mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
b9b76dfaac
BUG: unable to handle kernel NULL pointer dereference at 0000000000000006 IP: [<ffffffff8107bd37>] ftrace_raw_event_signal_generate+0x87/0x140 TP_STORE_SIGINFO() forgets about SEND_SIG_FORCED, fix. We should probably export is_si_special() and change TP_STORE_SIGINFO() to use it in the longer term. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Roland McGrath <roland@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: 2.6.33.x-2.6.34.x <stable@kernel.org> LKML-Reference: <20100603213409.GA8307@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
#undef TRACE_SYSTEM
|
|
#define TRACE_SYSTEM signal
|
|
|
|
#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
|
|
#define _TRACE_SIGNAL_H
|
|
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/tracepoint.h>
|
|
|
|
#define TP_STORE_SIGINFO(__entry, info) \
|
|
do { \
|
|
if (info == SEND_SIG_NOINFO || \
|
|
info == SEND_SIG_FORCED) { \
|
|
__entry->errno = 0; \
|
|
__entry->code = SI_USER; \
|
|
} else if (info == SEND_SIG_PRIV) { \
|
|
__entry->errno = 0; \
|
|
__entry->code = SI_KERNEL; \
|
|
} else { \
|
|
__entry->errno = info->si_errno; \
|
|
__entry->code = info->si_code; \
|
|
} \
|
|
} while (0)
|
|
|
|
/**
|
|
* signal_generate - called when a signal is generated
|
|
* @sig: signal number
|
|
* @info: pointer to struct siginfo
|
|
* @task: pointer to struct task_struct
|
|
*
|
|
* Current process sends a 'sig' signal to 'task' process with
|
|
* 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
|
|
* 'info' is not a pointer and you can't access its field. Instead,
|
|
* SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
|
|
* means that si_code is SI_KERNEL.
|
|
*/
|
|
TRACE_EVENT(signal_generate,
|
|
|
|
TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
|
|
|
|
TP_ARGS(sig, info, task),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( int, sig )
|
|
__field( int, errno )
|
|
__field( int, code )
|
|
__array( char, comm, TASK_COMM_LEN )
|
|
__field( pid_t, pid )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->sig = sig;
|
|
TP_STORE_SIGINFO(__entry, info);
|
|
memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
|
|
__entry->pid = task->pid;
|
|
),
|
|
|
|
TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
|
|
__entry->sig, __entry->errno, __entry->code,
|
|
__entry->comm, __entry->pid)
|
|
);
|
|
|
|
/**
|
|
* signal_deliver - called when a signal is delivered
|
|
* @sig: signal number
|
|
* @info: pointer to struct siginfo
|
|
* @ka: pointer to struct k_sigaction
|
|
*
|
|
* A 'sig' signal is delivered to current process with 'info' siginfo,
|
|
* and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
|
|
* SIG_DFL.
|
|
* Note that some signals reported by signal_generate tracepoint can be
|
|
* lost, ignored or modified (by debugger) before hitting this tracepoint.
|
|
* This means, this can show which signals are actually delivered, but
|
|
* matching generated signals and delivered signals may not be correct.
|
|
*/
|
|
TRACE_EVENT(signal_deliver,
|
|
|
|
TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
|
|
|
|
TP_ARGS(sig, info, ka),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( int, sig )
|
|
__field( int, errno )
|
|
__field( int, code )
|
|
__field( unsigned long, sa_handler )
|
|
__field( unsigned long, sa_flags )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->sig = sig;
|
|
TP_STORE_SIGINFO(__entry, info);
|
|
__entry->sa_handler = (unsigned long)ka->sa.sa_handler;
|
|
__entry->sa_flags = ka->sa.sa_flags;
|
|
),
|
|
|
|
TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
|
|
__entry->sig, __entry->errno, __entry->code,
|
|
__entry->sa_handler, __entry->sa_flags)
|
|
);
|
|
|
|
DECLARE_EVENT_CLASS(signal_queue_overflow,
|
|
|
|
TP_PROTO(int sig, int group, struct siginfo *info),
|
|
|
|
TP_ARGS(sig, group, info),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( int, sig )
|
|
__field( int, group )
|
|
__field( int, errno )
|
|
__field( int, code )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->sig = sig;
|
|
__entry->group = group;
|
|
TP_STORE_SIGINFO(__entry, info);
|
|
),
|
|
|
|
TP_printk("sig=%d group=%d errno=%d code=%d",
|
|
__entry->sig, __entry->group, __entry->errno, __entry->code)
|
|
);
|
|
|
|
/**
|
|
* signal_overflow_fail - called when signal queue is overflow
|
|
* @sig: signal number
|
|
* @group: signal to process group or not (bool)
|
|
* @info: pointer to struct siginfo
|
|
*
|
|
* Kernel fails to generate 'sig' signal with 'info' siginfo, because
|
|
* siginfo queue is overflow, and the signal is dropped.
|
|
* 'group' is not 0 if the signal will be sent to a process group.
|
|
* 'sig' is always one of RT signals.
|
|
*/
|
|
DEFINE_EVENT(signal_queue_overflow, signal_overflow_fail,
|
|
|
|
TP_PROTO(int sig, int group, struct siginfo *info),
|
|
|
|
TP_ARGS(sig, group, info)
|
|
);
|
|
|
|
/**
|
|
* signal_lose_info - called when siginfo is lost
|
|
* @sig: signal number
|
|
* @group: signal to process group or not (bool)
|
|
* @info: pointer to struct siginfo
|
|
*
|
|
* Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
|
|
* queue is overflow.
|
|
* 'group' is not 0 if the signal will be sent to a process group.
|
|
* 'sig' is always one of non-RT signals.
|
|
*/
|
|
DEFINE_EVENT(signal_queue_overflow, signal_lose_info,
|
|
|
|
TP_PROTO(int sig, int group, struct siginfo *info),
|
|
|
|
TP_ARGS(sig, group, info)
|
|
);
|
|
|
|
#endif /* _TRACE_SIGNAL_H */
|
|
|
|
/* This part must be outside protection */
|
|
#include <trace/define_trace.h>
|