linux-kernel - Re: [PATCH] kallsyms: don't leak address when printing symbol

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Date:   Wed, 8 Nov 2017 22:35:55 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Tobin C. Harding" <me@...in.cc>
Cc:     kernel-hardening@...ts.openwall.com,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Theodore Ts'o <tytso@....edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tycho Andersen <tycho@...ker.com>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        Tejun Heo <tj@...nel.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <wil.deacon@....com>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kallsyms: don't leak address when printing symbol

On Thu,  9 Nov 2017 12:50:29 +1100
"Tobin C. Harding" <me@...in.cc> wrote:

> Currently if a pointer is printed using %p[ssB] and the symbol is not
> found (kallsyms_lookup() fails) then we print the actual address. This
> leaks kernel addresses. We should instead print something _safe_.
> 
> Print "<no-symbol>" instead of kernel address.

Ug, ftrace requires this to work as is, as it uses it to print some
addresses that may or may not be a symbol.

If anything, can this return a success or failure if it were to find a
symbol or not, and then something like ftrace could decide to use %x if
it does not.

And yes, ftrace leaks kernel addresses all over the place, that's just
the nature of tracing the kernel.

-- Steve


> 
> Signed-off-by: Tobin C. Harding <me@...in.cc>
> ---
>  kernel/kallsyms.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
> index 127e7cfafa55..182e7592be9c 100644
> --- a/kernel/kallsyms.c
> +++ b/kernel/kallsyms.c
> @@ -390,7 +390,7 @@ static int __sprint_symbol(char *buffer, unsigned long address,
>  	address += symbol_offset;
>  	name = kallsyms_lookup(address, &size, &offset, &modname, buffer);
>  	if (!name)
> -		return sprintf(buffer, "0x%lx", address - symbol_offset);
> +		return sprintf(buffer, "<no-symbol>");
>  
>  	if (name != buffer)
>  		strcpy(buffer, name);