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00f146413c
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Roberto Sassu 00f146413c btf: Export bpf_dynptr definition 
eBPF dynamic pointers is a new feature recently added to upstream. It binds
together a pointer to a memory area and its size. The internal kernel
structure bpf_dynptr_kern is not accessible by eBPF programs in user space.
They instead see bpf_dynptr, which is then translated to the internal
kernel structure by the eBPF verifier.

The problem is that it is not possible to include at the same time the uapi
include linux/bpf.h and the vmlinux BTF vmlinux.h, as they both contain the
definition of some structures/enums. The compiler complains saying that the
structures/enums are redefined.

As bpf_dynptr is defined in the uapi include linux/bpf.h, this makes it
impossible to include vmlinux.h. However, in some cases, e.g. when using
kfuncs, vmlinux.h has to be included. The only option until now was to
include vmlinux.h and add the definition of bpf_dynptr directly in the eBPF
program source code from linux/bpf.h.

Solve the problem by using the same approach as for bpf_timer (which also
follows the same scheme with the _kern suffix for the internal kernel
structure).

Add the following line in one of the dynamic pointer helpers,
bpf_dynptr_from_mem():

BTF_TYPE_EMIT(struct bpf_dynptr);

Cc: stable@vger.kernel.org
Cc: Joanne Koong <joannelkoong@gmail.com>
Fixes: 97e03f5210 ("bpf: Add verifier support for dynptrs")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Acked-by: Yonghong Song <yhs@fb.com>
Tested-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/20220920075951.929132-3-roberto.sassu@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2022-09-21 17:32:48 -07:00
..
bpf btf: Export bpf_dynptr definition 2022-09-21 17:32:48 -07:00
cgroup Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-09-06 23:21:18 +02:00
configs xen: branch for v6.0-rc1b 2022-08-14 09:28:54 -07:00
debug Modules updates for v5.19-rc1 2022-05-26 17:13:43 -07:00
dma remoteproc updates for v5.20 2022-08-08 15:16:29 -07:00
entry context_tracking: Take NMI eqs entrypoints over RCU 2022-07-05 13:32:59 -07:00
events Misc fixes to kprobes and the faddr2line script, plus a cleanup. 2022-08-06 17:28:12 -07:00
futex drm for 5.19-rc1 2022-05-25 16:18:27 -07:00
gcov gcov: Remove compiler version check 2021-12-02 17:25:21 +09:00
irq irqchip/genirq updates for 5.20: 2022-07-28 12:36:35 +02:00
kcsan kcsan: test: Add a .kunitconfig to run KCSAN tests 2022-07-22 09:22:59 -06:00
livepatch Livepatching changes for 5.19 2022-06-02 08:55:01 -07:00
locking RCU pull request for v5.20 (or whatever) 2022-08-02 19:12:45 -07:00
module module: kunit: Load .kunit_test_suites section when CONFIG_KUNIT=m 2022-08-15 13:51:07 -06:00
power Char / Misc driver changes for 6.0-rc1 2022-08-04 11:05:48 -07:00
printk printk: do not wait for consoles when suspended 2022-07-15 10:52:11 +02:00
rcu - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
sched wait_on_bit: add an acquire memory barrier 2022-08-26 09:30:25 -07:00
time time: Correct the prototype of ns_to_kernel_old_timeval and ns_to_timespec64 2022-08-09 20:02:13 +02:00
trace ftrace: Add HAVE_DYNAMIC_FTRACE_NO_PATCHABLE 2022-09-16 22:16:48 +02:00
.gitignore
acct.c kernel/acct: move acct sysctls to its own file 2022-04-06 13:43:44 -07:00
async.c Revert "module, async: async_synchronize_full() on module init iff async is used" 2022-02-03 11:20:34 -08:00
audit_fsnotify.c audit: fix potential double free on error path from fsnotify_add_inode_mark 2022-08-22 18:50:06 -04:00
audit_tree.c audit: use fsnotify group lock helpers 2022-04-25 14:37:28 +02:00
audit_watch.c fsnotify: pass flags argument to fsnotify_alloc_group() 2022-04-25 14:37:12 +02:00
audit.c audit: make is_audit_feature_set() static 2022-06-13 14:08:57 -04:00
audit.h audit: log AUDIT_TIME_* records only from rules 2022-02-22 13:51:40 -05:00
auditfilter.c audit/stable-5.17 PR 20220110 2022-01-11 13:08:21 -08:00
auditsc.c audit: move audit_return_fixup before the filters 2022-08-25 17:25:08 -04:00
backtracetest.c
bounds.c
capability.c xfs: don't generate selinux audit messages for capability testing 2022-03-09 10:32:06 -08:00
cfi.c context_tracking: Take IRQ eqs entrypoints over RCU 2022-07-05 13:32:59 -07:00
compat.c arch: remove compat_alloc_user_space 2021-09-08 15:32:35 -07:00
configs.c
context_tracking.c MAINTAINERS: Add Paul as context tracking maintainer 2022-07-05 13:33:00 -07:00
cpu_pm.c context_tracking: Take IRQ eqs entrypoints over RCU 2022-07-05 13:32:59 -07:00
cpu.c Intel Trust Domain Extensions 2022-05-23 17:51:12 -07:00
crash_core.c vmcoreinfo: add kallsyms_num_syms symbol 2022-08-28 14:02:44 -07:00
crash_dump.c
cred.c x86: Mark __invalid_creds() __noreturn 2022-03-15 10:32:44 +01:00
delayacct.c delayacct: track delays from write-protect copy 2022-06-01 15:55:25 -07:00
dma.c
exec_domain.c
exit.c exit: Fix typo in comment: s/sub-theads/sub-threads 2022-08-03 10:44:54 +02:00
extable.c context_tracking: Take NMI eqs entrypoints over RCU 2022-07-05 13:32:59 -07:00
fail_function.c
fork.c Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
freezer.c
gen_kheaders.sh kheaders: Have cpio unconditionally replace files 2022-05-08 03:16:59 +09:00
groups.c security: Add LSM hook to setgroups() syscall 2022-07-15 18:21:49 +00:00
hung_task.c kernel/hung_task: fix address space of proc_dohung_task_timeout_secs 2022-07-29 18:12:35 -07:00
iomem.c
irq_work.c irq_work: use kasan_record_aux_stack_noalloc() record callstack 2022-04-15 14:49:55 -07:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kallsyms_internal.h kallsyms: move declarations to internal header 2022-07-17 17:31:39 -07:00
kallsyms.c Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels" 2022-03-31 10:36:55 +02:00
kcov.c kcov: update pos before writing pc in trace function 2022-05-25 13:05:42 -07:00
kexec_core.c kexec: drop weak attribute from functions 2022-07-15 12:21:16 -04:00
kexec_elf.c
kexec_file.c Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
kexec_internal.h
kexec.c kexec: avoid compat_alloc_user_space 2021-09-08 15:32:34 -07:00
kheaders.c
kmod.c
kprobes.c kprobes: don't call disarm_kprobe() for disabled kprobes 2022-08-20 15:17:46 -07:00
ksysfs.c kernel/ksysfs.c: use helper macro __ATTR_RW 2022-03-23 19:00:33 -07:00
kthread.c kthread: make it clear that kthread_create_on_node() might be terminated by any fatal signal 2022-06-16 19:11:30 -07:00
latencytop.c latencytop: move sysctl to its own file 2022-04-21 11:40:59 -07:00
Makefile kernel: remove platform_has() infrastructure 2022-08-01 07:42:56 +02:00
module_signature.c
notifier.c notifier: Add blocking/atomic_notifier_chain_register_unique_prio() 2022-05-19 19:30:30 +02:00
nsproxy.c fs/exec: allow to unshare a time namespace on vfork+exec 2022-06-15 07:58:04 -07:00
padata.c padata: replace cpumask_weight with cpumask_empty in padata.c 2022-01-31 11:21:46 +11:00
panic.c linux-kselftest-kunit-5.20-rc1 2022-08-02 19:34:45 -07:00
params.c kobject: remove kset from struct kset_uevent_ops callbacks 2021-12-28 11:26:18 +01:00
pid_namespace.c kernel: pid_namespace: use NULL instead of using plain integer as pointer 2022-04-29 14:38:00 -07:00
pid.c pid: add pidfd_get_task() helper 2021-10-14 13:29:18 +02:00
profile.c profile: setup_profiling_timer() is moslty not implemented 2022-07-29 18:12:36 -07:00
ptrace.c ptrace: fix clearing of JOBCTL_TRACED in ptrace_unfreeze_traced() 2022-07-09 11:06:19 -07:00
range.c
reboot.c Merge branch 'rework/kthreads' into for-linus 2022-06-23 19:11:28 +02:00
regset.c
relay.c relay: remove redundant assignment to pointer buf 2022-05-12 20:38:37 -07:00
resource_kunit.c
resource.c resource: Introduce alloc_free_mem_region() 2022-07-21 17:19:25 -07:00
rseq.c rseq: Kill process when unknown flags are encountered in ABI structures 2022-08-01 15:21:42 +02:00
scftorture.c scftorture: Fix distribution of short handler delays 2022-04-11 17:07:29 -07:00
scs.c kasan, vmalloc: only tag normal vmalloc allocations 2022-03-24 19:06:48 -07:00
seccomp.c seccomp: Add wait_killable semantic to seccomp user notifier 2022-05-03 14:11:58 -07:00
signal.c signal handling: don't use BUG_ON() for debugging 2022-07-07 09:53:43 -07:00
smp.c locking/csd_lock: Change csdlock_debug from early_param to __setup 2022-07-19 11:40:00 -07:00
smpboot.c cpu/hotplug: Allow the CPU in CPU_UP_PREPARE state to be brought up again. 2022-04-12 14:13:01 +02:00
smpboot.h
softirq.c context_tracking: Take IRQ eqs entrypoints over RCU 2022-07-05 13:32:59 -07:00
stackleak.c stackleak: add on/off stack variants 2022-05-08 01:33:09 -07:00
stacktrace.c uaccess: remove CONFIG_SET_FS 2022-02-25 09:36:06 +01:00
static_call_inline.c static_call: Don't make __static_call_return0 static 2022-04-05 09:59:38 +02:00
static_call.c static_call: Don't make __static_call_return0 static 2022-04-05 09:59:38 +02:00
stop_machine.c Scheduler changes in this cycle were: 2022-05-24 11:11:13 -07:00
sys_ni.c kernel/sys_ni: add compat entry for fadvise64_64 2022-08-20 15:17:45 -07:00
sys.c arm64/sme: Implement vector length configuration prctl()s 2022-04-22 18:50:54 +01:00
sysctl-test.c
sysctl.c kernel/sysctl.c: Remove trailing white space 2022-08-08 09:01:36 -07:00
task_work.c task_work: allow TWA_SIGNAL without a rescheduling IPI 2022-04-30 08:39:32 -06:00
taskstats.c genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
torture.c torture: Wake up kthreads after storing task_struct pointer 2022-02-01 17:24:39 -08:00
tracepoint.c
tsacct.c taskstats: version 12 with thread group and exe info 2022-04-29 14:38:03 -07:00
ucount.c ucounts: Handle wrapping in is_ucounts_overlimit 2022-02-17 09:11:57 -06:00
uid16.c
uid16.h
umh.c kthread: Don't allocate kthread_struct for init and umh 2022-05-06 14:49:44 -05:00
up.c
user_namespace.c ucounts: Fix systemd LimitNPROC with private users regression 2022-02-25 10:40:14 -06:00
user-return-notifier.c
user.c fs/epoll: use a per-cpu counter for user's watches count 2021-09-08 11:50:27 -07:00
usermode_driver.c blob_to_mnt(): kern_unmount() is needed to undo kern_mount() 2022-05-19 23:25:47 -04:00
utsname_sysctl.c
utsname.c
watch_queue.c This was a moderately busy cycle for documentation, but nothing all that 2022-08-02 19:24:24 -07:00
watchdog_hld.c Revert "printk: add functions to prefer direct printing" 2022-06-23 18:41:40 +02:00
watchdog.c powerpc updates for 6.0 2022-08-06 16:38:17 -07:00
workqueue_internal.h
workqueue.c drm for 5.20/6.0 2022-08-03 19:52:08 -07:00