Alexei Starovoitov 8d3b7dce86 bpf: add support for %s specifier to bpf_trace_printk() ...

%s specifier makes bpf program and kernel debugging easier.
To make sure that trace_printk won't crash the unsafe string
is copied into stack and unsafe pointer is substituted.

The following C program:
 #include <linux/fs.h>
int foo(struct pt_regs *ctx, struct filename *filename)
{
  void *name = 0;

  bpf_probe_read(&name, sizeof(name), &filename->name);
  bpf_trace_printk("executed %s\n", name);
  return 0;
}

when attached to kprobe do_execve()
will produce output in /sys/kernel/debug/tracing/trace_pipe :
    make-13492 [002] d..1  3250.997277: : executed /bin/sh
      sh-13493 [004] d..1  3250.998716: : executed /usr/bin/gcc
     gcc-13494 [002] d..1  3250.999822: : executed /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1
     gcc-13495 [002] d..1  3251.006731: : executed /usr/bin/as
     gcc-13496 [002] d..1  3251.011831: : executed /usr/lib/gcc/x86_64-linux-gnu/4.7/collect2
collect2-13497 [000] d..1  3251.012941: : executed /usr/bin/ld

Suggested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2015-08-28 16:27:27 -07:00

..

blktrace.c

Merge tag 'trace-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-06-26 14:02:43 -07:00

bpf_trace.c

bpf: add support for %s specifier to bpf_trace_printk()

2015-08-28 16:27:27 -07:00

ftrace.c

ftrace: Fix breakage of set_ftrace_pid

2015-07-24 13:58:14 -04:00

Kconfig

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-04-14 14:37:47 -07:00

Makefile

bpf: Fix the build on BPF_SYSCALL=y && !CONFIG_TRACING kernels, make it more configurable

2015-04-02 16:28:06 +02:00

power-traces.c

PM / sleep: export suspend_resume trace event

2015-01-30 02:10:41 +01:00

ring_buffer_benchmark.c

Merge tag 'trace-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-06-26 14:02:43 -07:00

ring_buffer.c

ring-buffer: Add enum names for the context levels

2015-05-29 10:39:08 -04:00

rpm-traces.c

PM / Runtime: Introduce trace points for tracing rpm_* functions

2011-09-27 22:53:27 +02:00

trace_benchmark.c

tracing: Only calculate stats of tracepoint benchmarks for 2^32 times

2014-06-06 00:41:38 -04:00

trace_benchmark.h

tracing: Add tracepoint benchmark tracepoint

2014-05-29 22:49:54 -04:00

trace_branch.c

tracing: Have branch tracer use recursive field of task struct

2015-07-08 11:53:45 -04:00

trace_clock.c

tracing: Export tracing clock functions

2015-05-12 15:56:57 -04:00

trace_entries.h

tracing: %pF is only for function pointers

2015-03-25 08:57:22 -04:00

trace_event_perf.c

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_events_filter_test.h

tracing/filter: Add startup tests for events filter

2011-08-19 14:35:59 -04:00

trace_events_filter.c

Merge tag 'trace-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-06-26 14:02:43 -07:00

trace_events_trigger.c

tracing: Rename ftrace_raw_##call event structures to trace_event_raw_##call

2015-05-13 21:48:40 -04:00

trace_events.c

tracing: Rename FTRACE_EVENT_FL_* flags to EVENT_FILE_FL_*

2015-05-13 15:24:57 -04:00

trace_export.c

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_functions_graph.c

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_functions.c

tracing/trivial: Fix typos and make an int into a bool

2014-11-20 10:05:36 -05:00

trace_irqsoff.c

tracing: Remove unneeded includes of debugfs.h and fs.h

2015-01-22 11:19:48 -05:00

trace_kdb.c

Merge tag 'for_linus-3.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

2015-01-09 20:51:10 -08:00

trace_kprobe.c

lib: introduce strncpy_from_unsafe()

2015-08-28 16:27:27 -07:00

trace_mmiotrace.c

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_nop.c

tracing: Remove unneeded includes of debugfs.h and fs.h

2015-01-22 11:19:48 -05:00

trace_output.c

tracing: Rename ftrace_event_name() to trace_event_name()

2015-05-13 14:20:14 -04:00

trace_output.h

tracing: Rename (un)register_ftrace_event() to (un)register_trace_event()

2015-05-13 14:05:14 -04:00

trace_printk.c

tracing: Use IS_ERR() check for return value of tracing_init_dentry()

2015-01-22 11:19:49 -05:00

trace_probe.c

trace: Don't use __weak in header files

2015-03-25 08:57:23 -04:00

trace_probe.h

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_sched_switch.c

tracing: Remove unneeded includes of debugfs.h and fs.h

2015-01-22 11:19:48 -05:00

trace_sched_wakeup.c

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_selftest_dynamic.c

ftrace: Add self-tests for multiple function trace users

2011-05-18 19:24:51 -04:00

trace_selftest.c

Merge tag 'trace-3.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2014-10-12 07:28:55 -04:00

trace_seq.c

tracing: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

trace_stack.c

tracing: remove use of seq_printf return value

2015-04-15 16:35:25 -07:00

trace_stat.c

tracing: Convert the tracing facility over to use tracefs

2015-02-03 12:48:41 -05:00

trace_stat.h

…

trace_syscalls.c

tracing: Rename ftrace_trigger_soft_disabled() to trace_trigger_soft_disabled()

2015-05-13 15:25:39 -04:00

trace_uprobe.c

tracing: Rename ftrace_trigger_soft_disabled() to trace_trigger_soft_disabled()

2015-05-13 15:25:39 -04:00

trace.c

tracing: Rename FTRACE_EVENT_FL_* flags to EVENT_FILE_FL_*

2015-05-13 15:24:57 -04:00

trace.h

tracing: Have branch tracer use recursive field of task struct

2015-07-08 11:53:45 -04:00