Dump out the KASLR virtual kernel offset when panic to help debug kernel. Signed-off-by: Zong Li <zong.li@xxxxxxxxxx> Signed-off-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx> --- arch/riscv/kernel/setup.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 376d2827e736..c6937839bbd8 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -20,6 +20,7 @@ #include <linux/smp.h> #include <linux/efi.h> #include <linux/crash_dump.h> +#include <linux/panic_notifier.h> #include <asm/alternative.h> #include <asm/cacheflush.h> @@ -333,3 +334,27 @@ void free_initmem(void) free_initmem_default(POISON_FREE_INITMEM); } + +static int dump_kernel_offset(struct notifier_block *self, + unsigned long v, void *p) +{ + pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", + kernel_map.virt_offset, + KERNEL_LINK_ADDR); + + return 0; +} + +static struct notifier_block kernel_offset_notifier = { + .notifier_call = dump_kernel_offset +}; + +static int __init register_kernel_offset_dumper(void) +{ + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) + atomic_notifier_chain_register(&panic_notifier_list, + &kernel_offset_notifier); + + return 0; +} +device_initcall(register_kernel_offset_dumper); -- 2.37.2