Printing raw pointer values in backtraces has potential security implications and are of questionable value anyway.
This patch follows x86 and arm64's lead and removes the "Exception stack:" dump from kernel backtraces: commit a25ffd3a6302a6 ("arm64: traps: Don't print stack or raw PC/LR values in backtraces") commit 0ee1dd9f5e7eae ("x86/dumpstack: Remove raw stack dump") commit bb5e5ce545f203 ("x86/dumpstack: Remove kernel text addresses from stack dump") Signed-off-by: Xiaoming Ni <nixiaom...@huawei.com> --- arch/arm/kernel/process.c | 3 +-- arch/arm/kernel/traps.c | 12 +++++------- 2 files changed, 6 insertions(+), 9 deletions(-) diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 8e6ace03e960..71c9e5597d39 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -121,8 +121,7 @@ void __show_regs(struct pt_regs *regs) printk("PC is at %pS\n", (void *)instruction_pointer(regs)); printk("LR is at %pS\n", (void *)regs->ARM_lr); - printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n", - regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr); + printk("psr: %08lx\n", regs->ARM_cpsr); printk("sp : %08lx ip : %08lx fp : %08lx\n", regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); printk("r10: %08lx r9 : %08lx r8 : %08lx\n", diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 17d5a785df28..b0b188e01070 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -60,23 +60,18 @@ static int __init user_debug_setup(char *str) __setup("user_debug=", user_debug_setup); #endif -static void dump_mem(const char *, const char *, unsigned long, unsigned long); - void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame, const char *loglvl) { unsigned long end = frame + 4 + sizeof(struct pt_regs); #ifdef CONFIG_KALLSYMS - printk("%s[<%08lx>] (%ps) from [<%08lx>] (%pS)\n", - loglvl, where, (void *)where, from, (void *)from); + printk("%s (%ps) from (%pS)\n", + loglvl, (void *)where, (void *)from); #else printk("%sFunction entered at [<%08lx>] from [<%08lx>]\n", loglvl, where, from); #endif - - if (in_entry_text(from) && end <= ALIGN(frame, THREAD_SIZE)) - dump_mem(loglvl, "Exception stack", frame + 4, end); } void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl) @@ -125,6 +120,9 @@ static void dump_mem(const char *lvl, const char *str, unsigned long bottom, mm_segment_t fs; int i; + /* Do not print virtual addresses in non-reset scenarios */ + if (!panic_on_oops) + return; /* * We need to switch to kernel mode so that we can use __get_user * to safely read from kernel space. Note that we now dump the -- 2.27.0