tracing: Fix crash from reading trace_pipe with sendfile

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commit a29054d947 upstream.

If tracing contains data and the trace_pipe file is read with sendfile(),
then it can trigger a NULL pointer dereference and various BUG_ON within the
VM code.

There's a patch to fix this in the splice_to_pipe() code, but it's also a
good idea to not let that happen from trace_pipe either.

Link: http://lkml.kernel.org/r/1457641146-9068-1-git-send-email-rabin@rab.in

Reported-by: Rabin Vincent <rabin.vincent@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Steven Rostedt (Red Hat) 2016-03-18 15:46:48 -04:00 • committed by Ben Hutchings

parent 5083db7727

commit 906dbf0d24

1 changed files with 4 additions and 1 deletions

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kernel/trace/trace.c

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