From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
"Andrii Nakryiko" <andriin@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Song Liu" <songliubraving@fb.com>,
"Martin KaFai Lau" <kafai@fb.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David Miller" <davem@redhat.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>
Subject: [PATCH 03/14] bpf: Add struct bpf_ksym
Date: Sat, 8 Feb 2020 16:41:58 +0100 [thread overview]
Message-ID: <20200208154209.1797988-4-jolsa@kernel.org> (raw)
In-Reply-To: <20200208154209.1797988-1-jolsa@kernel.org>
Adding 'struct bpf_ksym' object that will carry the
kallsym information for bpf symbol. Adding the start
and end address to begin with. It will be used by
bpf_prog, bpf_trampoline, bpf_dispatcher.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
include/linux/bpf.h | 6 ++++++
kernel/bpf/core.c | 26 +++++++++++---------------
2 files changed, 17 insertions(+), 15 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 15c5f351f837..e39ded33fb0c 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -462,6 +462,11 @@ int arch_prepare_bpf_trampoline(void *image, void *image_end,
u64 notrace __bpf_prog_enter(void);
void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
+struct bpf_ksym {
+ unsigned long start;
+ unsigned long end;
+};
+
enum bpf_tramp_prog_type {
BPF_TRAMP_FENTRY,
BPF_TRAMP_FEXIT,
@@ -643,6 +648,7 @@ struct bpf_prog_aux {
u32 size_poke_tab;
struct latch_tree_node ksym_tnode;
struct list_head ksym_lnode;
+ struct bpf_ksym ksym;
const struct bpf_prog_ops *ops;
struct bpf_map **used_maps;
struct bpf_prog *prog;
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 973a20d49749..09b5939dcad3 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -524,17 +524,15 @@ int bpf_jit_harden __read_mostly;
long bpf_jit_limit __read_mostly;
static __always_inline void
-bpf_get_prog_addr_region(const struct bpf_prog *prog,
- unsigned long *symbol_start,
- unsigned long *symbol_end)
+bpf_get_prog_addr_region(const struct bpf_prog *prog)
{
const struct bpf_binary_header *hdr = bpf_jit_binary_hdr(prog);
unsigned long addr = (unsigned long)hdr;
WARN_ON_ONCE(!bpf_prog_ebpf_jited(prog));
- *symbol_start = addr;
- *symbol_end = addr + hdr->pages * PAGE_SIZE;
+ prog->aux->ksym.start = addr;
+ prog->aux->ksym.end = addr + hdr->pages * PAGE_SIZE;
}
void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
@@ -575,13 +573,10 @@ void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
static __always_inline unsigned long
bpf_get_prog_addr_start(struct latch_tree_node *n)
{
- unsigned long symbol_start, symbol_end;
const struct bpf_prog_aux *aux;
aux = container_of(n, struct bpf_prog_aux, ksym_tnode);
- bpf_get_prog_addr_region(aux->prog, &symbol_start, &symbol_end);
-
- return symbol_start;
+ return aux->ksym.start;
}
static __always_inline bool bpf_tree_less(struct latch_tree_node *a,
@@ -593,15 +588,13 @@ static __always_inline bool bpf_tree_less(struct latch_tree_node *a,
static __always_inline int bpf_tree_comp(void *key, struct latch_tree_node *n)
{
unsigned long val = (unsigned long)key;
- unsigned long symbol_start, symbol_end;
const struct bpf_prog_aux *aux;
aux = container_of(n, struct bpf_prog_aux, ksym_tnode);
- bpf_get_prog_addr_region(aux->prog, &symbol_start, &symbol_end);
- if (val < symbol_start)
+ if (val < aux->ksym.start)
return -1;
- if (val >= symbol_end)
+ if (val >= aux->ksym.end)
return 1;
return 0;
@@ -649,6 +642,8 @@ void bpf_prog_kallsyms_add(struct bpf_prog *fp)
!capable(CAP_SYS_ADMIN))
return;
+ bpf_get_prog_addr_region(fp);
+
spin_lock_bh(&bpf_lock);
bpf_prog_ksym_node_add(fp->aux);
spin_unlock_bh(&bpf_lock);
@@ -677,14 +672,15 @@ static struct bpf_prog *bpf_prog_kallsyms_find(unsigned long addr)
const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
unsigned long *off, char *sym)
{
- unsigned long symbol_start, symbol_end;
struct bpf_prog *prog;
char *ret = NULL;
rcu_read_lock();
prog = bpf_prog_kallsyms_find(addr);
if (prog) {
- bpf_get_prog_addr_region(prog, &symbol_start, &symbol_end);
+ unsigned long symbol_start = prog->aux->ksym.start;
+ unsigned long symbol_end = prog->aux->ksym.end;
+
bpf_get_prog_name(prog, sym);
ret = sym;
--
2.24.1
next prev parent reply other threads:[~2020-02-08 15:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 15:41 [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-02-08 15:41 ` [PATCH 01/14] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-02-08 15:41 ` [PATCH 02/14] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-02-08 15:41 ` Jiri Olsa [this message]
2020-02-08 15:41 ` [PATCH 04/14] bpf: Add name to struct bpf_ksym Jiri Olsa
2020-02-08 15:42 ` [PATCH 05/14] bpf: Add lnode list node " Jiri Olsa
2020-02-08 15:42 ` [PATCH 06/14] bpf: Add bpf_kallsyms_tree tree Jiri Olsa
2020-02-11 18:21 ` Andrii Nakryiko
2020-02-12 10:49 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 07/14] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-02-08 15:42 ` [PATCH 08/14] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 09/14] bpf: Add bpf_ksym_add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 10/14] bpf: Re-initialize lnode in bpf_ksym_del Jiri Olsa
2020-02-11 18:28 ` Andrii Nakryiko
2020-02-12 10:43 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 11/14] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-02-08 15:42 ` [PATCH 12/14] bpf: Add trampolines to kallsyms Jiri Olsa
2020-02-11 18:51 ` Andrii Nakryiko
2020-02-12 11:10 ` Jiri Olsa
2020-02-12 16:33 ` Andrii Nakryiko
2020-02-12 22:58 ` Jiri Olsa
2020-02-12 23:02 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 13/14] bpf: Add dispatchers " Jiri Olsa
2020-02-11 19:03 ` Andrii Nakryiko
2020-02-12 10:52 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 14/14] bpf: Sort bpf kallsyms symbols Jiri Olsa
2020-02-11 19:12 ` Andrii Nakryiko
2020-02-10 15:51 ` [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Björn Töpel
2020-02-10 16:17 ` Jiri Olsa
2020-02-11 19:32 ` Arnaldo Carvalho de Melo
2020-02-12 11:13 ` Jiri Olsa
2020-02-12 13:31 ` Arnaldo Carvalho de Melo
2020-02-12 22:40 ` Jiri Olsa
2020-02-13 16:23 ` Jiri Olsa
2020-02-11 19:13 ` Arnaldo Carvalho de Melo
2020-02-12 10:46 ` Jiri Olsa
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