[PATCH 0/3] kallsyms: don't leak address

From: Tobin C. Harding
Date: Sun Dec 17 2017 - 18:53:57 EST

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.

Patch set does not change behaviour when KALLSYMS is not defined
(suggested by Linus).

RFC has been in flight for 3 weeks with no negative response.

Patch 1 - return error code if symbol look up fails.
Patch 2 - print <no-symbol> to buffer if symbol look up returns an error.
Patch 3 - maintain current behaviour in ftrace.

Patch 3 (the ftrace stuff) is untested.


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

include/linux/kernel.h | 2 ++
kernel/kallsyms.c | 6 ++++--
kernel/trace/trace.h | 24 ++++++++++++++++++++++++
kernel/trace/trace_events_hist.c | 6 +++---
lib/vsprintf.c | 18 +++++++++++++++---
5 files changed, 48 insertions(+), 8 deletions(-)