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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-15 21:47:02 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-15 21:47:02 (GMT)
commitaa2e3ac64ace127f403be85aa4d6015b859385f2 (patch)
treed2b7fea0f3bff7916496c5204bd601bb96ea44fd
parent323ea40ff6fb1e9d2c481bff50245ee5f559c8af (diff)
parenta039480e9e93896cadc5a91468964febb3c5d488 (diff)
Merge tag 'trace-v5.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes and cleanups from Steven Rostedt: "This contains a series of last minute clean ups, small fixes and error checks" * tag 'trace-v5.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing/probe: Verify alloc_trace_*probe() result tracing/probe: Check event/group naming rule at parsing tracing/probe: Check the size of argument name and body tracing/probe: Check event name length correctly tracing/probe: Check maxactive error cases tracing: kdb: Fix ftdump to not sleep trace/probes: Remove kernel doc style from non kernel doc comment tracing/probes: Make reserved_field_names static
-rw-r--r--include/linux/ring_buffer.h2
-rw-r--r--kernel/trace/ring_buffer.c5
-rw-r--r--kernel/trace/trace.c6
-rw-r--r--kernel/trace/trace_kdb.c6
-rw-r--r--kernel/trace/trace_kprobe.c23
-rw-r--r--kernel/trace/trace_probe.c20
-rw-r--r--kernel/trace/trace_probe.h1
-rw-r--r--kernel/trace/trace_uprobe.c8
8 files changed, 45 insertions, 26 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index f142967..1a40277 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -128,7 +128,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts,
unsigned long *lost_events);
struct ring_buffer_iter *
-ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu);
+ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu, gfp_t flags);
void ring_buffer_read_prepare_sync(void);
void ring_buffer_read_start(struct ring_buffer_iter *iter);
void ring_buffer_read_finish(struct ring_buffer_iter *iter);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 9a91479..41b6f96 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4191,6 +4191,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_consume);
* ring_buffer_read_prepare - Prepare for a non consuming read of the buffer
* @buffer: The ring buffer to read from
* @cpu: The cpu buffer to iterate over
+ * @flags: gfp flags to use for memory allocation
*
* This performs the initial preparations necessary to iterate
* through the buffer. Memory is allocated, buffer recording
@@ -4208,7 +4209,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_consume);
* This overall must be paired with ring_buffer_read_finish.
*/
struct ring_buffer_iter *
-ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu)
+ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu, gfp_t flags)
{
struct ring_buffer_per_cpu *cpu_buffer;
struct ring_buffer_iter *iter;
@@ -4216,7 +4217,7 @@ ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu)
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return NULL;
- iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+ iter = kmalloc(sizeof(*iter), flags);
if (!iter)
return NULL;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 94ffc1c..21153e6 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4079,7 +4079,8 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot)
if (iter->cpu_file == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu) {
iter->buffer_iter[cpu] =
- ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
+ ring_buffer_read_prepare(iter->trace_buffer->buffer,
+ cpu, GFP_KERNEL);
}
ring_buffer_read_prepare_sync();
for_each_tracing_cpu(cpu) {
@@ -4089,7 +4090,8 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot)
} else {
cpu = iter->cpu_file;
iter->buffer_iter[cpu] =
- ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
+ ring_buffer_read_prepare(iter->trace_buffer->buffer,
+ cpu, GFP_KERNEL);
ring_buffer_read_prepare_sync();
ring_buffer_read_start(iter->buffer_iter[cpu]);
tracing_iter_reset(iter, cpu);
diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
index d953c16..810d78a 100644
--- a/kernel/trace/trace_kdb.c
+++ b/kernel/trace/trace_kdb.c
@@ -51,14 +51,16 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
if (cpu_file == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu) {
iter.buffer_iter[cpu] =
- ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu);
+ ring_buffer_read_prepare(iter.trace_buffer->buffer,
+ cpu, GFP_ATOMIC);
ring_buffer_read_start(iter.buffer_iter[cpu]);
tracing_iter_reset(&iter, cpu);
}
} else {
iter.cpu_file = cpu_file;
iter.buffer_iter[cpu_file] =
- ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu_file);
+ ring_buffer_read_prepare(iter.trace_buffer->buffer,
+ cpu_file, GFP_ATOMIC);
ring_buffer_read_start(iter.buffer_iter[cpu_file]);
tracing_iter_reset(&iter, cpu_file);
}
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 99592c2..5d5129b 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -35,7 +35,7 @@ static struct dyn_event_operations trace_kprobe_ops = {
.match = trace_kprobe_match,
};
-/**
+/*
* Kprobe event core functions
*/
struct trace_kprobe {
@@ -221,7 +221,7 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
tk->rp.maxactive = maxactive;
- if (!event || !is_good_name(event)) {
+ if (!event || !group) {
ret = -EINVAL;
goto error;
}
@@ -231,11 +231,6 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
if (!tk->tp.call.name)
goto error;
- if (!group || !is_good_name(group)) {
- ret = -EINVAL;
- goto error;
- }
-
tk->tp.class.system = kstrdup(group, GFP_KERNEL);
if (!tk->tp.class.system)
goto error;
@@ -624,7 +619,11 @@ static int trace_kprobe_create(int argc, const char *argv[])
if (event)
event++;
- if (is_return && isdigit(argv[0][1])) {
+ if (isdigit(argv[0][1])) {
+ if (!is_return) {
+ pr_info("Maxactive is not for kprobe");
+ return -EINVAL;
+ }
if (event)
len = event - &argv[0][1] - 1;
else
@@ -634,8 +633,8 @@ static int trace_kprobe_create(int argc, const char *argv[])
memcpy(buf, &argv[0][1], len);
buf[len] = '\0';
ret = kstrtouint(buf, 0, &maxactive);
- if (ret) {
- pr_info("Failed to parse maxactive.\n");
+ if (ret || !maxactive) {
+ pr_info("Invalid maxactive number\n");
return ret;
}
/* kretprobes instances are iterated over via a list. The
@@ -694,9 +693,9 @@ static int trace_kprobe_create(int argc, const char *argv[])
tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive,
argc, is_return);
if (IS_ERR(tk)) {
- pr_info("Failed to allocate trace_probe.(%d)\n",
- (int)PTR_ERR(tk));
ret = PTR_ERR(tk);
+ /* This must return -ENOMEM otherwise there is a bug */
+ WARN_ON_ONCE(ret != -ENOMEM);
goto out;
}
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 89da34b..8f8411e 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -13,7 +13,7 @@
#include "trace_probe.h"
-const char *reserved_field_names[] = {
+static const char *reserved_field_names[] = {
"common_type",
"common_flags",
"common_preempt_count",
@@ -159,6 +159,7 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
char *buf)
{
const char *slash, *event = *pevent;
+ int len;
slash = strchr(event, '/');
if (slash) {
@@ -171,12 +172,25 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
return -E2BIG;
}
strlcpy(buf, event, slash - event + 1);
+ if (!is_good_name(buf)) {
+ pr_info("Group name must follow the same rules as C identifiers\n");
+ return -EINVAL;
+ }
*pgroup = buf;
*pevent = slash + 1;
+ event = *pevent;
}
- if (strlen(event) == 0) {
+ len = strlen(event);
+ if (len == 0) {
pr_info("Event name is not specified\n");
return -EINVAL;
+ } else if (len > MAX_EVENT_NAME_LEN) {
+ pr_info("Event name is too long\n");
+ return -E2BIG;
+ }
+ if (!is_good_name(event)) {
+ pr_info("Event name must follow the same rules as C identifiers\n");
+ return -EINVAL;
}
return 0;
}
@@ -548,6 +562,8 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
body = strchr(arg, '=');
if (body) {
+ if (body - arg > MAX_ARG_NAME_LEN || body == arg)
+ return -EINVAL;
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
body++;
} else {
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 8a63f8b..2177c20 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -32,6 +32,7 @@
#define MAX_TRACE_ARGS 128
#define MAX_ARGSTR_LEN 63
#define MAX_ARRAY_LEN 64
+#define MAX_ARG_NAME_LEN 32
#define MAX_STRING_SIZE PATH_MAX
/* Reserved field names */
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 9bde07c..be78d99 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -273,10 +273,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
{
struct trace_uprobe *tu;
- if (!event || !is_good_name(event))
- return ERR_PTR(-EINVAL);
-
- if (!group || !is_good_name(group))
+ if (!event || !group)
return ERR_PTR(-EINVAL);
tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
@@ -524,8 +521,9 @@ static int trace_uprobe_create(int argc, const char **argv)
tu = alloc_trace_uprobe(group, event, argc, is_return);
if (IS_ERR(tu)) {
- pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu));
ret = PTR_ERR(tu);
+ /* This must return -ENOMEM otherwise there is a bug */
+ WARN_ON_ONCE(ret != -ENOMEM);
goto fail_address_parse;
}
tu->offset = offset;

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