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| author | Oleg Nesterov <oleg@redhat.com> | 2013-11-26 09:35:25 +0900 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-01-02 20:57:04 -0500 |
| commit | 72fd293aa9ae8f4f48d6042be43fe81551c639f2 (patch) | |
| tree | 44216969149d0d1e7f022796decae3a13c9d64fa /kernel/events/uprobes.c | |
| parent | b079d374fd84637aba4b825a329e794990b7b486 (diff) | |
| download | linux-72fd293aa9ae8f4f48d6042be43fe81551c639f2.tar.gz linux-72fd293aa9ae8f4f48d6042be43fe81551c639f2.tar.bz2 linux-72fd293aa9ae8f4f48d6042be43fe81551c639f2.zip | |
uprobes: Allocate ->utask before handler_chain() for tracing handlers
uprobe_trace_print() and uprobe_perf_print() need to pass the additional
info to call_fetch() methods, currently there is no simple way to do this.
current->utask looks like a natural place to hold this info, but we need
to allocate it before handler_chain().
This is a bit unfortunate, perhaps we will find a better solution later,
but this is simple and should work right now.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'kernel/events/uprobes.c')
| -rw-r--r-- | kernel/events/uprobes.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 24b7d6ca871b..3cc8e0bb8acf 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1828,6 +1828,10 @@ static void handle_swbp(struct pt_regs *regs) if (unlikely(!test_bit(UPROBE_COPY_INSN, &uprobe->flags))) goto out; + /* Tracing handlers use ->utask to communicate with fetch methods */ + if (!get_utask()) + goto out; + handler_chain(uprobe, regs); if (can_skip_sstep(uprobe, regs)) goto out; |