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Subject[kernel-hardening] [RFC V2 2/6] lib: vsprintf: whitelist stack traces
Date
Use the %pP functionality to explicitly allow kernel
pointers to be logged for stack traces.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
---
arch/arm64/kernel/traps.c | 4 ++--
kernel/printk/printk.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 5ea4b85..fe09660 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -147,7 +147,7 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
struct stackframe frame;
int skip;

- pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
+ pr_debug("%s(regs = %pP tsk = %pP)\n", __func__, regs, tsk);

if (!tsk)
tsk = current;
@@ -233,7 +233,7 @@ static int __die(const char *str, int err, struct pt_regs *regs)

print_modules();
__show_regs(regs);
- pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
+ pr_emerg("Process %.*s (pid: %d, stack limit = 0x%pP)\n",
TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk),
end_of_stack(tsk));

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 512f7c2..af0bc8e 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3142,7 +3142,7 @@ void show_regs_print_info(const char *log_lvl)
{
dump_stack_print_info(log_lvl);

- printk("%stask: %p task.stack: %p\n",
+ printk("%stask: %pP task.stack: %pP\n",
log_lvl, current, task_stack_page(current));
}

--
2.7.4
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