bpf: rename ARG_PTR_TO_STACK

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>

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index f74ae68..94ea8d2 100644 (file)
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -69,14 +69,14 @@ enum bpf_arg_type {
        /* the following constraints used to prototype bpf_memcmp() and other
         * functions that access data on eBPF program stack
         */
-       ARG_PTR_TO_STACK,       /* any pointer to eBPF program stack */
-       ARG_PTR_TO_RAW_STACK,   /* any pointer to eBPF program stack, area does not
-                                * need to be initialized, helper function must fill
-                                * all bytes or clear them in error case.
+       ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
+       ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
+                                * helper function must fill all bytes or clear
+                                * them in error case.
                                 */
 
-       ARG_CONST_STACK_SIZE,   /* number of bytes accessed from stack */
-       ARG_CONST_STACK_SIZE_OR_ZERO, /* number of bytes accessed from stack or 0 */
+       ARG_CONST_SIZE,         /* number of bytes accessed from memory */
+       ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
 
        ARG_PTR_TO_CTX,         /* pointer to context */
        ARG_ANYTHING,           /* any (initialized) argument is ok */

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 045cbe6..3d24e23 100644 (file)
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -176,6 +176,6 @@ const struct bpf_func_proto bpf_get_current_comm_proto = {
        .func           = bpf_get_current_comm,
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_RAW_STACK,
-       .arg2_type      = ARG_CONST_STACK_SIZE,
+       .arg1_type      = ARG_PTR_TO_UNINIT_MEM,
+       .arg2_type      = ARG_CONST_SIZE,
 };

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 3d4f7bf..2efdc91 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1034,8 +1034,8 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
                expected_type = PTR_TO_STACK;
                if (type != PTR_TO_PACKET && type != expected_type)
                        goto err_type;
-       } else if (arg_type == ARG_CONST_STACK_SIZE ||
-                  arg_type == ARG_CONST_STACK_SIZE_OR_ZERO) {
+       } else if (arg_type == ARG_CONST_SIZE ||
+                  arg_type == ARG_CONST_SIZE_OR_ZERO) {
                expected_type = CONST_IMM;
                /* One exception. Allow UNKNOWN_VALUE registers when the
                 * 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;
                if (type != expected_type)
                        goto err_type;
-       } else if (arg_type == ARG_PTR_TO_STACK ||
-                  arg_type == ARG_PTR_TO_RAW_STACK) {
+       } else if (arg_type == ARG_PTR_TO_MEM ||
+                  arg_type == ARG_PTR_TO_UNINIT_MEM) {
                expected_type = PTR_TO_STACK;
                /* One exception here. In case function allows for NULL to be
                 * 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 &&
                         type != PTR_TO_MAP_VALUE_ADJ && type != expected_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 {
                verbose("unsupported arg_type %d\n", arg_type);
                return -EFAULT;
@@ -1108,9 +1108,9 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
                        err = check_stack_boundary(env, regno,
                                                   meta->map_ptr->value_size,
                                                   false, NULL);
-       } else if (arg_type == ARG_CONST_STACK_SIZE ||
-                  arg_type == ARG_CONST_STACK_SIZE_OR_ZERO) {
-               bool zero_size_allowed = (arg_type == ARG_CONST_STACK_SIZE_OR_ZERO);
+       } else if (arg_type == ARG_CONST_SIZE ||
+                  arg_type == ARG_CONST_SIZE_OR_ZERO) {
+               bool zero_size_allowed = (arg_type == ARG_CONST_SIZE_OR_ZERO);
 
                /* bpf_xxx(..., buf, len) call will access 'len' bytes
                 * 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) {
                        /* 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;
                }
 
@@ -1235,15 +1235,15 @@ static int check_raw_mode(const struct bpf_func_proto *fn)
 {
        int count = 0;
 
-       if (fn->arg1_type == ARG_PTR_TO_RAW_STACK)
+       if (fn->arg1_type == ARG_PTR_TO_UNINIT_MEM)
                count++;
-       if (fn->arg2_type == ARG_PTR_TO_RAW_STACK)
+       if (fn->arg2_type == ARG_PTR_TO_UNINIT_MEM)
                count++;
-       if (fn->arg3_type == ARG_PTR_TO_RAW_STACK)
+       if (fn->arg3_type == ARG_PTR_TO_UNINIT_MEM)
                count++;
-       if (fn->arg4_type == ARG_PTR_TO_RAW_STACK)
+       if (fn->arg4_type == ARG_PTR_TO_UNINIT_MEM)
                count++;
-       if (fn->arg5_type == ARG_PTR_TO_RAW_STACK)
+       if (fn->arg5_type == ARG_PTR_TO_UNINIT_MEM)
                count++;
 
        return count > 1 ? -EINVAL : 0;

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index fa77311..f883c43 100644 (file)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -76,8 +76,8 @@ static const struct bpf_func_proto bpf_probe_read_proto = {
        .func           = bpf_probe_read,
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_RAW_STACK,
-       .arg2_type      = ARG_CONST_STACK_SIZE,
+       .arg1_type      = ARG_PTR_TO_UNINIT_MEM,
+       .arg2_type      = ARG_CONST_SIZE,
        .arg3_type      = ARG_ANYTHING,
 };
 
@@ -109,8 +109,8 @@ static const struct bpf_func_proto bpf_probe_write_user_proto = {
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_ANYTHING,
-       .arg2_type      = ARG_PTR_TO_STACK,
-       .arg3_type      = ARG_CONST_STACK_SIZE,
+       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_CONST_SIZE,
 };
 
 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,
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_STACK,
-       .arg2_type      = ARG_CONST_STACK_SIZE,
+       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_CONST_SIZE,
 };
 
 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,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_STACK,
-       .arg5_type      = ARG_CONST_STACK_SIZE,
+       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg5_type      = ARG_CONST_SIZE,
 };
 
 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,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_STACK,
-       .arg5_type      = ARG_CONST_STACK_SIZE,
+       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg5_type      = ARG_CONST_SIZE,
 };
 
 BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map,

diff --git a/net/core/filter.c b/net/core/filter.c
index 1969b3f..f4d16a9 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1416,8 +1416,8 @@ static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_STACK,
-       .arg4_type      = ARG_CONST_STACK_SIZE,
+       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_CONST_SIZE,
        .arg5_type      = ARG_ANYTHING,
 };
 
@@ -1447,8 +1447,8 @@ static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_RAW_STACK,
-       .arg4_type      = ARG_CONST_STACK_SIZE,
+       .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
+       .arg4_type      = ARG_CONST_SIZE,
 };
 
 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,
        .pkt_access     = true,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_STACK,
-       .arg2_type      = ARG_CONST_STACK_SIZE_OR_ZERO,
-       .arg3_type      = ARG_PTR_TO_STACK,
-       .arg4_type      = ARG_CONST_STACK_SIZE_OR_ZERO,
+       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_CONST_SIZE_OR_ZERO,
+       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_CONST_SIZE_OR_ZERO,
        .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,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_STACK,
-       .arg5_type      = ARG_CONST_STACK_SIZE,
+       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg5_type      = ARG_CONST_SIZE,
 };
 
 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,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_RAW_STACK,
-       .arg3_type      = ARG_CONST_STACK_SIZE,
+       .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
+       .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
 };
 
@@ -2412,8 +2412,8 @@ static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_RAW_STACK,
-       .arg3_type      = ARG_CONST_STACK_SIZE,
+       .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
+       .arg3_type      = ARG_CONST_SIZE,
 };
 
 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,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_STACK,
-       .arg3_type      = ARG_CONST_STACK_SIZE,
+       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
 };
 
@@ -2509,8 +2509,8 @@ static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_STACK,
-       .arg3_type      = ARG_CONST_STACK_SIZE,
+       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_CONST_SIZE,
 };
 
 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,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_STACK,
-       .arg5_type      = ARG_CONST_STACK_SIZE,
+       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg5_type      = ARG_CONST_SIZE,
 };
 
 static const struct bpf_func_proto *