Commit-ID: 74ebb63e7cd25f6fb02a45fc2ea7735bce1217c9
Gitweb: http://git.kernel.org/tip/74ebb63e7cd25f6fb02a45fc2ea7735bce1217c9
Author: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
AuthorDate: Mon, 14 Sep 2009 16:49:28 -0400
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Thu, 17 Sep 2009 04:03:57 +0200
tracing/kprobes: Fix profiling alignment for perf_counter buffer
Fix *probe_profile_func() to align buffer size, since perf_counter
requires its buffer entries to be 8 bytes aligned.
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Jim Keniston <jkenisto@xxxxxxxxxx>
Cc: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Frank Ch. Eigler <fche@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Cc: K.Prasad <prasad@xxxxxxxxxxxxxxxxxx>
Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
LKML-Reference: <20090914204928.18779.60029.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
kernel/trace/trace_kprobe.c | 17 ++++++++++++-----
1 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 70b632c..d8db935 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1149,18 +1149,23 @@ static __kprobes int kprobe_profile_func(struct kprobe *kp,
struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
struct ftrace_event_call *call = &tp->call;
struct kprobe_trace_entry *entry;
- int size, i, pc;
+ int size, __size, i, pc;
unsigned long irq_flags;
local_save_flags(irq_flags);
pc = preempt_count();
- size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
+ __size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
+ size = ALIGN(__size + sizeof(u32), sizeof(u64));
+ size -= sizeof(u32);
do {
char raw_data[size];
struct trace_entry *ent;
-
+ /*
+ * Zero dead bytes from alignment to avoid stack leak
+ * to userspace
+ */
*(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL;
entry = (struct kprobe_trace_entry *)raw_data;
ent = &entry->ent;
@@ -1183,13 +1188,15 @@ static __kprobes int kretprobe_profile_func(struct kretprobe_instance *ri,
struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
struct ftrace_event_call *call = &tp->call;
struct kretprobe_trace_entry *entry;
- int size, i, pc;
+ int size, __size, i, pc;
unsigned long irq_flags;
local_save_flags(irq_flags);
pc = preempt_count();
- size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
+ __size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
+ size = ALIGN(__size + sizeof(u32), sizeof(u64));
+ size -= sizeof(u32);
do {
char raw_data[size];
--
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