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tracing/kprobes: Fix probe offset to be unsigned

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Prohibit user to specify negative offset from symbols.
Since kprobe.offset is unsigned int, the offset must be always positive
value.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <20090910235314.22412.64631.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Masami Hiramatsu 2009-09-10 19:53:14 -04:00 committed by Frederic Weisbecker
parent ad5cafcdb0
commit 2fba0c8867
2 changed files with 14 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
Documentation/trace/kprobetrace.txt
View file

@ -25,12 +25,12 @@ probe events via /sys/kernel/debug/tracing/events/kprobes/<EVENT>/filter.
Synopsis of kprobe_events
-------------------------
p[:EVENT] SYMBOL[+offs|-offs]|MEMADDR [FETCHARGS] : Set a probe
p[:EVENT] SYMBOL[+offs]|MEMADDR [FETCHARGS] : Set a probe
r[:EVENT] SYMBOL[+0] [FETCHARGS] : Set a return probe
EVENT : Event name. If omitted, the event name is generated
based on SYMBOL+offs or MEMADDR.
SYMBOL[+offs|-offs] : Symbol+offset where the probe is inserted.
SYMBOL[+offs] : Symbol+offset where the probe is inserted.
MEMADDR : Address where the probe is inserted.
FETCHARGS : Arguments. Each probe can have up to 128 args.

19
kernel/trace/trace_kprobe.c
View file

@ -210,7 +210,7 @@ static __kprobes const char *probe_symbol(struct trace_probe *tp)
return tp->symbol ? tp->symbol : "unknown";
}
static __kprobes long probe_offset(struct trace_probe *tp)
static __kprobes unsigned int probe_offset(struct trace_probe *tp)
{
return (probe_is_return(tp)) ? tp->rp.kp.offset : tp->kp.offset;
}
@ -380,7 +380,7 @@ end:
}
/* Split symbol and offset. */
static int split_symbol_offset(char *symbol, long *offset)
static int split_symbol_offset(char *symbol, unsigned long *offset)
{
char *tmp;
int ret;
@ -389,16 +389,11 @@ static int split_symbol_offset(char *symbol, long *offset)
return -EINVAL;
tmp = strchr(symbol, '+');
if (!tmp)
tmp = strchr(symbol, '-');
if (tmp) {
/* skip sign because strict_strtol doesn't accept '+' */
ret = strict_strtol(tmp + 1, 0, offset);
ret = strict_strtoul(tmp + 1, 0, offset);
if (ret)
return ret;
if (*tmp == '-')
*offset = -(*offset);
*tmp = '\0';
} else
*offset = 0;
@ -520,7 +515,7 @@ static int create_trace_probe(int argc, char **argv)
{
/*
* Argument syntax:
* - Add kprobe: p[:EVENT] SYMBOL[+OFFS|-OFFS]|ADDRESS [FETCHARGS]
* - Add kprobe: p[:EVENT] SYMBOL[+OFFS]|ADDRESS [FETCHARGS]
* - Add kretprobe: r[:EVENT] SYMBOL[+0] [FETCHARGS]
* Fetch args:
* aN : fetch Nth of function argument. (N:0-)
@ -539,7 +534,7 @@ static int create_trace_probe(int argc, char **argv)
int i, ret = 0;
int is_return = 0;
char *symbol = NULL, *event = NULL;
long offset = 0;
unsigned long offset = 0;
void *addr = NULL;
if (argc < 2)
@ -605,7 +600,7 @@ static int create_trace_probe(int argc, char **argv)
if (tp->symbol) {
kp->symbol_name = tp->symbol;
kp->offset = offset;
kp->offset = (unsigned int)offset;
} else
kp->addr = addr;
@ -675,7 +670,7 @@ static int probes_seq_show(struct seq_file *m, void *v)
seq_printf(m, ":%s", tp->call.name);
if (tp->symbol)
seq_printf(m, " %s%+ld", probe_symbol(tp), probe_offset(tp));
seq_printf(m, " %s+%u", probe_symbol(tp), probe_offset(tp));
else
seq_printf(m, " 0x%p", probe_address(tp));