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authorDaniel Borkmann <daniel@iogearbox.net>2016-04-13 00:10:52 +0200
committerDavid S. Miller <davem@davemloft.net>2016-04-14 21:40:41 -0400
commit074f528eed408b467516e142fa4c45e5b0d2ba16 (patch)
treee42352604c4f0db159881faff4b7cef49393d878
parent435faee1aae9c1ac231f89e4faf0437bfe29f425 (diff)
downloadlinux-074f528eed408b467516e142fa4c45e5b0d2ba16.tar.gz
bpf: convert relevant helper args to ARG_PTR_TO_RAW_STACK
This patch converts all helpers that can use ARG_PTR_TO_RAW_STACK as argument type. For tc programs this is bpf_skb_load_bytes(), bpf_skb_get_tunnel_key(), bpf_skb_get_tunnel_opt(). For tracing, this optimizes bpf_get_current_comm() and bpf_probe_read(). The check in bpf_skb_load_bytes() for MAX_BPF_STACK can also be removed since the verifier already makes sure we stay within bounds on stack buffers. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--kernel/bpf/helpers.c17
-rw-r--r--kernel/trace/bpf_trace.c10
-rw-r--r--net/core/filter.c57
3 files changed, 60 insertions, 24 deletions
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 50da680c479f..ad7a0573f71b 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -163,17 +163,26 @@ static u64 bpf_get_current_comm(u64 r1, u64 size, u64 r3, u64 r4, u64 r5)
struct task_struct *task = current;
char *buf = (char *) (long) r1;
- if (!task)
- return -EINVAL;
+ if (unlikely(!task))
+ goto err_clear;
- strlcpy(buf, task->comm, min_t(size_t, size, sizeof(task->comm)));
+ strncpy(buf, task->comm, size);
+
+ /* Verifier guarantees that size > 0. For task->comm exceeding
+ * size, guarantee that buf is %NUL-terminated. Unconditionally
+ * done here to save the size test.
+ */
+ buf[size - 1] = 0;
return 0;
+err_clear:
+ memset(buf, 0, size);
+ return -EINVAL;
}
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_STACK,
+ .arg1_type = ARG_PTR_TO_RAW_STACK,
.arg2_type = ARG_CONST_STACK_SIZE,
};
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 413ec5614180..685587885374 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -62,17 +62,21 @@ EXPORT_SYMBOL_GPL(trace_call_bpf);
static u64 bpf_probe_read(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
{
void *dst = (void *) (long) r1;
- int size = (int) r2;
+ int ret, size = (int) r2;
void *unsafe_ptr = (void *) (long) r3;
- return probe_kernel_read(dst, unsafe_ptr, size);
+ ret = probe_kernel_read(dst, unsafe_ptr, size);
+ if (unlikely(ret < 0))
+ memset(dst, 0, size);
+
+ return ret;
}
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_STACK,
+ .arg1_type = ARG_PTR_TO_RAW_STACK,
.arg2_type = ARG_CONST_STACK_SIZE,
.arg3_type = ARG_ANYTHING,
};
diff --git a/net/core/filter.c b/net/core/filter.c
index e8486ba601ea..5d2ac2b9d1c4 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1409,16 +1409,19 @@ static u64 bpf_skb_load_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
unsigned int len = (unsigned int) r4;
void *ptr;
- if (unlikely((u32) offset > 0xffff || len > MAX_BPF_STACK))
- return -EFAULT;
+ if (unlikely((u32) offset > 0xffff))
+ goto err_clear;
ptr = skb_header_pointer(skb, offset, len, to);
if (unlikely(!ptr))
- return -EFAULT;
+ goto err_clear;
if (ptr != to)
memcpy(to, ptr, len);
return 0;
+err_clear:
+ memset(to, 0, len);
+ return -EFAULT;
}
static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
@@ -1427,7 +1430,7 @@ 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_STACK,
+ .arg3_type = ARG_PTR_TO_RAW_STACK,
.arg4_type = ARG_CONST_STACK_SIZE,
};
@@ -1756,12 +1759,19 @@ static u64 bpf_skb_get_tunnel_key(u64 r1, u64 r2, u64 size, u64 flags, u64 r5)
struct bpf_tunnel_key *to = (struct bpf_tunnel_key *) (long) r2;
const struct ip_tunnel_info *info = skb_tunnel_info(skb);
u8 compat[sizeof(struct bpf_tunnel_key)];
+ void *to_orig = to;
+ int err;
- if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6))))
- return -EINVAL;
- if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags))
- return -EPROTO;
+ if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
+ err = -EINVAL;
+ goto err_clear;
+ }
+ if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
+ err = -EPROTO;
+ goto err_clear;
+ }
if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
+ err = -EINVAL;
switch (size) {
case offsetof(struct bpf_tunnel_key, tunnel_label):
case offsetof(struct bpf_tunnel_key, tunnel_ext):
@@ -1771,12 +1781,12 @@ static u64 bpf_skb_get_tunnel_key(u64 r1, u64 r2, u64 size, u64 flags, u64 r5)
* a common path later on.
*/
if (ip_tunnel_info_af(info) != AF_INET)
- return -EINVAL;
+ goto err_clear;
set_compat:
to = (struct bpf_tunnel_key *)compat;
break;
default:
- return -EINVAL;
+ goto err_clear;
}
}
@@ -1793,9 +1803,12 @@ set_compat:
}
if (unlikely(size != sizeof(struct bpf_tunnel_key)))
- memcpy((void *)(long) r2, to, size);
+ memcpy(to_orig, to, size);
return 0;
+err_clear:
+ memset(to_orig, 0, size);
+ return err;
}
static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
@@ -1803,7 +1816,7 @@ 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_STACK,
+ .arg2_type = ARG_PTR_TO_RAW_STACK,
.arg3_type = ARG_CONST_STACK_SIZE,
.arg4_type = ARG_ANYTHING,
};
@@ -1813,16 +1826,26 @@ static u64 bpf_skb_get_tunnel_opt(u64 r1, u64 r2, u64 size, u64 r4, u64 r5)
struct sk_buff *skb = (struct sk_buff *) (long) r1;
u8 *to = (u8 *) (long) r2;
const struct ip_tunnel_info *info = skb_tunnel_info(skb);
+ int err;
if (unlikely(!info ||
- !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)))
- return -ENOENT;
- if (unlikely(size < info->options_len))
- return -ENOMEM;
+ !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
+ err = -ENOENT;
+ goto err_clear;
+ }
+ if (unlikely(size < info->options_len)) {
+ err = -ENOMEM;
+ goto err_clear;
+ }
ip_tunnel_info_opts_get(to, info);
+ if (size > info->options_len)
+ memset(to + info->options_len, 0, size - info->options_len);
return info->options_len;
+err_clear:
+ memset(to, 0, size);
+ return err;
}
static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
@@ -1830,7 +1853,7 @@ 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_STACK,
+ .arg2_type = ARG_PTR_TO_RAW_STACK,
.arg3_type = ARG_CONST_STACK_SIZE,
};