linux-kernel - [PATCH 0/3] tracing/filter: make filter_pred_pchar() survive the access to user space

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Message-Id: <20220107044951.22080-1-kernelfans@gmail.com>
Date:   Fri,  7 Jan 2022 12:49:48 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Pingfan Liu <kernelfans@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 0/3] tracing/filter: make filter_pred_pchar() survive the access to user space

When
  echo "filename ~ \"cpu\"" > events/syscalls/sys_enter_openat/filter
  echo 1 > events/syscalls/sys_enter_at/enable
    
The kernel will run into a #PF (see [3/3].
This series resorts to copy_from_user() to cope with the access to user
space.

Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
To: linux-kernel@...r.kernel.org


Pingfan Liu (3):
  tracing/filter: degrade addr in filter_pred_string() from double
    pointer to pointer
  tracing/filter: harden the prototype of predicate_parse()
  tracing/filter: make filter_pred_pchar() survive the access to user
    space

 kernel/trace/trace.h               |  1 +
 kernel/trace/trace_events_filter.c | 38 ++++++++++++++++++++++++------
 2 files changed, 32 insertions(+), 7 deletions(-)

-- 
2.31.1