[PATCH v15 10/23] crash_core: Introduce CRASH_HOTPLUG_SAFETY_PADDING for memory hotplug safety
From: Jinjie Ruan <hidden>
Date: 2026-06-01 09:49:20
Also in:
kexec, linux-devicetree, linux-doc, linux-riscv, lkml, loongarch
Subsystem:
kdump, the rest · Maintainers:
Andrew Morton, Baoquan He, Mike Rapoport, Pasha Tatashin, Pratyush Yadav, Linus Torvalds
Introduce CRASH_HOTPLUG_SAFETY_PADDING to allocate extra slots for the crash memory ranges array, mitigating potential TOCTOU races caused by concurrent memory hotplug events. When CONFIG_MEMORY_HOTPLUG is disabled, the padding safely defaults to 0 as the memory layout remains static. Signed-off-by: Jinjie Ruan <redacted> --- include/linux/crash_core.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index c1dee3f971a9..d4762e000098 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h@@ -14,6 +14,12 @@ struct crash_mem { struct range ranges[] __counted_by(max_nr_ranges); }; +#ifdef CONFIG_MEMORY_HOTPLUG +#define CRASH_HOTPLUG_SAFETY_PADDING 128 +#else +#define CRASH_HOTPLUG_SAFETY_PADDING 0 +#endif + #ifdef CONFIG_CRASH_DUMP int crash_shrink_memory(unsigned long new_size);
--
2.34.1