Commit 639a53da authored by Daniel Borkmann's avatar Daniel Borkmann

Merge branch 'bpf-print-insns-api'

Jiri Olsa says:

====================
This patchset removes struct bpf_verifier_env argument
from print_bpf_insn function (patch 1) and changes user
space bpftool user to use it that way (patch 2).
====================
Reviewed-by: default avatarQuentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parents ae06c70b 337682ca
......@@ -113,16 +113,16 @@ static const char *const bpf_jmp_string[16] = {
};
static void print_bpf_end_insn(bpf_insn_print_t verbose,
struct bpf_verifier_env *env,
void *private_data,
const struct bpf_insn *insn)
{
verbose(env, "(%02x) r%d = %s%d r%d\n", insn->code, insn->dst_reg,
verbose(private_data, "(%02x) r%d = %s%d r%d\n",
insn->code, insn->dst_reg,
BPF_SRC(insn->code) == BPF_TO_BE ? "be" : "le",
insn->imm, insn->dst_reg);
}
void print_bpf_insn(const struct bpf_insn_cbs *cbs,
struct bpf_verifier_env *env,
const struct bpf_insn *insn,
bool allow_ptr_leaks)
{
......@@ -132,23 +132,23 @@ void print_bpf_insn(const struct bpf_insn_cbs *cbs,
if (class == BPF_ALU || class == BPF_ALU64) {
if (BPF_OP(insn->code) == BPF_END) {
if (class == BPF_ALU64)
verbose(env, "BUG_alu64_%02x\n", insn->code);
verbose(cbs->private_data, "BUG_alu64_%02x\n", insn->code);
else
print_bpf_end_insn(verbose, env, insn);
print_bpf_end_insn(verbose, cbs->private_data, insn);
} else if (BPF_OP(insn->code) == BPF_NEG) {
verbose(env, "(%02x) r%d = %s-r%d\n",
verbose(cbs->private_data, "(%02x) r%d = %s-r%d\n",
insn->code, insn->dst_reg,
class == BPF_ALU ? "(u32) " : "",
insn->dst_reg);
} else if (BPF_SRC(insn->code) == BPF_X) {
verbose(env, "(%02x) %sr%d %s %sr%d\n",
verbose(cbs->private_data, "(%02x) %sr%d %s %sr%d\n",
insn->code, class == BPF_ALU ? "(u32) " : "",
insn->dst_reg,
bpf_alu_string[BPF_OP(insn->code) >> 4],
class == BPF_ALU ? "(u32) " : "",
insn->src_reg);
} else {
verbose(env, "(%02x) %sr%d %s %s%d\n",
verbose(cbs->private_data, "(%02x) %sr%d %s %s%d\n",
insn->code, class == BPF_ALU ? "(u32) " : "",
insn->dst_reg,
bpf_alu_string[BPF_OP(insn->code) >> 4],
......@@ -157,46 +157,46 @@ void print_bpf_insn(const struct bpf_insn_cbs *cbs,
}
} else if (class == BPF_STX) {
if (BPF_MODE(insn->code) == BPF_MEM)
verbose(env, "(%02x) *(%s *)(r%d %+d) = r%d\n",
verbose(cbs->private_data, "(%02x) *(%s *)(r%d %+d) = r%d\n",
insn->code,
bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
insn->dst_reg,
insn->off, insn->src_reg);
else if (BPF_MODE(insn->code) == BPF_XADD)
verbose(env, "(%02x) lock *(%s *)(r%d %+d) += r%d\n",
verbose(cbs->private_data, "(%02x) lock *(%s *)(r%d %+d) += r%d\n",
insn->code,
bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
insn->dst_reg, insn->off,
insn->src_reg);
else
verbose(env, "BUG_%02x\n", insn->code);
verbose(cbs->private_data, "BUG_%02x\n", insn->code);
} else if (class == BPF_ST) {
if (BPF_MODE(insn->code) != BPF_MEM) {
verbose(env, "BUG_st_%02x\n", insn->code);
verbose(cbs->private_data, "BUG_st_%02x\n", insn->code);
return;
}
verbose(env, "(%02x) *(%s *)(r%d %+d) = %d\n",
verbose(cbs->private_data, "(%02x) *(%s *)(r%d %+d) = %d\n",
insn->code,
bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
insn->dst_reg,
insn->off, insn->imm);
} else if (class == BPF_LDX) {
if (BPF_MODE(insn->code) != BPF_MEM) {
verbose(env, "BUG_ldx_%02x\n", insn->code);
verbose(cbs->private_data, "BUG_ldx_%02x\n", insn->code);
return;
}
verbose(env, "(%02x) r%d = *(%s *)(r%d %+d)\n",
verbose(cbs->private_data, "(%02x) r%d = *(%s *)(r%d %+d)\n",
insn->code, insn->dst_reg,
bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
insn->src_reg, insn->off);
} else if (class == BPF_LD) {
if (BPF_MODE(insn->code) == BPF_ABS) {
verbose(env, "(%02x) r0 = *(%s *)skb[%d]\n",
verbose(cbs->private_data, "(%02x) r0 = *(%s *)skb[%d]\n",
insn->code,
bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
insn->imm);
} else if (BPF_MODE(insn->code) == BPF_IND) {
verbose(env, "(%02x) r0 = *(%s *)skb[r%d + %d]\n",
verbose(cbs->private_data, "(%02x) r0 = *(%s *)skb[r%d + %d]\n",
insn->code,
bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
insn->src_reg, insn->imm);
......@@ -212,12 +212,12 @@ void print_bpf_insn(const struct bpf_insn_cbs *cbs,
if (map_ptr && !allow_ptr_leaks)
imm = 0;
verbose(env, "(%02x) r%d = %s\n",
verbose(cbs->private_data, "(%02x) r%d = %s\n",
insn->code, insn->dst_reg,
__func_imm_name(cbs, insn, imm,
tmp, sizeof(tmp)));
} else {
verbose(env, "BUG_ld_%02x\n", insn->code);
verbose(cbs->private_data, "BUG_ld_%02x\n", insn->code);
return;
}
} else if (class == BPF_JMP) {
......@@ -227,35 +227,35 @@ void print_bpf_insn(const struct bpf_insn_cbs *cbs,
char tmp[64];
if (insn->src_reg == BPF_PSEUDO_CALL) {
verbose(env, "(%02x) call pc%s\n",
verbose(cbs->private_data, "(%02x) call pc%s\n",
insn->code,
__func_get_name(cbs, insn,
tmp, sizeof(tmp)));
} else {
strcpy(tmp, "unknown");
verbose(env, "(%02x) call %s#%d\n", insn->code,
verbose(cbs->private_data, "(%02x) call %s#%d\n", insn->code,
__func_get_name(cbs, insn,
tmp, sizeof(tmp)),
insn->imm);
}
} else if (insn->code == (BPF_JMP | BPF_JA)) {
verbose(env, "(%02x) goto pc%+d\n",
verbose(cbs->private_data, "(%02x) goto pc%+d\n",
insn->code, insn->off);
} else if (insn->code == (BPF_JMP | BPF_EXIT)) {
verbose(env, "(%02x) exit\n", insn->code);
verbose(cbs->private_data, "(%02x) exit\n", insn->code);
} else if (BPF_SRC(insn->code) == BPF_X) {
verbose(env, "(%02x) if r%d %s r%d goto pc%+d\n",
verbose(cbs->private_data, "(%02x) if r%d %s r%d goto pc%+d\n",
insn->code, insn->dst_reg,
bpf_jmp_string[BPF_OP(insn->code) >> 4],
insn->src_reg, insn->off);
} else {
verbose(env, "(%02x) if r%d %s 0x%x goto pc%+d\n",
verbose(cbs->private_data, "(%02x) if r%d %s 0x%x goto pc%+d\n",
insn->code, insn->dst_reg,
bpf_jmp_string[BPF_OP(insn->code) >> 4],
insn->imm, insn->off);
}
} else {
verbose(env, "(%02x) %s\n",
verbose(cbs->private_data, "(%02x) %s\n",
insn->code, bpf_class_string[class]);
}
}
......@@ -22,14 +22,12 @@
#include <string.h>
#endif
struct bpf_verifier_env;
extern const char *const bpf_alu_string[16];
extern const char *const bpf_class_string[8];
const char *func_id_name(int id);
typedef __printf(2, 3) void (*bpf_insn_print_t)(struct bpf_verifier_env *env,
typedef __printf(2, 3) void (*bpf_insn_print_t)(void *private_data,
const char *, ...);
typedef const char *(*bpf_insn_revmap_call_t)(void *private_data,
const struct bpf_insn *insn);
......@@ -45,7 +43,6 @@ struct bpf_insn_cbs {
};
void print_bpf_insn(const struct bpf_insn_cbs *cbs,
struct bpf_verifier_env *env,
const struct bpf_insn *insn,
bool allow_ptr_leaks);
#endif
......@@ -168,23 +168,16 @@ struct bpf_call_arg_meta {
static DEFINE_MUTEX(bpf_verifier_lock);
/* log_level controls verbosity level of eBPF verifier.
* bpf_verifier_log_write() is used to dump the verification trace to the log,
* so the user can figure out what's wrong with the program
*/
__printf(2, 3) void bpf_verifier_log_write(struct bpf_verifier_env *env,
const char *fmt, ...)
static void log_write(struct bpf_verifier_env *env, const char *fmt,
va_list args)
{
struct bpf_verifer_log *log = &env->log;
unsigned int n;
va_list args;
if (!log->level || !log->ubuf || bpf_verifier_log_full(log))
return;
va_start(args, fmt);
n = vscnprintf(log->kbuf, BPF_VERIFIER_TMP_LOG_SIZE, fmt, args);
va_end(args);
WARN_ONCE(n >= BPF_VERIFIER_TMP_LOG_SIZE - 1,
"verifier log line truncated - local buffer too short\n");
......@@ -197,14 +190,30 @@ __printf(2, 3) void bpf_verifier_log_write(struct bpf_verifier_env *env,
else
log->ubuf = NULL;
}
EXPORT_SYMBOL_GPL(bpf_verifier_log_write);
/* Historically bpf_verifier_log_write was called verbose, but the name was too
* generic for symbol export. The function was renamed, but not the calls in
* the verifier to avoid complicating backports. Hence the alias below.
/* log_level controls verbosity level of eBPF verifier.
* bpf_verifier_log_write() is used to dump the verification trace to the log,
* so the user can figure out what's wrong with the program
*/
static __printf(2, 3) void verbose(struct bpf_verifier_env *env,
const char *fmt, ...)
__attribute__((alias("bpf_verifier_log_write")));
__printf(2, 3) void bpf_verifier_log_write(struct bpf_verifier_env *env,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
log_write(env, fmt, args);
va_end(args);
}
EXPORT_SYMBOL_GPL(bpf_verifier_log_write);
__printf(2, 3) static void verbose(void *private_data, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
log_write(private_data, fmt, args);
va_end(args);
}
static bool type_is_pkt_pointer(enum bpf_reg_type type)
{
......@@ -4600,10 +4609,11 @@ static int do_check(struct bpf_verifier_env *env)
if (env->log.level) {
const struct bpf_insn_cbs cbs = {
.cb_print = verbose,
.private_data = env,
};
verbose(env, "%d: ", insn_idx);
print_bpf_insn(&cbs, env, insn, env->allow_ptr_leaks);
print_bpf_insn(&cbs, insn, env->allow_ptr_leaks);
}
if (bpf_prog_is_dev_bound(env->prog->aux)) {
......
......@@ -114,7 +114,7 @@ static struct kernel_sym *kernel_syms_search(struct dump_data *dd,
sizeof(*dd->sym_mapping), kernel_syms_cmp) : NULL;
}
static void print_insn(struct bpf_verifier_env *env, const char *fmt, ...)
static void print_insn(void *private_data, const char *fmt, ...)
{
va_list args;
......@@ -124,7 +124,7 @@ static void print_insn(struct bpf_verifier_env *env, const char *fmt, ...)
}
static void
print_insn_for_graph(struct bpf_verifier_env *env, const char *fmt, ...)
print_insn_for_graph(void *private_data, const char *fmt, ...)
{
char buf[64], *p;
va_list args;
......@@ -154,7 +154,7 @@ print_insn_for_graph(struct bpf_verifier_env *env, const char *fmt, ...)
printf("%s", buf);
}
static void print_insn_json(struct bpf_verifier_env *env, const char *fmt, ...)
static void print_insn_json(void *private_data, const char *fmt, ...)
{
unsigned int l = strlen(fmt);
char chomped_fmt[l];
......@@ -248,7 +248,7 @@ void dump_xlated_json(struct dump_data *dd, void *buf, unsigned int len,
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "disasm");
print_bpf_insn(&cbs, NULL, insn + i, true);
print_bpf_insn(&cbs, insn + i, true);
if (opcodes) {
jsonw_name(json_wtr, "opcodes");
......@@ -302,7 +302,7 @@ void dump_xlated_plain(struct dump_data *dd, void *buf, unsigned int len,
double_insn = insn[i].code == (BPF_LD | BPF_IMM | BPF_DW);
printf("% 4d: ", i);
print_bpf_insn(&cbs, NULL, insn + i, true);
print_bpf_insn(&cbs, insn + i, true);
if (opcodes) {
printf(" ");
......@@ -331,7 +331,7 @@ void dump_xlated_for_graph(struct dump_data *dd, void *buf_start, void *buf_end,
for (; cur <= insn_end; cur++) {
printf("% 4d: ", (int)(cur - insn_start + start_idx));
print_bpf_insn(&cbs, NULL, cur, true);
print_bpf_insn(&cbs, cur, true);
if (cur != insn_end)
printf(" | ");
}
......
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