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SubjectRe: [PATCH v2] x86/realmode: don't leak kernel addresses
On Sun, Mar 24, 2019 at 08:05:04PM +0100, Matteo Croce wrote:
> Since commit ad67b74d2469d9b8 ("printk: hash addresses printed with %p"),
> at boot "____ptrval____" is printed instead of the trampoline addresses:
>
> Base memory trampoline at [(____ptrval____)] 99000 size 24576
>
> Remove the address from the print as we don't want to leak kernel
> addresses.
>
> Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p")
> Signed-off-by: Matteo Croce <mcroce@redhat.com>
> ---
> arch/x86/realmode/init.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
> index d10105825d57..d76a1380ec37 100644
> --- a/arch/x86/realmode/init.c
> +++ b/arch/x86/realmode/init.c
> @@ -20,8 +20,8 @@ void __init set_real_mode_mem(phys_addr_t mem, size_t size)
> void *base = __va(mem);
>
> real_mode_header = (struct real_mode_header *) base;
> - printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
> - base, (unsigned long long)mem, size);
> + printk(KERN_DEBUG "Base memory trampoline at %llx size %zu\n",
> + (unsigned long long)mem, size);

In case this wasn't clear, please remove the whole printk. And don't
forget to CC lkml on your submissions. CCed now.

--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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