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arm64: __show_regs: Only resolve kernel symbols when running at EL1 

commit a06f818a70de21b4b3b4186816094208fc7accf9 upstream.

__show_regs pretty prints PC and LR by attempting to map them to kernel
function names to improve the utility of crash reports. Unfortunately,
this mapping is applied even when the pt_regs corresponds to user mode,
resulting in a KASLR oracle.

Avoid this issue by only looking up the function symbols when the register
state indicates that we're actually running at EL1.

Reported-by: NCSC Security <security@ncsc.gov.uk>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Will Deacon 2018-02-19 16:46:57 +00:00 committed by syphyr
parent 5c3425f482
commit 4f660ca136
1 changed files with 9 additions and 2 deletions
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11
arch/arm64/kernel/process.c
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@ -273,8 +273,15 @@ void __show_regs(struct pt_regs *regs)
}
show_regs_print_info(KERN_DEFAULT);
printk("pc : %pS\n", (void *)regs->pc);
printk("lr : %pS\n", (void *)lr);
if (!user_mode(regs)) {
printk("pc : %pS\n", (void *)regs->pc);
printk("lr : %pS\n", (void *)lr);
} else {
printk("pc : %016llx\n", regs->pc);
printk("lr : %016llx\n", lr);
}
printk("sp : %016llx pstate : %08llx\n", sp, regs->pstate);
for (i = top_reg; i >= 0; i--) {
printk("x%-2d: %016llx ", i, regs->regs[i]);