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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

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Alexei Starovoitov says:

====================
pull-request: bpf 2018-02-22

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) two urgent fixes for bpf_tail_call logic for x64 and arm64 JITs, from Daniel.

2) cond_resched points in percpu array alloc/free paths, from Eric.

3) lockdep and other minor fixes, from Yonghong, Arnd, Anders, Li.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-02-23 12:34:18 -05:00
commit 2217009443
10 changed files with 80 additions and 15 deletions
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5
arch/arm64/net/bpf_jit_comp.c
View File

@ -250,8 +250,9 @@ 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;
@ -259,7 +260,7 @@ 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];

37
arch/x86/include/asm/nospec-branch.h
View File

@ -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_ */

9
arch/x86/net/bpf_jit_comp.c
View File

@ -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>
/*
@ -290,7 +291,7 @@ 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;
@ -299,7 +300,7 @@ 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 */
@ -313,7 +314,7 @@ 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;
@ -326,7 +327,7 @@ 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);

5
kernel/bpf/arraymap.c
View File

@ -26,8 +26,10 @@ 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)
@ -43,6 +45,7 @@ static int bpf_array_alloc_percpu(struct bpf_array *array)
return -ENOMEM;
}
array->pptrs[i] = ptr;
cond_resched();
}
return 0;

3
kernel/bpf/lpm_trie.c
View File

@ -569,8 +569,7 @@ 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 out;

6
net/core/filter.c
View File

@ -3381,17 +3381,13 @@ BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
struct sock *sk = bpf_sock->sk;
int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
if (!sk_fullsock(sk))
if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
return -EINVAL;
#ifdef CONFIG_INET
if (val)
tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
#else
return -EINVAL;
#endif
}
static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {

1
tools/testing/selftests/bpf/.gitignore vendored
View File

@ -11,3 +11,4 @@ test_progs
test_tcpbpf_user
test_verifier_log
feature
test_libbpf_open

2
tools/testing/selftests/bpf/test_maps.c
View File

@ -126,6 +126,8 @@ static void test_hashmap_sizes(int task, void *data)
fd = bpf_create_map(BPF_MAP_TYPE_HASH, i, j,
2, map_flags);
if (fd < 0) {
if (errno == ENOMEM)
return;
printf("Failed to create hashmap key=%d value=%d '%s'\n",
i, j, strerror(errno));
exit(1);

1
tools/testing/selftests/bpf/test_tcpbpf_kern.c
View File

@ -5,7 +5,6 @@
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/ip.h>
#include <linux/in6.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/tcp.h>

26
tools/testing/selftests/bpf/test_verifier.c
View File

@ -2586,6 +2586,32 @@ 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 = {