[PATCH v8 bpf-next 9/9] bpf, x86_64: use bpf_jit_binary_pack_alloc

Song Liu
2022-02-01T17:10:41Z

From: Song Liu <songliubraving@fb.com>

Use bpf_jit_binary_pack_alloc in x86_64 jit. The jit engine first writes
the program to the rw buffer. When the jit is done, the program is copied
to the final location with bpf_jit_binary_pack_finalize.

Note that we need to do bpf_tail_call_direct_fixup after finalize.
Therefore, the text_live = false logic in __bpf_arch_text_poke is no
longer needed.

Signed-off-by: Song Liu <songliubraving@fb.com>
---
arch/x86/net/bpf_jit_comp.c | 58 ++++++++++++++++++++-----------------
1 file changed, 31 insertions(+), 27 deletions(-)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index c13d148f7396..643f38b91e30 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -330,8 +330,7 @@ static int emit_jump(u8 **pprog, void *func, void *ip)
}

static int __bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
- void *old_addr, void *new_addr,
- const bool text_live)
+ void *old_addr, void *new_addr)
{
const u8 *nop_insn = x86_nops[5];
u8 old_insn[X86_PATCH_SIZE];
@@ -365,10 +364,7 @@ static int __bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
goto out;
ret = 1;
if (memcmp(ip, new_insn, X86_PATCH_SIZE)) {
- if (text_live)
- text_poke_bp(ip, new_insn, X86_PATCH_SIZE, NULL);
- else
- memcpy(ip, new_insn, X86_PATCH_SIZE);
+ text_poke_bp(ip, new_insn, X86_PATCH_SIZE, NULL);
ret = 0;
}
out:
@@ -384,7 +380,7 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
/* BPF poking in modules is not supported */
return -EINVAL;

- return __bpf_arch_text_poke(ip, t, old_addr, new_addr, true);
+ return __bpf_arch_text_poke(ip, t, old_addr, new_addr);
}

#define EMIT_LFENCE() EMIT3(0x0F, 0xAE, 0xE8)
@@ -558,24 +554,15 @@ static void bpf_tail_call_direct_fixup(struct bpf_prog *prog)
mutex_lock(&array->aux->poke_mutex);
target = array->ptrs[poke->tail_call.key];
if (target) {
- /* Plain memcpy is used when image is not live yet
- * and still not locked as read-only. Once poke
- * location is active (poke->tailcall_target_stable),
- * any parallel bpf_arch_text_poke() might occur
- * still on the read-write image until we finally
- * locked it as read-only. Both modifications on
- * the given image are under text_mutex to avoid
- * interference.
- */
ret = __bpf_arch_text_poke(poke->tailcall_target,
BPF_MOD_JUMP, NULL,
(u8 *)target->bpf_func +
- poke->adj_off, false);
+ poke->adj_off);
BUG_ON(ret < 0);
ret = __bpf_arch_text_poke(poke->tailcall_bypass,
BPF_MOD_JUMP,
(u8 *)poke->tailcall_target +
- X86_PATCH_SIZE, NULL, false);
+ X86_PATCH_SIZE, NULL);
BUG_ON(ret < 0);
}
WRITE_ONCE(poke->tailcall_target_stable, true);
@@ -866,7 +853,7 @@ static void emit_nops(u8 **pprog, int len)

#define INSN_SZ_DIFF (((addrs[i] - addrs[i - 1]) - (prog - temp)))

-static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
+static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image,
int oldproglen, struct jit_context *ctx, bool jmp_padding)
{
bool tail_call_reachable = bpf_prog->aux->tail_call_reachable;
@@ -893,8 +880,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
push_callee_regs(&prog, callee_regs_used);

ilen = prog - temp;
- if (image)
- memcpy(image + proglen, temp, ilen);
+ if (rw_image)
+ memcpy(rw_image + proglen, temp, ilen);
proglen += ilen;
addrs[0] = proglen;
prog = temp;
@@ -1323,6 +1310,9 @@ st: if (is_imm8(insn->off))
pr_err("extable->insn doesn't fit into 32-bit\n");
return -EFAULT;
}
+ /* switch ex to rw buffer for writes */
+ ex = (void *)rw_image + ((void *)ex - (void *)image);
+
ex->insn = delta;

ex->data = EX_TYPE_BPF;
@@ -1705,7 +1695,7 @@ st: if (is_imm8(insn->off))
pr_err("bpf_jit: fatal error\n");
return -EFAULT;
}
- memcpy(image + proglen, temp, ilen);
+ memcpy(rw_image + proglen, temp, ilen);
}
proglen += ilen;
addrs[i] = proglen;
@@ -2246,6 +2236,7 @@ int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs)
}

struct x64_jit_data {
+ struct bpf_binary_header *rw_header;
struct bpf_binary_header *header;
int *addrs;
u8 *image;
@@ -2258,6 +2249,7 @@ struct x64_jit_data {

struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
{
+ struct bpf_binary_header *rw_header = NULL;
struct bpf_binary_header *header = NULL;
struct bpf_prog *tmp, *orig_prog = prog;
struct x64_jit_data *jit_data;
@@ -2266,6 +2258,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
bool tmp_blinded = false;
bool extra_pass = false;
bool padding = false;
+ u8 *rw_image = NULL;
u8 *image = NULL;
int *addrs;
int pass;
@@ -2301,6 +2294,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
oldproglen = jit_data->proglen;
image = jit_data->image;
header = jit_data->header;
+ rw_header = jit_data->rw_header;
+ rw_image = (void *)rw_header + ((void *)image - (void *)header);
extra_pass = true;
padding = true;
goto skip_init_addrs;
@@ -2331,12 +2326,12 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
for (pass = 0; pass < MAX_PASSES || image; pass++) {
if (!padding && pass >= PADDING_PASSES)
padding = true;
- proglen = do_jit(prog, addrs, image, oldproglen, &ctx, padding);
+ proglen = do_jit(prog, addrs, image, rw_image, oldproglen, &ctx, padding);
if (proglen <= 0) {
out_image:
image = NULL;
if (header)
- bpf_jit_binary_free(header);
+ bpf_jit_binary_pack_free(header, rw_header);
prog = orig_prog;
goto out_addrs;
}
@@ -2360,8 +2355,9 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
sizeof(struct exception_table_entry);

/* allocate module memory for x86 insns and extable */
- header = bpf_jit_binary_alloc(roundup(proglen, align) + extable_size,
- &image, align, jit_fill_hole);
+ header = bpf_jit_binary_pack_alloc(roundup(proglen, align) + extable_size,
+ &image, align, &rw_header, &rw_image,
+ jit_fill_hole);
if (!header) {
prog = orig_prog;
goto out_addrs;
@@ -2377,14 +2373,22 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)

if (image) {
if (!prog->is_func || extra_pass) {
+ /*
+ * bpf_jit_binary_pack_finalize fails in two scenarios:
+ * 1) header is not pointing to proper module memory;
+ * 2) the arch doesn't support bpf_arch_text_copy().
+ *
+ * Both cases are serious bugs that we should not continue.
+ */
+ BUG_ON(bpf_jit_binary_pack_finalize(prog, header, rw_header));
bpf_tail_call_direct_fixup(prog);
- bpf_jit_binary_lock_ro(header);
} else {
jit_data->addrs = addrs;
jit_data->ctx = ctx;
jit_data->proglen = proglen;
jit_data->image = image;
jit_data->header = header;
+ jit_data->rw_header = rw_header;
}
prog->bpf_func = (void *)image;
prog->jited = 1;
--
2.30.2