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Message-Id: <1513654094-16832-1-git-send-email-me@tobin.cc>
Date: Tue, 19 Dec 2017 14:28:11 +1100
From: "Tobin C. Harding" <me@...in.cc>
To: kernel-hardening@...ts.openwall.com
Cc: "Tobin C. Harding" <me@...in.cc>,
Steven Rostedt <rostedt@...dmis.org>,
Tycho Andersen <tycho@...ho.ws>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Daniel Borkmann <daniel@...earbox.net>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Alexei Starovoitov <ast@...nel.org>,
linux-kernel@...r.kernel.org,
Network Development <netdev@...r.kernel.org>
Subject: [PATCH v2 0/3] kallsyms: don't leak address
This set plugs a kernel address leak that occurs if kallsyms symbol
look up fails. This set was prompted by a leaking address found using
scripts/leaking_addresses.pl on a PowerPC machine in the wild.
$ perl scripts/leaking_addresses.pl [address sanitized]
...
/proc/8025/task/8025/stack: [<0000000000000000>] 0xc0000001XXXXXXXX
$ uname -r
4.4.0-79-powerpc64-smp
Patch set does not change behaviour when KALLSYMS is not defined
(suggested by Linus).
Comments on version 1 indicated that current behaviour may be useful for
debugging. This version adds a kernel command-line parameter in order to
be able to preserve current behaviour (print raw address if kallsyms
symbol look up fails). (Command-line parameter suggested by Steve.)
New command-line parameter is documented only in the kernel-doc for
kallsyms functions sprint_symbol() and sprint_symbol_no_offset(). Is
this sufficient? Perhaps an entry in printk-formats.txt also?
Patch 1 - return error code if symbol look up fails unless new
command-line parameter 'insecure_print_all_symbols' is enabled.
Patch 2 - print <symbol not found> to buffer if symbol look up returns
an error.
Patch 3 - maintain current behaviour in ftrace.
thanks,
Tobin.
v2:
- Add kernel command-line parameter.
- Remove unnecessary function.
- Fix broken ftrace code (and actually build and test ftrace code).
Patch 1 and 2 tested. Patch 3 (ftrace) tested but not all code paths
executed (discussed with Steve in another thread).
Tobin C. Harding (3):
kallsyms: don't leak address when symbol not found
vsprintf: print <no-symbol> if symbol not found
trace: print address if symbol not found
kernel/kallsyms.c | 31 +++++++++++++++++++++++++------
kernel/trace/trace.h | 24 ++++++++++++++++++++++++
kernel/trace/trace_events_hist.c | 6 +++---
kernel/trace/trace_output.c | 2 +-
lib/vsprintf.c | 11 ++++++++---
5 files changed, 61 insertions(+), 13 deletions(-)
--
2.7.4
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