Martin KaFai Lau 82e9697250 bpf: btf: Avoid WARN_ON when CONFIG_REFCOUNT_FULL=y ... If CONFIG_REFCOUNT_FULL=y, refcount_inc() WARN when refcount is 0. When creating a new btf, the initial btf->refcnt is 0 and triggered the following: [ 34.855452] refcount_t: increment on 0; use-after-free. [ 34.856252] WARNING: CPU: 6 PID: 1857 at lib/refcount.c:153 refcount_inc+0x26/0x30 .... [ 34.868809] Call Trace: [ 34.869168] btf_new_fd+0x1af6/0x24d0 [ 34.869645] ? btf_type_seq_show+0x200/0x200 [ 34.870212] ? lock_acquire+0x3b0/0x3b0 [ 34.870726] ? security_capable+0x54/0x90 [ 34.871247] __x64_sys_bpf+0x1b2/0x310 [ 34.871761] ? __ia32_sys_bpf+0x310/0x310 [ 34.872285] ? bad_area_access_error+0x310/0x310 [ 34.872894] do_syscall_64+0x95/0x3f0 This patch uses refcount_set() instead. Reported-by: Yonghong Song <yhs@fb.com> Tested-by: Yonghong Song <yhs@fb.com> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>		2018-05-09 17:25:13 +02:00
..
bpf	bpf: btf: Avoid WARN_ON when CONFIG_REFCOUNT_FULL=y	2018-05-09 17:25:13 +02:00
cgroup	Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2018-04-03 18:00:13 -07:00
configs
debug	* Fix 2032 time access issues and new compiler warnings	2018-04-12 10:21:19 -07:00
events	Various fixes in tracing:	2018-05-02 17:38:37 -10:00
gcov
irq	genirq/affinity: Spread irq vectors among present CPUs as far as possible	2018-04-06 12:19:51 +02:00
livepatch	livepatch: Allow to call a custom callback when freeing shadow variables	2018-04-17 13:42:48 +02:00
locking	locking/rwsem: Add DEBUG_RWSEMS to look for lock/unlock mismatches	2018-03-31 07:30:50 +02:00
power	PM / QoS: mark expected switch fall-throughs	2018-04-09 13:49:40 +02:00
printk	New features:	2018-04-10 11:27:30 -07:00
rcu
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-15 12:43:30 -07:00
time	Revert: Unify CLOCK_MONOTONIC and CLOCK_BOOTTIME	2018-04-26 14:53:32 +02:00
trace	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2018-05-07 23:35:08 -04:00
.gitignore
acct.c
async.c
audit.c	audit/stable-4.17 PR 20180403	2018-04-06 15:01:25 -07:00
audit.h
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
compat.c	mm: add kernel_move_pages() helper, move compat syscall to mm/migrate.c	2018-04-02 20:15:32 +02:00
configs.c
context_tracking.c
cpu.c
cpu_pm.c
crash_core.c	kexec: export PG_swapbacked to VMCOREINFO	2018-04-13 17:10:27 -07:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	kernel: use kernel_wait4() instead of sys_wait4()	2018-04-02 20:14:51 +02:00
extable.c
fail_function.c
fork.c	fork: unconditionally clear stack on fork	2018-04-20 17:18:35 -07:00
freezer.c
futex.c
futex_compat.c
groups.c
hung_task.c
irq_work.c
jump_label.c	jump_label: Disable jump labels in __exit code	2018-03-20 08:57:17 +01:00
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c	kexec: call do_kexec_load() in compat syscall directly	2018-04-02 20:15:01 +02:00
kexec_core.c
kexec_file.c	kernel/kexec_file.c: allow archs to set purgatory load address	2018-04-13 17:10:28 -07:00
kexec_internal.h
kmod.c
kprobes.c	kprobes: Fix random address output of blacklist file	2018-04-25 10:27:56 -04:00
ksysfs.c
kthread.c
latencytop.c
Makefile
memremap.c
module-internal.h
module.c	module: Fix display of wrong module .text address	2018-04-18 22:59:46 +02:00
module_signing.c
notifier.c
nsproxy.c
padata.c
panic.c	taint: add taint for randstruct	2018-04-11 10:28:35 -07:00
params.c	kernel/params.c: downgrade warning for unsafe parameters	2018-04-11 10:28:37 -07:00
pid.c	xarray: add the xa_lock to the radix_tree_root	2018-04-11 10:28:39 -07:00
pid_namespace.c	Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2018-04-03 19:15:32 -07:00
profile.c
ptrace.c
range.c
reboot.c
relay.c
resource.c	resource: fix integer overflow at reallocation	2018-04-13 17:10:27 -07:00
seccomp.c
signal.c	Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2018-04-07 11:11:41 -07:00
smp.c
smpboot.c
smpboot.h
softirq.c
stacktrace.c
stop_machine.c
sys.c	kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()	2018-04-02 20:16:06 +02:00
sys_ni.c	syscalls/core: Prepare CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y for compat syscalls	2018-04-05 16:59:38 +02:00
sysctl.c	kernel/sysctl.c: add kdoc comments to do_proc_do{u}intvec_minmax_conv_param	2018-04-11 10:28:38 -07:00
sysctl_binary.c	staging: irda: remove remaining remants of irda code removal	2018-04-16 11:26:49 +02:00
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Do not warn on ENOMEM	2018-04-30 12:09:56 -04:00
tsacct.c
ucount.c	headers: untangle kmemleak.h from mm.h	2018-04-05 21:36:27 -07:00
uid16.c	fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers	2018-04-02 20:15:59 +02:00
uid16.h	kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c	2018-04-02 20:15:30 +02:00
umh.c	kernel: use kernel_wait4() instead of sys_wait4()	2018-04-02 20:14:51 +02:00
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c	uts: create "struct uts_namespace" from kmem_cache	2018-04-11 10:28:35 -07:00
utsname_sysctl.c
watchdog.c
watchdog_hld.c
workqueue.c	Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2018-04-03 18:00:13 -07:00
workqueue_internal.h