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Message-ID: <20180311164552.GB23941@kroah.com>
Date: Sun, 11 Mar 2018 17:45:52 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
torvalds@...ux-foundation.org, stable@...r.kernel.org
Cc: lwn@....net, Jiri Slaby <jslaby@...e.cz>
Subject: Re: Linux 4.14.26
diff --git a/Documentation/virtual/kvm/cpuid.txt b/Documentation/virtual/kvm/cpuid.txt
index 3c65feb83010..a81c97a4b4a5 100644
--- a/Documentation/virtual/kvm/cpuid.txt
+++ b/Documentation/virtual/kvm/cpuid.txt
@@ -54,6 +54,10 @@ KVM_FEATURE_PV_UNHALT || 7 || guest checks this feature bit
|| || before enabling paravirtualized
|| || spinlock support.
------------------------------------------------------------------------------
+KVM_FEATURE_ASYNC_PF_VMEXIT || 10 || paravirtualized async PF VM exit
+ || || can be enabled by setting bit 2
+ || || when writing to msr 0x4b564d02
+------------------------------------------------------------------------------
KVM_FEATURE_CLOCKSOURCE_STABLE_BIT || 24 || host will warn if no guest-side
|| || per-cpu warps are expected in
|| || kvmclock.
diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt
index 1ebecc115dc6..f3f0d57ced8e 100644
--- a/Documentation/virtual/kvm/msr.txt
+++ b/Documentation/virtual/kvm/msr.txt
@@ -170,7 +170,8 @@ MSR_KVM_ASYNC_PF_EN: 0x4b564d02
when asynchronous page faults are enabled on the vcpu 0 when
disabled. Bit 1 is 1 if asynchronous page faults can be injected
when vcpu is in cpl == 0. Bit 2 is 1 if asynchronous page faults
- are delivered to L1 as #PF vmexits.
+ are delivered to L1 as #PF vmexits. Bit 2 can be set only if
+ KVM_FEATURE_ASYNC_PF_VMEXIT is present in CPUID.
First 4 byte of 64 byte memory location will be written to by
the hypervisor at the time of asynchronous page fault (APF)
diff --git a/Makefile b/Makefile
index 0fdae0f455ef..666182dda187 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
VERSION = 4
PATCHLEVEL = 14
-SUBLEVEL = 25
+SUBLEVEL = 26
EXTRAVERSION =
NAME = Petit Gorille
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index bb32f7f6dd0f..be155f70f108 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -238,8 +238,9 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
off = offsetof(struct bpf_array, map.max_entries);
emit_a64_mov_i64(tmp, off, ctx);
emit(A64_LDR32(tmp, r2, tmp), ctx);
+ emit(A64_MOV(0, r3, r3), ctx);
emit(A64_CMP(0, r3, tmp), ctx);
- emit(A64_B_(A64_COND_GE, jmp_offset), ctx);
+ emit(A64_B_(A64_COND_CS, jmp_offset), ctx);
/* if (tail_call_cnt > MAX_TAIL_CALL_CNT)
* goto out;
@@ -247,7 +248,7 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
*/
emit_a64_mov_i64(tmp, MAX_TAIL_CALL_CNT, ctx);
emit(A64_CMP(1, tcc, tmp), ctx);
- emit(A64_B_(A64_COND_GT, jmp_offset), ctx);
+ emit(A64_B_(A64_COND_HI, jmp_offset), ctx);
emit(A64_ADD_I(1, tcc, tcc, 1), ctx);
/* prog = array->ptrs[index];
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 5d115bd32539..bd0786c23109 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -241,6 +241,7 @@ static void bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32
* goto out;
*/
PPC_LWZ(b2p[TMP_REG_1], b2p_bpf_array, offsetof(struct bpf_array, map.max_entries));
+ PPC_RLWINM(b2p_index, b2p_index, 0, 0, 31);
PPC_CMPLW(b2p_index, b2p[TMP_REG_1]);
PPC_BCC(COND_GE, out);
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 76b058533e47..81a1be326571 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -177,4 +177,41 @@ static inline void indirect_branch_prediction_barrier(void)
}
#endif /* __ASSEMBLY__ */
+
+/*
+ * Below is used in the eBPF JIT compiler and emits the byte sequence
+ * for the following assembly:
+ *
+ * With retpolines configured:
+ *
+ * callq do_rop
+ * spec_trap:
+ * pause
+ * lfence
+ * jmp spec_trap
+ * do_rop:
+ * mov %rax,(%rsp)
+ * retq
+ *
+ * Without retpolines configured:
+ *
+ * jmp *%rax
+ */
+#ifdef CONFIG_RETPOLINE
+# define RETPOLINE_RAX_BPF_JIT_SIZE 17
+# define RETPOLINE_RAX_BPF_JIT() \
+ EMIT1_off32(0xE8, 7); /* callq do_rop */ \
+ /* spec_trap: */ \
+ EMIT2(0xF3, 0x90); /* pause */ \
+ EMIT3(0x0F, 0xAE, 0xE8); /* lfence */ \
+ EMIT2(0xEB, 0xF9); /* jmp spec_trap */ \
+ /* do_rop: */ \
+ EMIT4(0x48, 0x89, 0x04, 0x24); /* mov %rax,(%rsp) */ \
+ EMIT1(0xC3); /* retq */
+#else
+# define RETPOLINE_RAX_BPF_JIT_SIZE 2
+# define RETPOLINE_RAX_BPF_JIT() \
+ EMIT2(0xFF, 0xE0); /* jmp *%rax */
+#endif
+
#endif /* _ASM_X86_NOSPEC_BRANCH_H_ */
diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h
index 554aa8f24f91..341db0462b85 100644
--- a/arch/x86/include/uapi/asm/kvm_para.h
+++ b/arch/x86/include/uapi/asm/kvm_para.h
@@ -25,6 +25,7 @@
#define KVM_FEATURE_STEAL_TIME 5
#define KVM_FEATURE_PV_EOI 6
#define KVM_FEATURE_PV_UNHALT 7
+#define KVM_FEATURE_ASYNC_PF_VMEXIT 10
/* The last 8 bits are used to indicate how to interpret the flags field
* in pvclock structure. If no bits are set, all flags are ignored.
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index a94de09edbed..652bdd867782 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -341,10 +341,10 @@ static void kvm_guest_cpu_init(void)
#endif
pa |= KVM_ASYNC_PF_ENABLED;
- /* Async page fault support for L1 hypervisor is optional */
- if (wrmsr_safe(MSR_KVM_ASYNC_PF_EN,
- (pa | KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT) & 0xffffffff, pa >> 32) < 0)
- wrmsrl(MSR_KVM_ASYNC_PF_EN, pa);
+ if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF_VMEXIT))
+ pa |= KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT;
+
+ wrmsrl(MSR_KVM_ASYNC_PF_EN, pa);
__this_cpu_write(apf_reason.enabled, 1);
printk(KERN_INFO"KVM setup async PF for cpu %d\n",
smp_processor_id());
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 13f5d4217e4f..4f544f2a7b06 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -597,7 +597,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
(1 << KVM_FEATURE_ASYNC_PF) |
(1 << KVM_FEATURE_PV_EOI) |
(1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
- (1 << KVM_FEATURE_PV_UNHALT);
+ (1 << KVM_FEATURE_PV_UNHALT) |
+ (1 << KVM_FEATURE_ASYNC_PF_VMEXIT);
if (sched_info_on())
entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 0554e8aef4d5..940aac70b4da 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -13,6 +13,7 @@
#include <linux/if_vlan.h>
#include <asm/cacheflush.h>
#include <asm/set_memory.h>
+#include <asm/nospec-branch.h>
#include <linux/bpf.h>
int bpf_jit_enable __read_mostly;
@@ -287,7 +288,7 @@ static void emit_bpf_tail_call(u8 **pprog)
EMIT2(0x89, 0xD2); /* mov edx, edx */
EMIT3(0x39, 0x56, /* cmp dword ptr [rsi + 16], edx */
offsetof(struct bpf_array, map.max_entries));
-#define OFFSET1 43 /* number of bytes to jump */
+#define OFFSET1 (41 + RETPOLINE_RAX_BPF_JIT_SIZE) /* number of bytes to jump */
EMIT2(X86_JBE, OFFSET1); /* jbe out */
label1 = cnt;
@@ -296,7 +297,7 @@ static void emit_bpf_tail_call(u8 **pprog)
*/
EMIT2_off32(0x8B, 0x85, 36); /* mov eax, dword ptr [rbp + 36] */
EMIT3(0x83, 0xF8, MAX_TAIL_CALL_CNT); /* cmp eax, MAX_TAIL_CALL_CNT */
-#define OFFSET2 32
+#define OFFSET2 (30 + RETPOLINE_RAX_BPF_JIT_SIZE)
EMIT2(X86_JA, OFFSET2); /* ja out */
label2 = cnt;
EMIT3(0x83, 0xC0, 0x01); /* add eax, 1 */
@@ -310,7 +311,7 @@ static void emit_bpf_tail_call(u8 **pprog)
* goto out;
*/
EMIT3(0x48, 0x85, 0xC0); /* test rax,rax */
-#define OFFSET3 10
+#define OFFSET3 (8 + RETPOLINE_RAX_BPF_JIT_SIZE)
EMIT2(X86_JE, OFFSET3); /* je out */
label3 = cnt;
@@ -323,7 +324,7 @@ static void emit_bpf_tail_call(u8 **pprog)
* rdi == ctx (1st arg)
* rax == prog->bpf_func + prologue_size
*/
- EMIT2(0xFF, 0xE0); /* jmp rax */
+ RETPOLINE_RAX_BPF_JIT();
/* out: */
BUILD_BUG_ON(cnt - label1 != OFFSET1);
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index a4ae1ca44a57..f57d0bdf3c9e 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -23,8 +23,10 @@ static void bpf_array_free_percpu(struct bpf_array *array)
{
int i;
- for (i = 0; i < array->map.max_entries; i++)
+ for (i = 0; i < array->map.max_entries; i++) {
free_percpu(array->pptrs[i]);
+ cond_resched();
+ }
}
static int bpf_array_alloc_percpu(struct bpf_array *array)
@@ -40,6 +42,7 @@ static int bpf_array_alloc_percpu(struct bpf_array *array)
return -ENOMEM;
}
array->pptrs[i] = ptr;
+ cond_resched();
}
return 0;
@@ -49,11 +52,11 @@ static int bpf_array_alloc_percpu(struct bpf_array *array)
static struct bpf_map *array_map_alloc(union bpf_attr *attr)
{
bool percpu = attr->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
- int numa_node = bpf_map_attr_numa_node(attr);
+ int ret, numa_node = bpf_map_attr_numa_node(attr);
u32 elem_size, index_mask, max_entries;
bool unpriv = !capable(CAP_SYS_ADMIN);
+ u64 cost, array_size, mask64;
struct bpf_array *array;
- u64 array_size, mask64;
/* check sanity of attributes */
if (attr->max_entries == 0 || attr->key_size != 4 ||
@@ -97,8 +100,19 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
array_size += (u64) max_entries * elem_size;
/* make sure there is no u32 overflow later in round_up() */
- if (array_size >= U32_MAX - PAGE_SIZE)
+ cost = array_size;
+ if (cost >= U32_MAX - PAGE_SIZE)
return ERR_PTR(-ENOMEM);
+ if (percpu) {
+ cost += (u64)attr->max_entries * elem_size * num_possible_cpus();
+ if (cost >= U32_MAX - PAGE_SIZE)
+ return ERR_PTR(-ENOMEM);
+ }
+ cost = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT;
+
+ ret = bpf_map_precharge_memlock(cost);
+ if (ret < 0)
+ return ERR_PTR(ret);
/* allocate all map elements and zero-initialize them */
array = bpf_map_area_alloc(array_size, numa_node);
@@ -114,20 +128,13 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
array->map.max_entries = attr->max_entries;
array->map.map_flags = attr->map_flags;
array->map.numa_node = numa_node;
+ array->map.pages = cost;
array->elem_size = elem_size;
- if (!percpu)
- goto out;
-
- array_size += (u64) attr->max_entries * elem_size * num_possible_cpus();
-
- if (array_size >= U32_MAX - PAGE_SIZE ||
- bpf_array_alloc_percpu(array)) {
+ if (percpu && bpf_array_alloc_percpu(array)) {
bpf_map_area_free(array);
return ERR_PTR(-ENOMEM);
}
-out:
- array->map.pages = round_up(array_size, PAGE_SIZE) >> PAGE_SHIFT;
return &array->map;
}
diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c
index 1b767844a76f..c28c584b734e 100644
--- a/kernel/bpf/lpm_trie.c
+++ b/kernel/bpf/lpm_trie.c
@@ -470,7 +470,10 @@ static void trie_free(struct bpf_map *map)
struct lpm_trie_node __rcu **slot;
struct lpm_trie_node *node;
- raw_spin_lock(&trie->lock);
+ /* Wait for outstanding programs to complete
+ * update/lookup/delete/get_next_key and free the trie.
+ */
+ synchronize_rcu();
/* Always start at the root and walk down to a node that has no
* children. Then free that node, nullify its reference in the parent
@@ -481,10 +484,9 @@ static void trie_free(struct bpf_map *map)
slot = &trie->root;
for (;;) {
- node = rcu_dereference_protected(*slot,
- lockdep_is_held(&trie->lock));
+ node = rcu_dereference_protected(*slot, 1);
if (!node)
- goto unlock;
+ goto out;
if (rcu_access_pointer(node->child[0])) {
slot = &node->child[0];
@@ -502,8 +504,8 @@ static void trie_free(struct bpf_map *map)
}
}
-unlock:
- raw_spin_unlock(&trie->lock);
+out:
+ kfree(trie);
}
static int trie_get_next_key(struct bpf_map *map, void *key, void *next_key)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index b5ae6488b890..3ceb269c0ebd 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -993,6 +993,13 @@ static bool is_ctx_reg(struct bpf_verifier_env *env, int regno)
return reg->type == PTR_TO_CTX;
}
+static bool is_pkt_reg(struct bpf_verifier_env *env, int regno)
+{
+ const struct bpf_reg_state *reg = &env->cur_state.regs[regno];
+
+ return reg->type == PTR_TO_PACKET;
+}
+
static int check_pkt_ptr_alignment(const struct bpf_reg_state *reg,
int off, int size, bool strict)
{
@@ -1050,10 +1057,10 @@ static int check_generic_ptr_alignment(const struct bpf_reg_state *reg,
}
static int check_ptr_alignment(struct bpf_verifier_env *env,
- const struct bpf_reg_state *reg,
- int off, int size)
+ const struct bpf_reg_state *reg, int off,
+ int size, bool strict_alignment_once)
{
- bool strict = env->strict_alignment;
+ bool strict = env->strict_alignment || strict_alignment_once;
const char *pointer_desc = "";
switch (reg->type) {
@@ -1109,9 +1116,9 @@ static void coerce_reg_to_size(struct bpf_reg_state *reg, int size)
* if t==write && value_regno==-1, some unknown value is stored into memory
* if t==read && value_regno==-1, don't care what we read from memory
*/
-static int check_mem_access(struct bpf_verifier_env *env, int insn_idx, u32 regno, int off,
- int bpf_size, enum bpf_access_type t,
- int value_regno)
+static int check_mem_access(struct bpf_verifier_env *env, int insn_idx, u32 regno,
+ int off, int bpf_size, enum bpf_access_type t,
+ int value_regno, bool strict_alignment_once)
{
struct bpf_verifier_state *state = &env->cur_state;
struct bpf_reg_state *reg = &state->regs[regno];
@@ -1122,7 +1129,7 @@ static int check_mem_access(struct bpf_verifier_env *env, int insn_idx, u32 regn
return size;
/* alignment checks will add in reg->off themselves */
- err = check_ptr_alignment(env, reg, off, size);
+ err = check_ptr_alignment(env, reg, off, size, strict_alignment_once);
if (err)
return err;
@@ -1265,21 +1272,23 @@ static int check_xadd(struct bpf_verifier_env *env, int insn_idx, struct bpf_ins
return -EACCES;
}
- if (is_ctx_reg(env, insn->dst_reg)) {
- verbose("BPF_XADD stores into R%d context is not allowed\n",
- insn->dst_reg);
+ if (is_ctx_reg(env, insn->dst_reg) ||
+ is_pkt_reg(env, insn->dst_reg)) {
+ verbose("BPF_XADD stores into R%d %s is not allowed\n",
+ insn->dst_reg, is_ctx_reg(env, insn->dst_reg) ?
+ "context" : "packet");
return -EACCES;
}
/* check whether atomic_add can read the memory */
err = check_mem_access(env, insn_idx, insn->dst_reg, insn->off,
- BPF_SIZE(insn->code), BPF_READ, -1);
+ BPF_SIZE(insn->code), BPF_READ, -1, true);
if (err)
return err;
/* check whether atomic_add can write into the same memory */
return check_mem_access(env, insn_idx, insn->dst_reg, insn->off,
- BPF_SIZE(insn->code), BPF_WRITE, -1);
+ BPF_SIZE(insn->code), BPF_WRITE, -1, true);
}
/* Does this register contain a constant zero? */
@@ -1735,7 +1744,8 @@ static int check_call(struct bpf_verifier_env *env, int func_id, int insn_idx)
* is inferred from register state.
*/
for (i = 0; i < meta.access_size; i++) {
- err = check_mem_access(env, insn_idx, meta.regno, i, BPF_B, BPF_WRITE, -1);
+ err = check_mem_access(env, insn_idx, meta.regno, i, BPF_B,
+ BPF_WRITE, -1, false);
if (err)
return err;
}
@@ -3801,7 +3811,7 @@ static int do_check(struct bpf_verifier_env *env)
*/
err = check_mem_access(env, insn_idx, insn->src_reg, insn->off,
BPF_SIZE(insn->code), BPF_READ,
- insn->dst_reg);
+ insn->dst_reg, false);
if (err)
return err;
@@ -3853,7 +3863,7 @@ static int do_check(struct bpf_verifier_env *env)
/* check that memory (dst_reg + off) is writeable */
err = check_mem_access(env, insn_idx, insn->dst_reg, insn->off,
BPF_SIZE(insn->code), BPF_WRITE,
- insn->src_reg);
+ insn->src_reg, false);
if (err)
return err;
@@ -3888,7 +3898,7 @@ static int do_check(struct bpf_verifier_env *env)
/* check that memory (dst_reg + off) is writeable */
err = check_mem_access(env, insn_idx, insn->dst_reg, insn->off,
BPF_SIZE(insn->code), BPF_WRITE,
- -1);
+ -1, false);
if (err)
return err;
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index c55d265489ca..9167ee976314 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -2257,6 +2257,32 @@ static struct bpf_test tests[] = {
.result_unpriv = REJECT,
.result = ACCEPT,
},
+ {
+ "runtime/jit: pass negative index to tail_call",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_3, -1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_tail_call),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_prog = { 1 },
+ .result = ACCEPT,
+ },
+ {
+ "runtime/jit: pass > 32bit index to tail_call",
+ .insns = {
+ BPF_LD_IMM64(BPF_REG_3, 0x100000000ULL),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_tail_call),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_prog = { 2 },
+ .result = ACCEPT,
+ },
{
"stack pointer arithmetic",
.insns = {
@@ -7854,6 +7880,64 @@ static struct bpf_test tests[] = {
.prog_type = BPF_PROG_TYPE_XDP,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
+ {
+ "xadd/w check unaligned stack",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 1),
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
+ BPF_STX_XADD(BPF_W, BPF_REG_10, BPF_REG_0, -7),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "misaligned stack access off",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "xadd/w check unaligned map",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_map_lookup_elem),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_IMM(BPF_REG_1, 1),
+ BPF_STX_XADD(BPF_W, BPF_REG_0, BPF_REG_1, 3),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 3),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = REJECT,
+ .errstr = "misaligned value access off",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "xadd/w check unaligned pkt",
+ .insns = {
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
+ offsetof(struct xdp_md, data)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
+ offsetof(struct xdp_md, data_end)),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),
+ BPF_JMP_REG(BPF_JLT, BPF_REG_1, BPF_REG_3, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 99),
+ BPF_JMP_IMM(BPF_JA, 0, 0, 6),
+ BPF_MOV64_IMM(BPF_REG_0, 1),
+ BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
+ BPF_ST_MEM(BPF_W, BPF_REG_2, 3, 0),
+ BPF_STX_XADD(BPF_W, BPF_REG_2, BPF_REG_0, 1),
+ BPF_STX_XADD(BPF_W, BPF_REG_2, BPF_REG_0, 2),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 1),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "BPF_XADD stores into R2 packet",
+ .prog_type = BPF_PROG_TYPE_XDP,
+ },
};
static int probe_filter_length(const struct bpf_insn *fp)
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