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bpf: Remove trace_printk_lock 

commit e2bb9e01d5 upstream.

Both bpf_trace_printk and bpf_trace_vprintk helpers use static buffer guarded
with trace_printk_lock spin lock.

The spin lock contention causes issues with bpf programs attached to
contention_begin tracepoint [1][2].

Andrii suggested we could get rid of the contention by using trylock, but we
could actually get rid of the spinlock completely by using percpu buffers the
same way as for bin_args in bpf_bprintf_prepare function.

Adding new return 'buf' argument to struct bpf_bprintf_data and making
bpf_bprintf_prepare to return also the buffer for printk helpers.

  [1] https://lore.kernel.org/bpf/CACkBjsakT_yWxnSWr4r-0TpPvbKm9-OBmVUhJb7hV3hY8fdCkw@mail.gmail.com/
  [2] https://lore.kernel.org/bpf/CACkBjsaCsTovQHFfkqJKto6S4Z8d02ud1D7MPESrHa1cVNNTrw@mail.gmail.com/

Reported-by: Hao Sun <sunhao.th@gmail.com>
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20221215214430.1336195-4-jolsa@kernel.org
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Olsa 2022-12-15 22:44:30 +01:00 committed by Greg Kroah-Hartman
parent 95b7476f6f
commit f3e9758286
3 changed files with 28 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/bpf.h
View File

@ -2739,10 +2739,13 @@ struct btf_id_set;
bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
#define MAX_BPRINTF_VARARGS 12
#define MAX_BPRINTF_BUF 1024
struct bpf_bprintf_data {
u32 *bin_args;
char *buf;
bool get_bin_args;
bool get_buf;
};
int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,

31
kernel/bpf/helpers.c
View File

@ -753,19 +753,20 @@ static int bpf_trace_copy_string(char *buf, void *unsafe_ptr, char fmt_ptype,
/* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary
* arguments representation.
*/
#define MAX_BPRINTF_BUF_LEN 512
#define MAX_BPRINTF_BIN_ARGS 512
/* Support executing three nested bprintf helper calls on a given CPU */
#define MAX_BPRINTF_NEST_LEVEL 3
struct bpf_bprintf_buffers {
char tmp_bufs[MAX_BPRINTF_NEST_LEVEL][MAX_BPRINTF_BUF_LEN];
char bin_args[MAX_BPRINTF_BIN_ARGS];
char buf[MAX_BPRINTF_BUF];
};
static DEFINE_PER_CPU(struct bpf_bprintf_buffers, bpf_bprintf_bufs);
static DEFINE_PER_CPU(struct bpf_bprintf_buffers[MAX_BPRINTF_NEST_LEVEL], bpf_bprintf_bufs);
static DEFINE_PER_CPU(int, bpf_bprintf_nest_level);
static int try_get_fmt_tmp_buf(char **tmp_buf)
static int try_get_buffers(struct bpf_bprintf_buffers **bufs)
{
struct bpf_bprintf_buffers *bufs;
int nest_level;
preempt_disable();
@ -775,15 +776,14 @@ static int try_get_fmt_tmp_buf(char **tmp_buf)
preempt_enable();
return -EBUSY;
}
bufs = this_cpu_ptr(&bpf_bprintf_bufs);
*tmp_buf = bufs->tmp_bufs[nest_level - 1];
*bufs = this_cpu_ptr(&bpf_bprintf_bufs[nest_level - 1]);
return 0;
}
void bpf_bprintf_cleanup(struct bpf_bprintf_data *data)
{
if (!data->bin_args)
if (!data->bin_args && !data->buf)
return;
if (WARN_ON_ONCE(this_cpu_read(bpf_bprintf_nest_level) == 0))
return;
@ -808,7 +808,9 @@ void bpf_bprintf_cleanup(struct bpf_bprintf_data *data)
int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
u32 num_args, struct bpf_bprintf_data *data)
{
bool get_buffers = (data->get_bin_args && num_args) || data->get_buf;
char *unsafe_ptr = NULL, *tmp_buf = NULL, *tmp_buf_end, *fmt_end;
struct bpf_bprintf_buffers *buffers = NULL;
size_t sizeof_cur_arg, sizeof_cur_ip;
int err, i, num_spec = 0;
u64 cur_arg;
@ -819,14 +821,19 @@ int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
return -EINVAL;
fmt_size = fmt_end - fmt;
if (data->get_bin_args) {
if (num_args && try_get_fmt_tmp_buf(&tmp_buf))
return -EBUSY;
if (get_buffers && try_get_buffers(&buffers))
return -EBUSY;
tmp_buf_end = tmp_buf + MAX_BPRINTF_BUF_LEN;
if (data->get_bin_args) {
if (num_args)
tmp_buf = buffers->bin_args;
tmp_buf_end = tmp_buf + MAX_BPRINTF_BIN_ARGS;
data->bin_args = (u32 *)tmp_buf;
}
if (data->get_buf)
data->buf = buffers->buf;
for (i = 0; i < fmt_size; i++) {
if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) {
err = -EINVAL;

20
kernel/trace/bpf_trace.c
View File

@ -368,8 +368,6 @@ static const struct bpf_func_proto *bpf_get_probe_write_proto(void)
return &bpf_probe_write_user_proto;
}
static DEFINE_RAW_SPINLOCK(trace_printk_lock);
#define MAX_TRACE_PRINTK_VARARGS 3
#define BPF_TRACE_PRINTK_SIZE 1024
@ -379,9 +377,8 @@ BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1,
u64 args[MAX_TRACE_PRINTK_VARARGS] = { arg1, arg2, arg3 };
struct bpf_bprintf_data data = {
.get_bin_args = true,
.get_buf = true,
};
static char buf[BPF_TRACE_PRINTK_SIZE];
unsigned long flags;
int ret;
ret = bpf_bprintf_prepare(fmt, fmt_size, args,
@ -389,11 +386,9 @@ BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1,
if (ret < 0)
return ret;
raw_spin_lock_irqsave(&trace_printk_lock, flags);
ret = bstr_printf(buf, sizeof(buf), fmt, data.bin_args);
ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args);
trace_bpf_trace_printk(buf);
raw_spin_unlock_irqrestore(&trace_printk_lock, flags);
trace_bpf_trace_printk(data.buf);
bpf_bprintf_cleanup(&data);
@ -433,9 +428,8 @@ BPF_CALL_4(bpf_trace_vprintk, char *, fmt, u32, fmt_size, const void *, args,
{
struct bpf_bprintf_data data = {
.get_bin_args = true,
.get_buf = true,
};
static char buf[BPF_TRACE_PRINTK_SIZE];
unsigned long flags;
int ret, num_args;
if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 ||
@ -447,11 +441,9 @@ BPF_CALL_4(bpf_trace_vprintk, char *, fmt, u32, fmt_size, const void *, args,
if (ret < 0)
return ret;
raw_spin_lock_irqsave(&trace_printk_lock, flags);
ret = bstr_printf(buf, sizeof(buf), fmt, data.bin_args);
ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args);
trace_bpf_trace_printk(buf);
raw_spin_unlock_irqrestore(&trace_printk_lock, flags);
trace_bpf_trace_printk(data.buf);
bpf_bprintf_cleanup(&data);