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bpf: rename ARG_PTR_TO_STACK

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since ARG_PTR_TO_STACK is no longer just pointer to stack
rename it to ARG_PTR_TO_MEM and adjust comment.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2017-01-09 10:19:50 -08:00 • committed by David S. Miller
parent 06c1c04972
commit 39f19ebbf5
5 changed files with 52 additions and 52 deletions
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12
include/linux/bpf.h
View file

@ -69,14 +69,14 @@ enum bpf_arg_type {
/* the following constraints used to prototype bpf_memcmp() and other /* the following constraints used to prototype bpf_memcmp() and other
* functions that access data on eBPF program stack * functions that access data on eBPF program stack
*/ */
ARG_PTR_TO_STACK, /* any pointer to eBPF program stack */ ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
ARG_PTR_TO_RAW_STACK, /* any pointer to eBPF program stack, area does not ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
* need to be initialized, helper function must fill * helper function must fill all bytes or clear
* all bytes or clear them in error case. * them in error case.
*/ */
ARG_CONST_STACK_SIZE, /* number of bytes accessed from stack */ ARG_CONST_SIZE, /* number of bytes accessed from memory */
ARG_CONST_STACK_SIZE_OR_ZERO, /* number of bytes accessed from stack or 0 */ ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
ARG_PTR_TO_CTX, /* pointer to context */ ARG_PTR_TO_CTX, /* pointer to context */
ARG_ANYTHING, /* any (initialized) argument is ok */ ARG_ANYTHING, /* any (initialized) argument is ok */

4
kernel/bpf/helpers.c
View file

@ -176,6 +176,6 @@ const struct bpf_func_proto bpf_get_current_comm_proto = {
.func = bpf_get_current_comm, .func = bpf_get_current_comm,
.gpl_only = false, .gpl_only = false,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_RAW_STACK, .arg1_type = ARG_PTR_TO_UNINIT_MEM,
.arg2_type = ARG_CONST_STACK_SIZE, .arg2_type = ARG_CONST_SIZE,
}; };

28
kernel/bpf/verifier.c
View file

@ -1034,8 +1034,8 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
expected_type = PTR_TO_STACK; expected_type = PTR_TO_STACK;
if (type != PTR_TO_PACKET && type != expected_type) if (type != PTR_TO_PACKET && type != expected_type)
goto err_type; goto err_type;
} else if (arg_type == ARG_CONST_STACK_SIZE || } else if (arg_type == ARG_CONST_SIZE ||
arg_type == ARG_CONST_STACK_SIZE_OR_ZERO) { arg_type == ARG_CONST_SIZE_OR_ZERO) {
expected_type = CONST_IMM; expected_type = CONST_IMM;
/* One exception. Allow UNKNOWN_VALUE registers when the /* One exception. Allow UNKNOWN_VALUE registers when the
* boundaries are known and don't cause unsafe memory accesses * boundaries are known and don't cause unsafe memory accesses
@ -1050,8 +1050,8 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
expected_type = PTR_TO_CTX; expected_type = PTR_TO_CTX;
if (type != expected_type) if (type != expected_type)
goto err_type; goto err_type;
} else if (arg_type == ARG_PTR_TO_STACK || } else if (arg_type == ARG_PTR_TO_MEM ||
arg_type == ARG_PTR_TO_RAW_STACK) { arg_type == ARG_PTR_TO_UNINIT_MEM) {
expected_type = PTR_TO_STACK; expected_type = PTR_TO_STACK;
/* One exception here. In case function allows for NULL to be /* One exception here. In case function allows for NULL to be
* passed in as argument, it's a CONST_IMM type. Final test * passed in as argument, it's a CONST_IMM type. Final test
@ -1062,7 +1062,7 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
else if (type != PTR_TO_PACKET && type != PTR_TO_MAP_VALUE && else if (type != PTR_TO_PACKET && type != PTR_TO_MAP_VALUE &&
type != PTR_TO_MAP_VALUE_ADJ && type != expected_type) type != PTR_TO_MAP_VALUE_ADJ && type != expected_type)
goto err_type; goto err_type;
meta->raw_mode = arg_type == ARG_PTR_TO_RAW_STACK; meta->raw_mode = arg_type == ARG_PTR_TO_UNINIT_MEM;
} else { } else {
verbose("unsupported arg_type %d\n", arg_type); verbose("unsupported arg_type %d\n", arg_type);
return -EFAULT; return -EFAULT;
@ -1108,9 +1108,9 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
err = check_stack_boundary(env, regno, err = check_stack_boundary(env, regno,
meta->map_ptr->value_size, meta->map_ptr->value_size,
false, NULL); false, NULL);
} else if (arg_type == ARG_CONST_STACK_SIZE || } else if (arg_type == ARG_CONST_SIZE ||
arg_type == ARG_CONST_STACK_SIZE_OR_ZERO) { arg_type == ARG_CONST_SIZE_OR_ZERO) {
bool zero_size_allowed = (arg_type == ARG_CONST_STACK_SIZE_OR_ZERO); bool zero_size_allowed = (arg_type == ARG_CONST_SIZE_OR_ZERO);
/* bpf_xxx(..., buf, len) call will access 'len' bytes /* bpf_xxx(..., buf, len) call will access 'len' bytes
* from stack pointer 'buf'. Check it * from stack pointer 'buf'. Check it
@ -1118,7 +1118,7 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
*/ */
if (regno == 0) { if (regno == 0) {
/* kernel subsystem misconfigured verifier */ /* kernel subsystem misconfigured verifier */
verbose("ARG_CONST_STACK_SIZE cannot be first argument\n"); verbose("ARG_CONST_SIZE cannot be first argument\n");
return -EACCES; return -EACCES;
} }
@ -1235,15 +1235,15 @@ static int check_raw_mode(const struct bpf_func_proto *fn)
{ {
int count = 0; int count = 0;
if (fn->arg1_type == ARG_PTR_TO_RAW_STACK) if (fn->arg1_type == ARG_PTR_TO_UNINIT_MEM)
count++; count++;
if (fn->arg2_type == ARG_PTR_TO_RAW_STACK) if (fn->arg2_type == ARG_PTR_TO_UNINIT_MEM)
count++; count++;
if (fn->arg3_type == ARG_PTR_TO_RAW_STACK) if (fn->arg3_type == ARG_PTR_TO_UNINIT_MEM)
count++; count++;
if (fn->arg4_type == ARG_PTR_TO_RAW_STACK) if (fn->arg4_type == ARG_PTR_TO_UNINIT_MEM)
count++; count++;
if (fn->arg5_type == ARG_PTR_TO_RAW_STACK) if (fn->arg5_type == ARG_PTR_TO_UNINIT_MEM)
count++; count++;
return count > 1 ? -EINVAL : 0; return count > 1 ? -EINVAL : 0;

20
kernel/trace/bpf_trace.c
View file

@ -76,8 +76,8 @@ static const struct bpf_func_proto bpf_probe_read_proto = {
.func = bpf_probe_read, .func = bpf_probe_read,
.gpl_only = true, .gpl_only = true,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_RAW_STACK, .arg1_type = ARG_PTR_TO_UNINIT_MEM,
.arg2_type = ARG_CONST_STACK_SIZE, .arg2_type = ARG_CONST_SIZE,
.arg3_type = ARG_ANYTHING, .arg3_type = ARG_ANYTHING,
}; };
@ -109,8 +109,8 @@ static const struct bpf_func_proto bpf_probe_write_user_proto = {
.gpl_only = true, .gpl_only = true,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_ANYTHING, .arg1_type = ARG_ANYTHING,
.arg2_type = ARG_PTR_TO_STACK, .arg2_type = ARG_PTR_TO_MEM,
.arg3_type = ARG_CONST_STACK_SIZE, .arg3_type = ARG_CONST_SIZE,
}; };
static const struct bpf_func_proto *bpf_get_probe_write_proto(void) static const struct bpf_func_proto *bpf_get_probe_write_proto(void)
@ -213,8 +213,8 @@ static const struct bpf_func_proto bpf_trace_printk_proto = {
.func = bpf_trace_printk, .func = bpf_trace_printk,
.gpl_only = true, .gpl_only = true,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_STACK, .arg1_type = ARG_PTR_TO_MEM,
.arg2_type = ARG_CONST_STACK_SIZE, .arg2_type = ARG_CONST_SIZE,
}; };
const struct bpf_func_proto *bpf_get_trace_printk_proto(void) const struct bpf_func_proto *bpf_get_trace_printk_proto(void)
@ -329,8 +329,8 @@ static const struct bpf_func_proto bpf_perf_event_output_proto = {
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_CONST_MAP_PTR, .arg2_type = ARG_CONST_MAP_PTR,
.arg3_type = ARG_ANYTHING, .arg3_type = ARG_ANYTHING,
.arg4_type = ARG_PTR_TO_STACK, .arg4_type = ARG_PTR_TO_MEM,
.arg5_type = ARG_CONST_STACK_SIZE, .arg5_type = ARG_CONST_SIZE,
}; };
static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs); static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs);
@ -492,8 +492,8 @@ static const struct bpf_func_proto bpf_perf_event_output_proto_tp = {
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_CONST_MAP_PTR, .arg2_type = ARG_CONST_MAP_PTR,
.arg3_type = ARG_ANYTHING, .arg3_type = ARG_ANYTHING,
.arg4_type = ARG_PTR_TO_STACK, .arg4_type = ARG_PTR_TO_MEM,
.arg5_type = ARG_CONST_STACK_SIZE, .arg5_type = ARG_CONST_SIZE,
}; };
BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map, BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map,

40
net/core/filter.c
View file

@ -1416,8 +1416,8 @@ static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_ANYTHING, .arg2_type = ARG_ANYTHING,
.arg3_type = ARG_PTR_TO_STACK, .arg3_type = ARG_PTR_TO_MEM,
.arg4_type = ARG_CONST_STACK_SIZE, .arg4_type = ARG_CONST_SIZE,
.arg5_type = ARG_ANYTHING, .arg5_type = ARG_ANYTHING,
}; };
@ -1447,8 +1447,8 @@ static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_ANYTHING, .arg2_type = ARG_ANYTHING,
.arg3_type = ARG_PTR_TO_RAW_STACK, .arg3_type = ARG_PTR_TO_UNINIT_MEM,
.arg4_type = ARG_CONST_STACK_SIZE, .arg4_type = ARG_CONST_SIZE,
}; };
BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
@ -1601,10 +1601,10 @@ static const struct bpf_func_proto bpf_csum_diff_proto = {
.gpl_only = false, .gpl_only = false,
.pkt_access = true, .pkt_access = true,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_STACK, .arg1_type = ARG_PTR_TO_MEM,
.arg2_type = ARG_CONST_STACK_SIZE_OR_ZERO, .arg2_type = ARG_CONST_SIZE_OR_ZERO,
.arg3_type = ARG_PTR_TO_STACK, .arg3_type = ARG_PTR_TO_MEM,
.arg4_type = ARG_CONST_STACK_SIZE_OR_ZERO, .arg4_type = ARG_CONST_SIZE_OR_ZERO,
.arg5_type = ARG_ANYTHING, .arg5_type = ARG_ANYTHING,
}; };
@ -2306,8 +2306,8 @@ static const struct bpf_func_proto bpf_skb_event_output_proto = {
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_CONST_MAP_PTR, .arg2_type = ARG_CONST_MAP_PTR,
.arg3_type = ARG_ANYTHING, .arg3_type = ARG_ANYTHING,
.arg4_type = ARG_PTR_TO_STACK, .arg4_type = ARG_PTR_TO_MEM,
.arg5_type = ARG_CONST_STACK_SIZE, .arg5_type = ARG_CONST_SIZE,
}; };
static unsigned short bpf_tunnel_key_af(u64 flags) static unsigned short bpf_tunnel_key_af(u64 flags)
@ -2377,8 +2377,8 @@ static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
.gpl_only = false, .gpl_only = false,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_PTR_TO_RAW_STACK, .arg2_type = ARG_PTR_TO_UNINIT_MEM,
.arg3_type = ARG_CONST_STACK_SIZE, .arg3_type = ARG_CONST_SIZE,
.arg4_type = ARG_ANYTHING, .arg4_type = ARG_ANYTHING,
}; };
@ -2412,8 +2412,8 @@ static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
.gpl_only = false, .gpl_only = false,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_PTR_TO_RAW_STACK, .arg2_type = ARG_PTR_TO_UNINIT_MEM,
.arg3_type = ARG_CONST_STACK_SIZE, .arg3_type = ARG_CONST_SIZE,
}; };
static struct metadata_dst __percpu *md_dst; static struct metadata_dst __percpu *md_dst;
@ -2483,8 +2483,8 @@ static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
.gpl_only = false, .gpl_only = false,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_PTR_TO_STACK, .arg2_type = ARG_PTR_TO_MEM,
.arg3_type = ARG_CONST_STACK_SIZE, .arg3_type = ARG_CONST_SIZE,
.arg4_type = ARG_ANYTHING, .arg4_type = ARG_ANYTHING,
}; };
@ -2509,8 +2509,8 @@ static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
.gpl_only = false, .gpl_only = false,
.ret_type = RET_INTEGER, .ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_PTR_TO_STACK, .arg2_type = ARG_PTR_TO_MEM,
.arg3_type = ARG_CONST_STACK_SIZE, .arg3_type = ARG_CONST_SIZE,
}; };
static const struct bpf_func_proto * static const struct bpf_func_proto *
@ -2593,8 +2593,8 @@ static const struct bpf_func_proto bpf_xdp_event_output_proto = {
.arg1_type = ARG_PTR_TO_CTX, .arg1_type = ARG_PTR_TO_CTX,
.arg2_type = ARG_CONST_MAP_PTR, .arg2_type = ARG_CONST_MAP_PTR,
.arg3_type = ARG_ANYTHING, .arg3_type = ARG_ANYTHING,
.arg4_type = ARG_PTR_TO_STACK, .arg4_type = ARG_PTR_TO_MEM,
.arg5_type = ARG_CONST_STACK_SIZE, .arg5_type = ARG_CONST_SIZE,
}; };
static const struct bpf_func_proto * static const struct bpf_func_proto *