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

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Daniel Borkmann says:

====================
bpf 2021-12-08

We've added 12 non-merge commits during the last 22 day(s) which contain
a total of 29 files changed, 659 insertions(+), 80 deletions(-).

The main changes are:

1) Fix an off-by-two error in packet range markings and also add a batch of
   new tests for coverage of these corner cases, from Maxim Mikityanskiy.

2) Fix a compilation issue on MIPS JIT for R10000 CPUs, from Johan Almbladh.

3) Fix two functional regressions and a build warning related to BTF kfunc
   for modules, from Kumar Kartikeya Dwivedi.

4) Fix outdated code and docs regarding BPF's migrate_disable() use on non-
   PREEMPT_RT kernels, from Sebastian Andrzej Siewior.

5) Add missing includes in order to be able to detangle cgroup vs bpf header
   dependencies, from Jakub Kicinski.

6) Fix regression in BPF sockmap tests caused by missing detachment of progs
   from sockets when they are removed from the map, from John Fastabend.

7) Fix a missing "no previous prototype" warning in x86 JIT caused by BPF
   dispatcher, from Björn Töpel.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  bpf: Add selftests to cover packet access corner cases
  bpf: Fix the off-by-two error in range markings
  treewide: Add missing includes masked by cgroup -> bpf dependency
  tools/resolve_btfids: Skip unresolved symbol warning for empty BTF sets
  bpf: Fix bpf_check_mod_kfunc_call for built-in modules
  bpf: Make CONFIG_DEBUG_INFO_BTF depend upon CONFIG_BPF_SYSCALL
  mips, bpf: Fix reference to non-existing Kconfig symbol
  bpf: Make sure bpf_disable_instrumentation() is safe vs preemption.
  Documentation/locking/locktypes: Update migrate_disable() bits.
  bpf, sockmap: Re-evaluate proto ops when psock is removed from sockmap
  bpf, sockmap: Attach map progs to psock early for feature probes
  bpf, x86: Fix "no previous prototype" warning
====================

Link: https://lore.kernel.org/r/20211208155125.11826-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-12-08 16:06:44 -08:00
commit 6efcdadc15
29 changed files with 659 additions and 80 deletions
Download patch file Download diff file Expand all files Collapse all files

17
include/linux/bpf.h
View file

@ -732,6 +732,7 @@ int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr)
struct bpf_trampoline *bpf_trampoline_get(u64 key,
struct bpf_attach_target_info *tgt_info);
void bpf_trampoline_put(struct bpf_trampoline *tr);
int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
#define BPF_DISPATCHER_INIT(_name) { \
.mutex = __MUTEX_INITIALIZER(_name.mutex), \
.func = &_name##_func, \
@ -1352,28 +1353,16 @@ extern struct mutex bpf_stats_enabled_mutex;
* kprobes, tracepoints) to prevent deadlocks on map operations as any of
* these events can happen inside a region which holds a map bucket lock
* and can deadlock on it.
*
* Use the preemption safe inc/dec variants on RT because migrate disable
* is preemptible on RT and preemption in the middle of the RMW operation
* might lead to inconsistent state. Use the raw variants for non RT
* kernels as migrate_disable() maps to preempt_disable() so the slightly
* more expensive save operation can be avoided.
*/
static inline void bpf_disable_instrumentation(void)
{
migrate_disable();
if (IS_ENABLED(CONFIG_PREEMPT_RT))
this_cpu_inc(bpf_prog_active);
else
__this_cpu_inc(bpf_prog_active);
this_cpu_inc(bpf_prog_active);
}
static inline void bpf_enable_instrumentation(void)
{
if (IS_ENABLED(CONFIG_PREEMPT_RT))
this_cpu_dec(bpf_prog_active);
else
__this_cpu_dec(bpf_prog_active);
this_cpu_dec(bpf_prog_active);
migrate_enable();
}

14
include/linux/btf.h
View file

@ -245,7 +245,10 @@ struct kfunc_btf_id_set {
struct module *owner;
};
struct kfunc_btf_id_list;
struct kfunc_btf_id_list {
struct list_head list;
struct mutex mutex;
};
#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
void register_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
@ -254,6 +257,9 @@ void unregister_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
struct kfunc_btf_id_set *s);
bool bpf_check_mod_kfunc_call(struct kfunc_btf_id_list *klist, u32 kfunc_id,
struct module *owner);
extern struct kfunc_btf_id_list bpf_tcp_ca_kfunc_list;
extern struct kfunc_btf_id_list prog_test_kfunc_list;
#else
static inline void register_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
struct kfunc_btf_id_set *s)
@ -268,13 +274,13 @@ static inline bool bpf_check_mod_kfunc_call(struct kfunc_btf_id_list *klist,
{
return false;
}
static struct kfunc_btf_id_list bpf_tcp_ca_kfunc_list __maybe_unused;
static struct kfunc_btf_id_list prog_test_kfunc_list __maybe_unused;
#endif
#define DEFINE_KFUNC_BTF_ID_SET(set, name) \
struct kfunc_btf_id_set name = { LIST_HEAD_INIT(name.list), (set), \
THIS_MODULE }
extern struct kfunc_btf_id_list bpf_tcp_ca_kfunc_list;
extern struct kfunc_btf_id_list prog_test_kfunc_list;
#endif

1
include/linux/cacheinfo.h
View file

@ -3,7 +3,6 @@
#define _LINUX_CACHEINFO_H
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/smp.h>

1
include/linux/device/driver.h
View file

@ -18,6 +18,7 @@
#include <linux/klist.h>
#include <linux/pm.h>
#include <linux/device/bus.h>
#include <linux/module.h>
/**
* enum probe_type - device driver probe type to try

5
include/linux/filter.h
View file

@ -6,6 +6,7 @@
#define __LINUX_FILTER_H__
#include <linux/atomic.h>
#include <linux/bpf.h>
#include <linux/refcount.h>
#include <linux/compat.h>
#include <linux/skbuff.h>
@ -26,7 +27,6 @@
#include <asm/byteorder.h>
#include <uapi/linux/filter.h>
#include <uapi/linux/bpf.h>
struct sk_buff;
struct sock;
@ -640,9 +640,6 @@ static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void
* This uses migrate_disable/enable() explicitly to document that the
* invocation of a BPF program does not require reentrancy protection
* against a BPF program which is invoked from a preempting task.
*
* For non RT enabled kernels migrate_disable/enable() maps to
* preempt_disable/enable(), i.e. it disables also preemption.
*/
static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
const void *ctx)