Sargun Dhillon 96ae522795 bpf: Add bpf_probe_write_user BPF helper to be called in tracers ... This allows user memory to be written to during the course of a kprobe. It shouldn't be used to implement any kind of security mechanism because of TOC-TOU attacks, but rather to debug, divert, and manipulate execution of semi-cooperative processes. Although it uses probe_kernel_write, we limit the address space the probe can write into by checking the space with access_ok. We do this as opposed to calling copy_to_user directly, in order to avoid sleeping. In addition we ensure the threads's current fs / segment is USER_DS and the thread isn't exiting nor a kernel thread. Given this feature is meant for experiments, and it has a risk of crashing the system, and running programs, we print a warning on when a proglet that attempts to use this helper is installed, along with the pid and process name. Signed-off-by: Sargun Dhillon <sargun@sargun.me> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-07-25 18:07:48 -07:00
..
bpf	bpf: enable direct packet data write for xdp progs	2016-07-19 21:46:33 -07:00
configs	…
debug	…
events	bpf, events: fix offset in skb copy handler	2016-07-25 10:34:11 -07:00
gcov	gcov: add support for gcc version >= 6	2016-07-15 14:54:27 +09:00
irq	irqchip updates for 4.7-rc1:	2016-06-03 15:05:51 +02:00
livepatch	Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus	2016-05-17 12:06:35 +02:00
locking	locking: avoid passing around 'thread_info' in mutex debugging code	2016-06-23 12:11:17 -07:00
power	oom, suspend: fix oom_reaper vs. oom_killer_disable race	2016-06-24 17:23:52 -07:00
printk	printk/nmi: flush NMI messages on the system panic	2016-05-20 17:58:30 -07:00
rcu	debugobjects: insulate non-fixup logic related to static obj from fixup callbacks	2016-05-19 19:12:14 -07:00
sched	sched/core: Correct off by one bug in load migration calculation	2016-07-13 14:58:20 +02:00
time	posix_cpu_timer: Exit early when process has been reaped	2016-07-11 17:20:12 +02:00
trace	bpf: Add bpf_probe_write_user BPF helper to be called in tracers	2016-07-25 18:07:48 -07:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	…
Kconfig.preempt	…
Makefile	ELF/MIPS build fix	2016-05-23 17:04:14 -07:00
acct.c	…
async.c	…
audit.c	Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit	2016-06-29 15:18:47 -07:00
audit.h	audit: move audit_get_tty to reduce scope and kabi changes	2016-06-28 15:48:48 -04:00
audit_fsnotify.c	…
audit_tree.c	audit: cleanup prune_tree_thread	2016-04-04 09:46:47 -04:00
audit_watch.c	don't bother with ->d_inode->i_sb - it's always equal to ->d_sb	2016-04-10 17:11:51 -04:00
auditfilter.c	…
auditsc.c	Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit	2016-06-29 15:18:47 -07:00
backtracetest.c	…
bounds.c	…
capability.c	…
cgroup.c	cgroup: Add cgroup_get_from_fd	2016-07-01 16:30:38 -04:00
cgroup_freezer.c	…
cgroup_pids.c	…
compat.c	…
configs.c	…
context_tracking.c	…
cpu.c	cpu/hotplug: Keep enough storage space if SMP=n to avoid array out of bounds scribble	2016-07-13 09:29:39 +02:00
cpu_pm.c	…
cpuset.c	cpuset: use static key better and convert to new API	2016-05-19 19:12:14 -07:00
crash_dump.c	…
cred.c	…
delayacct.c	…
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	wait: allow sys_waitid() to accept __WNOTHREAD/__WCLONE/__WALL	2016-05-23 17:04:14 -07:00
extable.c	…
fork.c	Fix build break in fork.c when THREAD_SIZE < PAGE_SIZE	2016-06-25 06:01:28 -07:00
freezer.c	…
futex.c	futex: Calculate the futex key based on a tail page for file-based futexes	2016-06-08 19:23:54 +02:00
futex_compat.c	…
groups.c	…
hung_task.c	kernel/hung_task.c: use timeout diff when timeout is updated	2016-03-22 15:36:02 -07:00
irq_work.c	…
jump_label.c	locking/static_key: Fix concurrent static_key_slow_inc()	2016-06-24 08:23:16 +02:00
kallsyms.c	kallsyms: add support for relative offsets in kallsyms address table	2016-03-15 16:55:16 -07:00
kcmp.c	…
kcov.c	kernel/kcov: unproxify debugfs file's fops	2016-06-15 04:56:35 -07:00
kexec.c	s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()	2016-05-23 17:04:14 -07:00
kexec_core.c	s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()	2016-05-23 17:04:14 -07:00
kexec_file.c	kexec: introduce a protection mechanism for the crashkernel reserved memory	2016-05-23 17:04:14 -07:00
kexec_internal.h	…
kmod.c	…
kprobes.c	…
ksysfs.c	…
kthread.c	…
latencytop.c	…
membarrier.c	…
memremap.c	memremap: add arch specific hook for MEMREMAP_WB mappings	2016-04-04 10:26:41 +02:00
module-internal.h	…
module.c	module: preserve Elf information for livepatch modules	2016-04-01 15:00:10 +02:00
module_signing.c	KEYS: Move the point of trust determination to __key_link()	2016-04-11 22:43:43 +01:00
notifier.c	…
nsproxy.c	…
padata.c	kernel/padata.c: hide unused functions	2016-05-19 19:12:14 -07:00
panic.c	printk/nmi: flush NMI messages on the system panic	2016-05-20 17:58:30 -07:00
params.c	…
pid.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
pid_namespace.c	…
profile.c	profile: hide unused functions when !CONFIG_PROC_FS	2016-03-22 15:36:02 -07:00
ptrace.c	ptrace: change __ptrace_unlink() to clear ->ptrace under ->siglock	2016-03-22 15:36:02 -07:00
range.c	…
reboot.c	…
relay.c	kernel/relay.c: fix potential memory leak	2016-06-09 14:23:11 -07:00
resource.c	/proc/iomem: only expose physical resource addresses to privileged users	2016-04-14 12:56:09 -07:00
seccomp.c	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2016-05-19 10:02:26 -07:00
signal.c	kernel/signal.c: convert printk(KERN_<LEVEL> ...) to pr_<level>(...)	2016-05-23 17:04:14 -07:00
smp.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-15 13:50:29 -07:00
smpboot.c	cpu/hotplug: Unpark smpboot threads from the state machine	2016-03-01 20:36:56 +01:00
smpboot.h	cpu/hotplug: Create hotplug threads	2016-03-01 20:36:56 +01:00
softirq.c	arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections	2016-03-25 16:37:42 -07:00
stacktrace.c	…
stop_machine.c	…
sys.c	prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable	2016-05-23 17:04:14 -07:00
sys_ni.c	…
sysctl.c	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-05-25 17:05:40 -07:00
sysctl_binary.c	kernel/sysctl_binary.c: use generic UUID library	2016-05-20 17:58:30 -07:00
task_work.c	…
taskstats.c	taskstats: use the libnl API to align nlattr on 64-bit	2016-04-23 20:13:25 -04:00
test_kprobes.c	…
torture.c	rcutorture: Dump trace buffer upon shutdown	2016-04-21 13:47:04 -07:00
tracepoint.c	kernel/...: convert pr_warning to pr_warn	2016-03-22 15:36:02 -07:00
tsacct.c	time, acct: Drop irq save & restore from __acct_update_integrals()	2016-02-29 09:53:09 +01:00
uid16.c	…
up.c	…
user-return-notifier.c	…
user.c	…
user_namespace.c	…
utsname.c	…
utsname_sysctl.c	…
watchdog.c	watchdog: don't run proc_watchdog_update if new value is same as old	2016-03-17 15:09:34 -07:00
workqueue.c	workqueue: Fix setting affinity of unbound worker threads	2016-06-16 15:37:05 -04:00
workqueue_internal.h	sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()	2016-03-02 10:28:47 -05:00