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bpf: Prevent bpf program recursion for raw tracepoint probes

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We got report from sysbot [1] about warnings that were caused by
bpf program attached to contention_begin raw tracepoint triggering
the same tracepoint by using bpf_trace_printk helper that takes
trace_printk_lock lock.

 Call Trace:
  <TASK>
  ? trace_event_raw_event_bpf_trace_printk+0x5f/0x90
  bpf_trace_printk+0x2b/0xe0
  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
  bpf_trace_run2+0x26/0x90
  native_queued_spin_lock_slowpath+0x1c6/0x2b0
  _raw_spin_lock_irqsave+0x44/0x50
  bpf_trace_printk+0x3f/0xe0
  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
  bpf_trace_run2+0x26/0x90
  native_queued_spin_lock_slowpath+0x1c6/0x2b0
  _raw_spin_lock_irqsave+0x44/0x50
  bpf_trace_printk+0x3f/0xe0
  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
  bpf_trace_run2+0x26/0x90
  native_queued_spin_lock_slowpath+0x1c6/0x2b0
  _raw_spin_lock_irqsave+0x44/0x50
  bpf_trace_printk+0x3f/0xe0
  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
  bpf_trace_run2+0x26/0x90
  native_queued_spin_lock_slowpath+0x1c6/0x2b0
  _raw_spin_lock_irqsave+0x44/0x50
  __unfreeze_partials+0x5b/0x160
  ...

The can be reproduced by attaching bpf program as raw tracepoint on
contention_begin tracepoint. The bpf prog calls bpf_trace_printk
helper. Then by running perf bench the spin lock code is forced to
take slow path and call contention_begin tracepoint.

Fixing this by skipping execution of the bpf program if it's
already running, Using bpf prog 'active' field, which is being
currently used by trampoline programs for the same reason.

Moving bpf_prog_inc_misses_counter to syscall.c because
trampoline.c is compiled in just for CONFIG_BPF_JIT option.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Reported-by: syzbot+2251879aa068ad9c960d@syzkaller.appspotmail.com
[1] https://lore.kernel.org/bpf/YxhFe3EwqchC%2FfYf@krava/T/#t
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220916071914.7156-1-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2022-09-16 09:19:14 +02:00 committed by Alexei Starovoitov
parent 66d6a4bf94
commit 05b24ff9b2
4 changed files with 25 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/bpf.h
View File

@ -2042,6 +2042,8 @@ static inline bool has_current_bpf_ctx(void)
{
return !!current->bpf_ctx;
}
void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
#else /* !CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
@ -2264,6 +2266,10 @@ static inline bool has_current_bpf_ctx(void)
{
return false;
}
static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
{
}
#endif /* CONFIG_BPF_SYSCALL */
void __bpf_free_used_btfs(struct bpf_prog_aux *aux,

11
kernel/bpf/syscall.c
View File

@ -2093,6 +2093,17 @@ struct bpf_prog_kstats {
u64 misses;
};
void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog)
{
struct bpf_prog_stats *stats;
unsigned int flags;
stats = this_cpu_ptr(prog->stats);
flags = u64_stats_update_begin_irqsave(&stats->syncp);
u64_stats_inc(&stats->misses);
u64_stats_update_end_irqrestore(&stats->syncp, flags);
}
static void bpf_prog_get_stats(const struct bpf_prog *prog,
struct bpf_prog_kstats *stats)
{

15
kernel/bpf/trampoline.c
View File

@ -863,17 +863,6 @@ static __always_inline u64 notrace bpf_prog_start_time(void)
return start;
}
static void notrace inc_misses_counter(struct bpf_prog *prog)
{
struct bpf_prog_stats *stats;
unsigned int flags;
stats = this_cpu_ptr(prog->stats);
flags = u64_stats_update_begin_irqsave(&stats->syncp);
u64_stats_inc(&stats->misses);
u64_stats_update_end_irqrestore(&stats->syncp, flags);
}
/* The logic is similar to bpf_prog_run(), but with an explicit
* rcu_read_lock() and migrate_disable() which are required
* for the trampoline. The macro is split into
@ -896,7 +885,7 @@ u64 notrace __bpf_prog_enter(struct bpf_prog *prog, struct bpf_tramp_run_ctx *ru
run_ctx->saved_run_ctx = bpf_set_run_ctx(&run_ctx->run_ctx);
if (unlikely(this_cpu_inc_return(*(prog->active)) != 1)) {
inc_misses_counter(prog);
bpf_prog_inc_misses_counter(prog);
return 0;
}
return bpf_prog_start_time();
@ -967,7 +956,7 @@ u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog, struct bpf_tramp_r
might_fault();
if (unlikely(this_cpu_inc_return(*(prog->active)) != 1)) {
inc_misses_counter(prog);
bpf_prog_inc_misses_counter(prog);
return 0;
}

6
kernel/trace/bpf_trace.c
View File

@ -2222,9 +2222,15 @@ static __always_inline
void __bpf_trace_run(struct bpf_prog *prog, u64 *args)
{
cant_sleep();
if (unlikely(this_cpu_inc_return(*(prog->active)) != 1)) {
bpf_prog_inc_misses_counter(prog);
goto out;
}
rcu_read_lock();
(void) bpf_prog_run(prog, args);
rcu_read_unlock();
out:
this_cpu_dec(*(prog->active));
}
#define UNPACK(...) __VA_ARGS__