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Probes fixes for v6.10-rc1:

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- uprobes: prevent mutex_lock() under rcu_read_lock(). Recent changes moves
   uprobe_cpu_buffer preparation which involves mutex_lock(), under
   __uprobe_trace_func() which is called inside rcu_read_lock(). Fix it
   by moving uprobe_cpu_buffer preparation outside of __uprobe_trace_func().
 
 - kprobe-events: Fix to handle the error case of btf_find_struct_member().
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Merge tag 'probes-fixes-v6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull probes fixes from Masami Hiramatsu:

 - uprobes: prevent mutex_lock() under rcu_read_lock().

   Recent changes moved uprobe_cpu_buffer preparation which involves
   mutex_lock(), under __uprobe_trace_func() which is called inside
   rcu_read_lock().

   Fix it by moving uprobe_cpu_buffer preparation outside of
   __uprobe_trace_func()

 - kprobe-events: handle the error case of btf_find_struct_member()

* tag 'probes-fixes-v6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing/probes: fix error check in parse_btf_field()
  uprobes: prevent mutex_lock() under rcu_read_lock()
This commit is contained in:
Linus Torvalds 2024-05-28 10:17:40 -07:00
commit 8d6bc6a2b1
2 changed files with 13 additions and 5 deletions
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4
kernel/trace/trace_probe.c
View File

@ -554,6 +554,10 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
anon_offs = 0;
field = btf_find_struct_member(ctx->btf, type, fieldname,
&anon_offs);
if (IS_ERR(field)) {
trace_probe_log_err(ctx->offset, BAD_BTF_TID);
return PTR_ERR(field);
}
if (!field) {
trace_probe_log_err(ctx->offset, NO_BTF_FIELD);
return -ENOENT;

14
kernel/trace/trace_uprobe.c
View File

@ -970,19 +970,17 @@ static struct uprobe_cpu_buffer *prepare_uprobe_buffer(struct trace_uprobe *tu,
static void __uprobe_trace_func(struct trace_uprobe *tu,
unsigned long func, struct pt_regs *regs,
struct uprobe_cpu_buffer **ucbp,
struct uprobe_cpu_buffer *ucb,
struct trace_event_file *trace_file)
{
struct uprobe_trace_entry_head *entry;
struct trace_event_buffer fbuffer;
struct uprobe_cpu_buffer *ucb;
void *data;
int size, esize;
struct trace_event_call *call = trace_probe_event_call(&tu->tp);
WARN_ON(call != trace_file->event_call);
ucb = prepare_uprobe_buffer(tu, regs, ucbp);
if (WARN_ON_ONCE(ucb->dsize > PAGE_SIZE))
return;
@ -1014,13 +1012,16 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
struct uprobe_cpu_buffer **ucbp)
{
struct event_file_link *link;
struct uprobe_cpu_buffer *ucb;
if (is_ret_probe(tu))
return 0;
ucb = prepare_uprobe_buffer(tu, regs, ucbp);
rcu_read_lock();
trace_probe_for_each_link_rcu(link, &tu->tp)
__uprobe_trace_func(tu, 0, regs, ucbp, link->file);
__uprobe_trace_func(tu, 0, regs, ucb, link->file);
rcu_read_unlock();
return 0;
@ -1031,10 +1032,13 @@ static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
struct uprobe_cpu_buffer **ucbp)
{
struct event_file_link *link;
struct uprobe_cpu_buffer *ucb;
ucb = prepare_uprobe_buffer(tu, regs, ucbp);
rcu_read_lock();
trace_probe_for_each_link_rcu(link, &tu->tp)
__uprobe_trace_func(tu, func, regs, ucbp, link->file);
__uprobe_trace_func(tu, func, regs, ucb, link->file);
rcu_read_unlock();
}