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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 20:01:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 20:01:26 -0700
commit087afe8aaf562dc7a53f2577049830d6a3245742 (patch)
tree94fe422e62965b24030019368cb9ec4f9c90cd38 /kernel
parent54cf809b9512be95f53ed4a5e3b631d1ac42f0fa (diff)
parent95829b3a9c0b1d88778b23bc2afdf5a83de066ff (diff)
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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking fixes and more updates from David Miller: 1) Tunneling fixes from Tom Herbert and Alexander Duyck. 2) AF_UNIX updates some struct sock bit fields with the socket lock, whereas setsockopt() sets overlapping ones with locking. Seperate out the synchronized vs. the AF_UNIX unsynchronized ones to avoid corruption. From Andrey Ryabinin. 3) Mount BPF filesystem with mount_nodev rather than mount_ns, from Eric Biederman. 4) A couple kmemdup conversions, from Muhammad Falak R Wani. 5) BPF verifier fixes from Alexei Starovoitov. 6) Don't let tunneled UDP packets get stuck in socket queues, if something goes wrong during the encapsulation just drop the packet rather than signalling an error up the call stack. From Hannes Frederic Sowa. 7) SKB ref after free in batman-adv, from Florian Westphal. 8) TCP iSCSI, ocfs2, rds, and tipc have to disable BH in it's TCP callbacks since the TCP stack runs pre-emptibly now. From Eric Dumazet. 9) Fix crash in fixed_phy_add, from Rabin Vincent. 10) Fix length checks in xen-netback, from Paul Durrant. 11) Fix mixup in KEY vs KEYID macsec attributes, from Sabrina Dubroca. 12) RDS connection spamming bug fixes from Sowmini Varadhan * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (152 commits) net: suppress warnings on dev_alloc_skb uapi glibc compat: fix compilation when !__USE_MISC in glibc udp: prevent skbs lingering in tunnel socket queues bpf: teach verifier to recognize imm += ptr pattern bpf: support decreasing order in direct packet access net: usb: ch9200: use kmemdup ps3_gelic: use kmemdup net:liquidio: use kmemdup bpf: Use mount_nodev not mount_ns to mount the bpf filesystem net: cdc_ncm: update datagram size after changing mtu tuntap: correctly wake up process during uninit intel: Add support for IPv6 IP-in-IP offload ip6_gre: Do not allow segmentation offloads GRE_CSUM is enabled with FOU/GUE RDS: TCP: Avoid rds connection churn from rogue SYNs RDS: TCP: rds_tcp_accept_worker() must exit gracefully when terminating rds-tcp net: sock: move ->sk_shutdown out of bitfields. ipv6: Don't reset inner headers in ip6_tnl_xmit ip4ip6: Support for GSO/GRO ip6ip6: Support for GSO/GRO ipv6: Set features for IPv6 tunnels ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/core.c4
-rw-r--r--kernel/bpf/inode.c2
-rw-r--r--kernel/bpf/verifier.c30
3 files changed, 24 insertions, 12 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f1e8a0def99b..b94a36550591 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -231,7 +231,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
hdr->pages = size / PAGE_SIZE;
hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)),
PAGE_SIZE - sizeof(*hdr));
- start = (prandom_u32() % hole) & ~(alignment - 1);
+ start = (get_random_int() % hole) & ~(alignment - 1);
/* Leave a random number of instructions before BPF code. */
*image_ptr = &hdr->image[start];
@@ -251,7 +251,7 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
struct bpf_insn *to_buff)
{
struct bpf_insn *to = to_buff;
- u32 imm_rnd = prandom_u32();
+ u32 imm_rnd = get_random_int();
s16 off;
BUILD_BUG_ON(BPF_REG_AX + 1 != MAX_BPF_JIT_REG);
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 71b75d9c81da..04be7021f848 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -357,7 +357,7 @@ static int bpf_fill_super(struct super_block *sb, void *data, int silent)
static struct dentry *bpf_mount(struct file_system_type *type, int flags,
const char *dev_name, void *data)
{
- return mount_ns(type, flags, current->nsproxy->mnt_ns, bpf_fill_super);
+ return mount_nodev(type, flags, data, bpf_fill_super);
}
static struct file_system_type bpf_fs_type = {
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index a08d66215245..668e07903c8f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -683,15 +683,11 @@ static int check_packet_access(struct verifier_env *env, u32 regno, int off,
{
struct reg_state *regs = env->cur_state.regs;
struct reg_state *reg = &regs[regno];
- int linear_size = (int) reg->range - (int) reg->off;
- if (linear_size < 0 || linear_size >= MAX_PACKET_OFF) {
- verbose("verifier bug\n");
- return -EFAULT;
- }
- if (off < 0 || off + size > linear_size) {
- verbose("invalid access to packet, off=%d size=%d, allowed=%d\n",
- off, size, linear_size);
+ off += reg->off;
+ if (off < 0 || off + size > reg->range) {
+ verbose("invalid access to packet, off=%d size=%d, R%d(id=%d,off=%d,r=%d)\n",
+ off, size, regno, reg->id, reg->off, reg->range);
return -EACCES;
}
return 0;
@@ -1249,6 +1245,7 @@ static int check_packet_ptr_add(struct verifier_env *env, struct bpf_insn *insn)
struct reg_state *regs = env->cur_state.regs;
struct reg_state *dst_reg = &regs[insn->dst_reg];
struct reg_state *src_reg = &regs[insn->src_reg];
+ struct reg_state tmp_reg;
s32 imm;
if (BPF_SRC(insn->code) == BPF_K) {
@@ -1271,6 +1268,19 @@ add_imm:
*/
dst_reg->off += imm;
} else {
+ if (src_reg->type == PTR_TO_PACKET) {
+ /* R6=pkt(id=0,off=0,r=62) R7=imm22; r7 += r6 */
+ tmp_reg = *dst_reg; /* save r7 state */
+ *dst_reg = *src_reg; /* copy pkt_ptr state r6 into r7 */
+ src_reg = &tmp_reg; /* pretend it's src_reg state */
+ /* if the checks below reject it, the copy won't matter,
+ * since we're rejecting the whole program. If all ok,
+ * then imm22 state will be added to r7
+ * and r7 will be pkt(id=0,off=22,r=62) while
+ * r6 will stay as pkt(id=0,off=0,r=62)
+ */
+ }
+
if (src_reg->type == CONST_IMM) {
/* pkt_ptr += reg where reg is known constant */
imm = src_reg->imm;
@@ -1569,7 +1579,9 @@ static int check_alu_op(struct verifier_env *env, struct bpf_insn *insn)
return 0;
} else if (opcode == BPF_ADD &&
BPF_CLASS(insn->code) == BPF_ALU64 &&
- dst_reg->type == PTR_TO_PACKET) {
+ (dst_reg->type == PTR_TO_PACKET ||
+ (BPF_SRC(insn->code) == BPF_X &&
+ regs[insn->src_reg].type == PTR_TO_PACKET))) {
/* ptr_to_packet += K|X */
return check_packet_ptr_add(env, insn);
} else if (BPF_CLASS(insn->code) == BPF_ALU64 &&