From: Tom Zanussi <zanussi@kernel.org>
To: rostedt@goodmis.org
Cc: vincent@bernat.ch, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] tracing: Fix NULL pointer bug in hist key expressions
Date: Thu, 8 Nov 2018 08:41:47 -0600 [thread overview]
Message-ID: <cover.1541687121.git.tom.zanussi@linux.intel.com> (raw)
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Hi Steve,
This is a fix for a user-reported bug in the hist triggers, where if a
variable reference is used in an expression in a histogram key, it
results in a NULL pointer dereference and subsequent Oops.
I separated the fix into two small patches, the first preventing the
immediate problem bu disallowing a var_ref from ever accessing a NULL
element, and the second disallowing a user from ever constructing such
a key.
Thanks,
Tom
The following changes since commit ee474b81fe5aa5dc0faae920bf66240fbf55f891:
tracing/kprobes: Fix strpbrk() argument order (2018-11-05 09:47:14 -0500)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git ftrace/key-ref-fix
Tom Zanussi (2):
tracing: Prevent hist_field_var_ref() from accessing NULL
tracing_map_elts
tracing: Check keys for variable references in expressions too
kernel/trace/trace_events_hist.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--
2.14.1
next reply other threads:[~2018-11-08 14:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 14:41 Tom Zanussi [this message]
2018-11-08 14:41 ` [PATCH 1/2] tracing: Prevent hist_field_var_ref() from accessing NULL tracing_map_elts Tom Zanussi
2018-11-08 14:41 ` [PATCH 2/2] tracing: Check keys for variable references in expressions too Tom Zanussi
2018-11-08 18:45 ` [PATCH 0/2] tracing: Fix NULL pointer bug in hist key expressions Steven Rostedt
2018-11-08 19:12 ` Tom Zanussi
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