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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-30 14:28:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-30 14:28:05 -0700
commit4de593fb965fc2bd11a0b767e0c65ff43540a6e4 (patch)
treea40d3ae164c2e98072bad55fd1efdfdf11eec8de /arch
parent115f6134a050bb098414f38555a5ab780ebbfef0 (diff)
parent35306eb23814444bd4021f8a1c3047d3cb0c8b2b (diff)
Merge tag 'net-5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Jakub Kicinski: "Networking fixes, including fixes from mac80211, netfilter and bpf. Current release - regressions: - bpf, cgroup: assign cgroup in cgroup_sk_alloc when called from interrupt - mdio: revert mechanical patches which broke handling of optional resources - dev_addr_list: prevent address duplication Previous releases - regressions: - sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb (NULL deref) - Revert "mac80211: do not use low data rates for data frames with no ack flag", fixing broadcast transmissions - mac80211: fix use-after-free in CCMP/GCMP RX - netfilter: include zone id in tuple hash again, minimize collisions - netfilter: nf_tables: unlink table before deleting it (race -> UAF) - netfilter: log: work around missing softdep backend module - mptcp: don't return sockets in foreign netns - sched: flower: protect fl_walk() with rcu (race -> UAF) - ixgbe: fix NULL pointer dereference in ixgbe_xdp_setup - smsc95xx: fix stalled rx after link change - enetc: fix the incorrect clearing of IF_MODE bits - ipv4: fix rtnexthop len when RTA_FLOW is present - dsa: mv88e6xxx: 6161: use correct MAX MTU config method for this SKU - e100: fix length calculation & buffer overrun in ethtool::get_regs Previous releases - always broken: - mac80211: fix using stale frag_tail skb pointer in A-MSDU tx - mac80211: drop frames from invalid MAC address in ad-hoc mode - af_unix: fix races in sk_peer_pid and sk_peer_cred accesses (race -> UAF) - bpf, x86: Fix bpf mapping of atomic fetch implementation - bpf: handle return value of BPF_PROG_TYPE_STRUCT_OPS prog - netfilter: ip6_tables: zero-initialize fragment offset - mhi: fix error path in mhi_net_newlink - af_unix: return errno instead of NULL in unix_create1() when over the fs.file-max limit Misc: - bpf: exempt CAP_BPF from checks against bpf_jit_limit - netfilter: conntrack: make max chain length random, prevent guessing buckets by attackers - netfilter: nf_nat_masquerade: make async masq_inet6_event handling generic, defer conntrack walk to work queue (prevent hogging RTNL lock)" * tag 'net-5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (77 commits) af_unix: fix races in sk_peer_pid and sk_peer_cred accesses net: stmmac: fix EEE init issue when paired with EEE capable PHYs net: dev_addr_list: handle first address in __hw_addr_add_ex net: sched: flower: protect fl_walk() with rcu net: introduce and use lock_sock_fast_nested() net: phy: bcm7xxx: Fixed indirect MMD operations net: hns3: disable firmware compatible features when uninstall PF net: hns3: fix always enable rx vlan filter problem after selftest net: hns3: PF enable promisc for VF when mac table is overflow net: hns3: fix show wrong state when add existing uc mac address net: hns3: fix mixed flag HCLGE_FLAG_MQPRIO_ENABLE and HCLGE_FLAG_DCB_ENABLE net: hns3: don't rollback when destroy mqprio fail net: hns3: remove tc enable checking net: hns3: do not allow call hns3_nic_net_open repeatedly ixgbe: Fix NULL pointer dereference in ixgbe_xdp_setup net: bridge: mcast: Associate the seqcount with its protecting lock. net: mdio-ipq4019: Fix the error for an optional regs resource net: hns3: fix hclge_dbg_dump_tm_pg() stack usage net: mdio: mscc-miim: Fix the mdio controller af_unix: Return errno instead of NULL in unix_create1(). ...
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/net/bpf_jit.c57
-rw-r--r--arch/x86/net/bpf_jit_comp.c66
2 files changed, 91 insertions, 32 deletions
diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c
index 0af88622c619..cb6d22439f71 100644
--- a/arch/mips/net/bpf_jit.c
+++ b/arch/mips/net/bpf_jit.c
@@ -662,6 +662,11 @@ static void build_epilogue(struct jit_ctx *ctx)
((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative : func) : \
func##_positive)
+static bool is_bad_offset(int b_off)
+{
+ return b_off > 0x1ffff || b_off < -0x20000;
+}
+
static int build_body(struct jit_ctx *ctx)
{
const struct bpf_prog *prog = ctx->skf;
@@ -728,7 +733,10 @@ load_common:
/* Load return register on DS for failures */
emit_reg_move(r_ret, r_zero, ctx);
/* Return with error */
- emit_b(b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_b(b_off, ctx);
emit_nop(ctx);
break;
case BPF_LD | BPF_W | BPF_IND:
@@ -775,8 +783,10 @@ load_ind:
emit_jalr(MIPS_R_RA, r_s0, ctx);
emit_reg_move(MIPS_R_A0, r_skb, ctx); /* delay slot */
/* Check the error value */
- emit_bcond(MIPS_COND_NE, r_ret, 0,
- b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_bcond(MIPS_COND_NE, r_ret, 0, b_off, ctx);
emit_reg_move(r_ret, r_zero, ctx);
/* We are good */
/* X <- P[1:K] & 0xf */
@@ -855,8 +865,10 @@ load_ind:
/* A /= X */
ctx->flags |= SEEN_X | SEEN_A;
/* Check if r_X is zero */
- emit_bcond(MIPS_COND_EQ, r_X, r_zero,
- b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_bcond(MIPS_COND_EQ, r_X, r_zero, b_off, ctx);
emit_load_imm(r_ret, 0, ctx); /* delay slot */
emit_div(r_A, r_X, ctx);
break;
@@ -864,8 +876,10 @@ load_ind:
/* A %= X */
ctx->flags |= SEEN_X | SEEN_A;
/* Check if r_X is zero */
- emit_bcond(MIPS_COND_EQ, r_X, r_zero,
- b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_bcond(MIPS_COND_EQ, r_X, r_zero, b_off, ctx);
emit_load_imm(r_ret, 0, ctx); /* delay slot */
emit_mod(r_A, r_X, ctx);
break;
@@ -926,7 +940,10 @@ load_ind:
break;
case BPF_JMP | BPF_JA:
/* pc += K */
- emit_b(b_imm(i + k + 1, ctx), ctx);
+ b_off = b_imm(i + k + 1, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_b(b_off, ctx);
emit_nop(ctx);
break;
case BPF_JMP | BPF_JEQ | BPF_K:
@@ -1056,12 +1073,16 @@ jmp_cmp:
break;
case BPF_RET | BPF_A:
ctx->flags |= SEEN_A;
- if (i != prog->len - 1)
+ if (i != prog->len - 1) {
/*
* If this is not the last instruction
* then jump to the epilogue
*/
- emit_b(b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_b(b_off, ctx);
+ }
emit_reg_move(r_ret, r_A, ctx); /* delay slot */
break;
case BPF_RET | BPF_K:
@@ -1075,7 +1096,10 @@ jmp_cmp:
* If this is not the last instruction
* then jump to the epilogue
*/
- emit_b(b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_b(b_off, ctx);
emit_nop(ctx);
}
break;
@@ -1133,8 +1157,10 @@ jmp_cmp:
/* Load *dev pointer */
emit_load_ptr(r_s0, r_skb, off, ctx);
/* error (0) in the delay slot */
- emit_bcond(MIPS_COND_EQ, r_s0, r_zero,
- b_imm(prog->len, ctx), ctx);
+ b_off = b_imm(prog->len, ctx);
+ if (is_bad_offset(b_off))
+ return -E2BIG;
+ emit_bcond(MIPS_COND_EQ, r_s0, r_zero, b_off, ctx);
emit_reg_move(r_ret, r_zero, ctx);
if (code == (BPF_ANC | SKF_AD_IFINDEX)) {
BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
@@ -1244,7 +1270,10 @@ void bpf_jit_compile(struct bpf_prog *fp)
/* Generate the actual JIT code */
build_prologue(&ctx);
- build_body(&ctx);
+ if (build_body(&ctx)) {
+ module_memfree(ctx.target);
+ goto out;
+ }
build_epilogue(&ctx);
/* Update the icache */
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 0fe6aacef3db..9ea57389c554 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1341,9 +1341,10 @@ st: if (is_imm8(insn->off))
if (insn->imm == (BPF_AND | BPF_FETCH) ||
insn->imm == (BPF_OR | BPF_FETCH) ||
insn->imm == (BPF_XOR | BPF_FETCH)) {
- u8 *branch_target;
bool is64 = BPF_SIZE(insn->code) == BPF_DW;
u32 real_src_reg = src_reg;
+ u32 real_dst_reg = dst_reg;
+ u8 *branch_target;
/*
* Can't be implemented with a single x86 insn.
@@ -1354,11 +1355,13 @@ st: if (is_imm8(insn->off))
emit_mov_reg(&prog, true, BPF_REG_AX, BPF_REG_0);
if (src_reg == BPF_REG_0)
real_src_reg = BPF_REG_AX;
+ if (dst_reg == BPF_REG_0)
+ real_dst_reg = BPF_REG_AX;
branch_target = prog;
/* Load old value */
emit_ldx(&prog, BPF_SIZE(insn->code),
- BPF_REG_0, dst_reg, insn->off);
+ BPF_REG_0, real_dst_reg, insn->off);
/*
* Perform the (commutative) operation locally,
* put the result in the AUX_REG.
@@ -1369,7 +1372,8 @@ st: if (is_imm8(insn->off))
add_2reg(0xC0, AUX_REG, real_src_reg));
/* Attempt to swap in new value */
err = emit_atomic(&prog, BPF_CMPXCHG,
- dst_reg, AUX_REG, insn->off,
+ real_dst_reg, AUX_REG,
+ insn->off,
BPF_SIZE(insn->code));
if (WARN_ON(err))
return err;
@@ -1383,11 +1387,10 @@ st: if (is_imm8(insn->off))
/* Restore R0 after clobbering RAX */
emit_mov_reg(&prog, true, BPF_REG_0, BPF_REG_AX);
break;
-
}
err = emit_atomic(&prog, insn->imm, dst_reg, src_reg,
- insn->off, BPF_SIZE(insn->code));
+ insn->off, BPF_SIZE(insn->code));
if (err)
return err;
break;
@@ -1744,7 +1747,7 @@ static void restore_regs(const struct btf_func_model *m, u8 **prog, int nr_args,
}
static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog,
- struct bpf_prog *p, int stack_size, bool mod_ret)
+ struct bpf_prog *p, int stack_size, bool save_ret)
{
u8 *prog = *pprog;
u8 *jmp_insn;
@@ -1777,11 +1780,15 @@ static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog,
if (emit_call(&prog, p->bpf_func, prog))
return -EINVAL;
- /* BPF_TRAMP_MODIFY_RETURN trampolines can modify the return
+ /*
+ * BPF_TRAMP_MODIFY_RETURN trampolines can modify the return
* of the previous call which is then passed on the stack to
* the next BPF program.
+ *
+ * BPF_TRAMP_FENTRY trampoline may need to return the return
+ * value of BPF_PROG_TYPE_STRUCT_OPS prog.
*/
- if (mod_ret)
+ if (save_ret)
emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_0, -8);
/* replace 2 nops with JE insn, since jmp target is known */
@@ -1828,13 +1835,15 @@ static int emit_cond_near_jump(u8 **pprog, void *func, void *ip, u8 jmp_cond)
}
static int invoke_bpf(const struct btf_func_model *m, u8 **pprog,
- struct bpf_tramp_progs *tp, int stack_size)
+ struct bpf_tramp_progs *tp, int stack_size,
+ bool save_ret)
{
int i;
u8 *prog = *pprog;
for (i = 0; i < tp->nr_progs; i++) {
- if (invoke_bpf_prog(m, &prog, tp->progs[i], stack_size, false))
+ if (invoke_bpf_prog(m, &prog, tp->progs[i], stack_size,
+ save_ret))
return -EINVAL;
}
*pprog = prog;
@@ -1877,6 +1886,23 @@ static int invoke_bpf_mod_ret(const struct btf_func_model *m, u8 **pprog,
return 0;
}
+static bool is_valid_bpf_tramp_flags(unsigned int flags)
+{
+ if ((flags & BPF_TRAMP_F_RESTORE_REGS) &&
+ (flags & BPF_TRAMP_F_SKIP_FRAME))
+ return false;
+
+ /*
+ * BPF_TRAMP_F_RET_FENTRY_RET is only used by bpf_struct_ops,
+ * and it must be used alone.
+ */
+ if ((flags & BPF_TRAMP_F_RET_FENTRY_RET) &&
+ (flags & ~BPF_TRAMP_F_RET_FENTRY_RET))
+ return false;
+
+ return true;
+}
+
/* Example:
* __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
* its 'struct btf_func_model' will be nr_args=2
@@ -1949,17 +1975,19 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
struct bpf_tramp_progs *fmod_ret = &tprogs[BPF_TRAMP_MODIFY_RETURN];
u8 **branches = NULL;
u8 *prog;
+ bool save_ret;
/* x86-64 supports up to 6 arguments. 7+ can be added in the future */
if (nr_args > 6)
return -ENOTSUPP;
- if ((flags & BPF_TRAMP_F_RESTORE_REGS) &&
- (flags & BPF_TRAMP_F_SKIP_FRAME))
+ if (!is_valid_bpf_tramp_flags(flags))
return -EINVAL;
- if (flags & BPF_TRAMP_F_CALL_ORIG)
- stack_size += 8; /* room for return value of orig_call */
+ /* room for return value of orig_call or fentry prog */
+ save_ret = flags & (BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_RET_FENTRY_RET);
+ if (save_ret)
+ stack_size += 8;
if (flags & BPF_TRAMP_F_IP_ARG)
stack_size += 8; /* room for IP address argument */
@@ -2005,7 +2033,8 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
}
if (fentry->nr_progs)
- if (invoke_bpf(m, &prog, fentry, stack_size))
+ if (invoke_bpf(m, &prog, fentry, stack_size,
+ flags & BPF_TRAMP_F_RET_FENTRY_RET))
return -EINVAL;
if (fmod_ret->nr_progs) {
@@ -2052,7 +2081,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
}
if (fexit->nr_progs)
- if (invoke_bpf(m, &prog, fexit, stack_size)) {
+ if (invoke_bpf(m, &prog, fexit, stack_size, false)) {
ret = -EINVAL;
goto cleanup;
}
@@ -2072,9 +2101,10 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
ret = -EINVAL;
goto cleanup;
}
- /* restore original return value back into RAX */
- emit_ldx(&prog, BPF_DW, BPF_REG_0, BPF_REG_FP, -8);
}
+ /* restore return value of orig_call or fentry prog back into RAX */
+ if (save_ret)
+ emit_ldx(&prog, BPF_DW, BPF_REG_0, BPF_REG_FP, -8);
EMIT1(0x5B); /* pop rbx */
EMIT1(0xC9); /* leave */

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