,7 +134,6 @@ SECTIONS KPROBES_TEXT ALIGN_ENTRY_TEXT_BEGIN ENTRY_TEXT - IRQENTRY_TEXT ALIGN_ENTRY_TEXT_END SOFTIRQENTRY_TEXT *(.fixup) |