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2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
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* kdb helper for dumping the ftrace buffer
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*
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* Copyright (C) 2010 Jason Wessel <jason.wessel@windriver.com>
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*
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* ftrace_dump_buf based on ftrace_dump:
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* Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
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* Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
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*
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*/
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#include <linux/init.h>
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#include <linux/kgdb.h>
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#include <linux/kdb.h>
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#include <linux/ftrace.h>
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#include "trace.h"
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#include "trace_output.h"
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static void ftrace_dump_buf(int skip_lines, long cpu_file)
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{
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/* use static because iter can be a bit big for the stack */
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static struct trace_iterator iter;
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static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS];
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struct trace_array *tr;
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unsigned int old_userobj;
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int cnt = 0, cpu;
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trace_init_global_iter(&iter);
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iter.buffer_iter = buffer_iter;
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tr = iter.tr;
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for_each_tracing_cpu(cpu) {
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atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
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}
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old_userobj = tr->trace_flags;
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/* don't look at user memory in panic mode */
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tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
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kdb_printf("Dumping ftrace buffer:\n");
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/* reset all but tr, trace, and overruns */
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memset(&iter.seq, 0,
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sizeof(struct trace_iterator) -
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offsetof(struct trace_iterator, seq));
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iter.iter_flags |= TRACE_FILE_LAT_FMT;
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iter.pos = -1;
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if (cpu_file == RING_BUFFER_ALL_CPUS) {
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for_each_tracing_cpu(cpu) {
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iter.buffer_iter[cpu] =
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ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu);
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ring_buffer_read_start(iter.buffer_iter[cpu]);
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tracing_iter_reset(&iter, cpu);
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}
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} else {
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iter.cpu_file = cpu_file;
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iter.buffer_iter[cpu_file] =
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ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu_file);
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ring_buffer_read_start(iter.buffer_iter[cpu_file]);
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tracing_iter_reset(&iter, cpu_file);
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}
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while (trace_find_next_entry_inc(&iter)) {
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if (!cnt)
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kdb_printf("---------------------------------\n");
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cnt++;
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if (!skip_lines) {
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print_trace_line(&iter);
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trace_printk_seq(&iter.seq);
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} else {
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skip_lines--;
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}
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if (KDB_FLAG(CMD_INTERRUPT))
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goto out;
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}
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if (!cnt)
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kdb_printf(" (ftrace buffer empty)\n");
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else
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kdb_printf("---------------------------------\n");
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out:
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tr->trace_flags = old_userobj;
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for_each_tracing_cpu(cpu) {
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atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
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}
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for_each_tracing_cpu(cpu) {
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if (iter.buffer_iter[cpu]) {
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ring_buffer_read_finish(iter.buffer_iter[cpu]);
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iter.buffer_iter[cpu] = NULL;
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}
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}
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}
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/*
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* kdb_ftdump - Dump the ftrace log buffer
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*/
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static int kdb_ftdump(int argc, const char **argv)
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{
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int skip_lines = 0;
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long cpu_file;
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char *cp;
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if (argc > 2)
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return KDB_ARGCOUNT;
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if (argc) {
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skip_lines = simple_strtol(argv[1], &cp, 0);
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if (*cp)
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skip_lines = 0;
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}
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if (argc == 2) {
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cpu_file = simple_strtol(argv[2], &cp, 0);
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if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 ||
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!cpu_online(cpu_file))
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return KDB_BADINT;
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} else {
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cpu_file = RING_BUFFER_ALL_CPUS;
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}
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kdb_trap_printk++;
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ftrace_dump_buf(skip_lines, cpu_file);
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kdb_trap_printk--;
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return 0;
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}
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static __init int kdb_ftrace_register(void)
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{
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kdb_register_flags("ftdump", kdb_ftdump, "[skip_#lines] [cpu]",
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"Dump ftrace log", 0, KDB_ENABLE_ALWAYS_SAFE);
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return 0;
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}
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late_initcall(kdb_ftrace_register);
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