[kernel-hardening] [RFC V2 2/6] lib: vsprintf: whitelist stack traces

[Tobin C. Harding]

Use the %pP functionality to explicitly allow kernel
pointers to be logged for stack traces.

Signed-off-by: Tobin C. Harding <m...@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