Yonghong Song e9eeec58c9 bpf: Fix a bug when getting subprog 0 jited image in check_attach_btf_id ... For jited bpf program, if the subprogram count is 1, i.e., there is no callees in the program, prog->aux->func will be NULL and prog->bpf_func points to image address of the program. If there is more than one subprogram, prog->aux->func is populated, and subprogram 0 can be accessed through either prog->bpf_func or prog->aux->func[0]. Other subprograms should be accessed through prog->aux->func[subprog_id]. This patch fixed a bug in check_attach_btf_id(), where prog->aux->func[subprog_id] is used to access any subprogram which caused a segfault like below: [79162.619208] BUG: kernel NULL pointer dereference, address: 0000000000000000 ...... [79162.634255] Call Trace: [79162.634974] ? _cond_resched+0x15/0x30 [79162.635686] ? kmem_cache_alloc_trace+0x162/0x220 [79162.636398] ? selinux_bpf_prog_alloc+0x1f/0x60 [79162.637111] bpf_prog_load+0x3de/0x690 [79162.637809] __do_sys_bpf+0x105/0x1740 [79162.638488] do_syscall_64+0x5b/0x180 [79162.639147] entry_SYSCALL_64_after_hwframe+0x44/0xa9 ...... Fixes: 5b92a28aae ("bpf: Support attaching tracing BPF program to other BPF programs") Reported-by: Eelco Chaudron <echaudro@redhat.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191205010606.177774-1-yhs@fb.com		2019-12-04 21:20:07 -08:00
..
bpf	bpf: Fix a bug when getting subprog 0 jited image in check_attach_btf_id	2019-12-04 21:20:07 -08:00
cgroup	Merge branch 'for-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2019-11-25 19:23:46 -08:00
configs
debug	kdb: Tweak escape handling for vi users	2019-10-28 12:08:29 +00:00
dma	dma-mapping updates for 5.5-rc1	2019-11-28 11:16:43 -08:00
events	mm/mmap.c: use IS_ERR_VALUE to check return value of get_unmapped_area	2019-12-01 06:29:19 -08:00
gcov	um: Enable CONFIG_CONSTRUCTORS	2019-09-15 21:37:13 +02:00
irq	irq/irqdomain: Update __irq_domain_alloc_fwnode() function documentation	2019-11-05 00:48:26 +01:00
livepatch	New tracing features:	2019-11-27 11:42:01 -08:00
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-11-26 16:02:40 -08:00
power	y2038: syscall implementation cleanups	2019-12-01 14:00:59 -08:00
printk	locking/lockdep: Remove unused @nested argument from lock_release()	2019-10-09 12:46:10 +02:00
rcu	Merge branches 'doc.2019.10.29a', 'fixes.2019.10.30a', 'nohz.2019.10.28a', 'replace.2019.10.30a', 'torture.2019.10.05a' and 'lkmm.2019.10.05a' into HEAD	2019-10-30 08:47:13 -07:00
sched	Pipework for general notification queue	2019-11-30 14:12:13 -08:00
time	y2038: syscall implementation cleanups	2019-12-01 14:00:59 -08:00
trace	New tracing features:	2019-11-27 11:42:01 -08:00
.gitignore
acct.c
async.c
audit_fsnotify.c
audit_tree.c
audit_watch.c	audit_get_nd(): don't unlock parent too early	2019-11-10 11:56:55 -05:00
audit.c	audit: remove redundant condition check in kauditd_thread()	2019-10-25 11:48:14 -04:00
audit.h
auditfilter.c
auditsc.c	Revert "bpf: Emit audit messages upon successful prog load and unload"	2019-11-23 09:56:02 -08:00
backtracetest.c
bounds.c
capability.c
compat.c	y2038: itimer: compat handling to itimer.c	2019-11-15 14:38:30 +01:00
configs.c
context_tracking.c	context_tracking: Rename context_tracking_is_enabled() => context_tracking_enabled()	2019-10-29 10:01:12 +01:00
cpu_pm.c
cpu.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-11-26 16:02:40 -08:00
crash_core.c
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c	kernel/elfcore.c: include proper prototypes	2019-09-25 17:51:39 -07:00
exec_domain.c
exit.c	Pipework for general notification queue	2019-11-30 14:12:13 -08:00
extable.c	bpf: Add support for BTF pointers to x86 JIT	2019-10-17 16:44:36 +02:00
fail_function.c
fork.c	fork: support VMAP_STACK with KASAN_VMALLOC	2019-12-01 12:59:05 -08:00
freezer.c	Revert "libata, freezer: avoid block device removal while system is frozen"	2019-10-06 09:11:37 -06:00
futex.c	futex: Prevent exit livelock	2019-11-20 09:40:38 +01:00
gen_kheaders.sh	kheaders: substituting --sort in archive creation	2019-10-17 09:08:19 +09:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c	jump_label: Don't warn on __exit jump entries	2019-08-29 15:10:10 +01:00
kallsyms.c	kallsyms: Don't let kallsyms_lookup_size_offset() fail on retrieving the first symbol	2019-08-27 16:19:56 +01:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt	sched/Kconfig: Fix spelling mistake in user-visible help text	2019-11-12 11:35:32 +01:00
kcov.c
kexec_core.c	kexec: bail out upon SIGKILL when allocating memory.	2019-09-25 17:51:40 -07:00
kexec_elf.c	kexec_elf: support 32 bit ELF files	2019-09-06 23:58:44 +02:00
kexec_file.c	kexec: Fix pointer-to-int-cast warnings	2019-11-01 21:42:58 +01:00
kexec_internal.h
kexec.c	kexec_load: Disable at runtime if the kernel is locked down	2019-08-19 21:54:15 -07:00
kheaders.c
kmod.c
kprobes.c	Tracing updates:	2019-09-20 11:19:48 -07:00
ksysfs.c
kthread.c	kthread: make __kthread_queue_delayed_work static	2019-10-16 09:20:58 -07:00
latencytop.c
Makefile	kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()	2019-09-30 17:35:01 -06:00
module_signature.c
module_signing.c
module-internal.h
module.c	New tracing features:	2019-11-27 11:42:01 -08:00
notifier.c
nsproxy.c
padata.c	padata: remove cpu_index from the parallel_queue	2019-09-13 21:15:41 +10:00
panic.c	locking/refcount: Remove unused 'refcount_error_report()' function	2019-11-25 09:15:42 +01:00
params.c	lockdown: Lock down module params that specify hardware parameters (eg. ioport)	2019-08-19 21:54:16 -07:00
pid_namespace.c	fork: extend clone3() to support setting a PID	2019-11-15 23:49:22 +01:00
pid.c	fork: extend clone3() to support setting a PID	2019-11-15 23:49:22 +01:00
profile.c
ptrace.c
range.c
reboot.c
relay.c
resource.c	mm/memory_hotplug.c: use PFN_UP / PFN_DOWN in walk_system_ram_range()	2019-09-24 15:54:09 -07:00
rseq.c
seccomp.c	seccomp: add SECCOMP_USER_NOTIF_FLAG_CONTINUE	2019-10-10 14:45:51 -07:00
signal.c	cgroup: freezer: call cgroup_enter_frozen() with preemption disabled in ptrace_stop()	2019-10-11 08:39:57 -07:00
smp.c
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c	stacktrace: Get rid of unneeded '!!' pattern	2019-11-11 10:30:59 +01:00
stop_machine.c	Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu	2019-10-31 09:33:19 +01:00
sys_ni.c	y2038: allow disabling time32 system calls	2019-11-15 14:38:30 +01:00
sys.c	y2038: rusage: use __kernel_old_timeval	2019-11-15 14:38:29 +01:00
sysctl_binary.c	sysctl: Remove the sysctl system call	2019-11-26 13:03:56 -06:00
sysctl-test.c	kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()	2019-09-30 17:35:01 -06:00
sysctl.c	kernel: sysctl: make drop_caches write-only	2019-12-01 12:59:07 -08:00
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c
up.c
user_namespace.c
user-return-notifier.c
user.c
utsname_sysctl.c
utsname.c
watchdog_hld.c
watchdog.c
workqueue_internal.h
workqueue.c	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-11-26 15:42:43 -08:00