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arm64: traps: Don't print stack or raw PC/LR values in backtraces

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Printing raw pointer values in backtraces has potential security
implications and are of questionable value anyway.

This patch follows x86's lead and removes the "Exception stack:" dump
from kernel backtraces, as well as converting PC/LR values to symbols
such as "sysrq_handle_crash+0x20/0x30".

Tested-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2017-10-19 13:19:20 +01:00
parent 42dbf54e88
commit a25ffd3a63
2 changed files with 6 additions and 67 deletions
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8
arch/arm64/kernel/process.c
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@@ -186,11 +186,9 @@ void __show_regs(struct pt_regs *regs)
}
show_regs_print_info(KERN_DEFAULT);
print_symbol("PC is at %s\n", instruction_pointer(regs));
print_symbol("LR is at %s\n", lr);
printk("pc : [<%016llx>] lr : [<%016llx>] pstate: %08llx\n",
regs->pc, lr, regs->pstate);
printk("sp : %016llx\n", sp);
print_symbol("pc : %s\n", regs->pc);
print_symbol("lr : %s\n", lr);
printk("sp : %016llx pstate : %08llx\n", sp, regs->pstate);
i = top_reg;