Joanne Koong 97e03f5210 bpf: Add verifier support for dynptrs ... This patch adds the bulk of the verifier work for supporting dynamic pointers (dynptrs) in bpf. A bpf_dynptr is opaque to the bpf program. It is a 16-byte structure defined internally as: struct bpf_dynptr_kern { void *data; u32 size; u32 offset; } __aligned(8); The upper 8 bits of *size* is reserved (it contains extra metadata about read-only status and dynptr type). Consequently, a dynptr only supports memory less than 16 MB. There are different types of dynptrs (eg malloc, ringbuf, ...). In this patchset, the most basic one, dynptrs to a bpf program's local memory, is added. For now only local memory that is of reg type PTR_TO_MAP_VALUE is supported. In the verifier, dynptr state information will be tracked in stack slots. When the program passes in an uninitialized dynptr (ARG_PTR_TO_DYNPTR | MEM_UNINIT), the stack slots corresponding to the frame pointer where the dynptr resides at are marked STACK_DYNPTR. For helper functions that take in initialized dynptrs (eg bpf_dynptr_read + bpf_dynptr_write which are added later in this patchset), the verifier enforces that the dynptr has been initialized properly by checking that their corresponding stack slots have been marked as STACK_DYNPTR. The 6th patch in this patchset adds test cases that the verifier should successfully reject, such as for example attempting to use a dynptr after doing a direct write into it inside the bpf program. Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: David Vernet <void@manifault.com> Link: https://lore.kernel.org/bpf/20220523210712.3641569-2-joannelkoong@gmail.com		2022-05-23 14:30:17 -07:00
..
bpf	bpf: Add verifier support for dynptrs	2022-05-23 14:30:17 -07:00
cgroup	Driver core changes for 5.18-rc1	2022-03-28 12:41:28 -07:00
configs	Char/Misc and other driver updates for 5.18-rc1	2022-03-28 12:27:35 -07:00
debug	kdb: Fix the putarea helper function	2022-03-24 16:39:47 +00:00
dma	dma-direct: avoid redundant memory sync for swiotlb	2022-04-14 06:30:39 +02:00
entry	entry: Fix compile error in dynamic_irqentry_exit_cond_resched()	2022-04-05 09:59:36 +02:00
events	perf/core: Always set cpuctx cgrp when enable cgroup event	2022-04-05 09:59:45 +02:00
futex	mm/truncate: Inline invalidate_complete_page() into its one caller	2022-03-21 12:59:01 -04:00
gcov
irq	genirq/affinity: Consider that CPUs on nodes can be unbalanced	2022-04-11 09:58:03 +02:00
kcsan	KCSAN updates for v5.17	2022-01-11 09:51:26 -08:00
livepatch	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
locking	Changes in this cycle were:	2022-03-22 13:44:21 -07:00
power	for-5.18/block-2022-03-18	2022-03-21 16:48:55 -07:00
printk	printk changes for 5.18	2022-03-23 10:54:27 -07:00
rcu	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
sched	sched: Teach the forced-newidle balancer about CPU affinity limitation.	2022-04-05 09:59:36 +02:00
time	tick/sched: Fix non-kernel-doc comment	2022-04-10 12:23:34 +02:00
trace	bpf: Add bpf_skc_to_mptcp_sock_proto	2022-05-20 15:29:00 -07:00
.gitignore
acct.c
async.c	Revert "module, async: async_synchronize_full() on module init iff async is used"	2022-02-03 11:20:34 -08:00
audit.c	audit: improve audit queue handling when "audit=1" on cmdline	2022-01-25 13:22:51 -05:00
audit.h	audit: log AUDIT_TIME_* records only from rules	2022-02-22 13:51:40 -05:00
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c	audit/stable-5.17 PR 20220110	2022-01-11 13:08:21 -08:00
auditsc.c	audit/stable-5.18 PR 20220321	2022-03-21 20:53:11 -07:00
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
compat.c
configs.c
context_tracking.c
cpu.c	cpu/hotplug: Remove the 'cpu' member of cpuhp_cpu_state	2022-04-13 21:25:40 +02:00
cpu_pm.c
crash_core.c
crash_dump.c
cred.c	x86: Mark __invalid_creds() __noreturn	2022-03-15 10:32:44 +01:00
delayacct.c	delayacct: track delays from memory compact	2022-01-20 08:52:55 +02:00
dma.c
exec_domain.c
exit.c	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
extable.c	lkdtm: Really write into kernel text in WRITE_KERN	2022-02-16 23:25:12 +11:00
fail_function.c
fork.c	kasan, arm64: reset pointer tags of vmapped stacks	2022-03-24 19:06:47 -07:00
freezer.c
gen_kheaders.sh
groups.c
hung_task.c	hung_task: move hung_task sysctl interface to hung_task.c	2022-01-22 08:33:34 +02:00
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
kallsyms.c	ftrace: Add ftrace_lookup_symbols function	2022-05-10 14:42:06 -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: properly handle subsequent mmap calls	2022-03-23 19:00:35 -07:00
kexec.c
kexec_core.c
kexec_elf.c
kexec_file.c
kexec_internal.h
kheaders.c
kmod.c
kprobes.c	kprobes: Use rethook for kretprobe if possible	2022-03-28 19:38:09 -07:00
ksysfs.c	kernel/ksysfs.c: use helper macro __ATTR_RW	2022-03-23 19:00:33 -07:00
kthread.c	asm-generic updates for 5.18	2022-03-23 18:03:08 -07:00
latencytop.c
Makefile	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
module-internal.h	module: add in-kernel support for decompressing	2022-01-11 18:45:02 -08:00
module.c	NFSD: Remove svc_serv_ops::svo_module	2022-02-28 10:26:40 -05:00
module_decompress.c	module: fix building with sysfs disabled	2022-02-16 12:51:32 -08:00
module_signature.c
module_signing.c
notifier.c	notifier: Return an error when a callback has already been registered	2021-12-29 10:37:33 +01:00
nsproxy.c
padata.c	padata: replace cpumask_weight with cpumask_empty in padata.c	2022-01-31 11:21:46 +11:00
panic.c	panic: move panic_print before kmsg dumpers	2022-03-23 19:00:35 -07:00
params.c	kobject: remove kset from struct kset_uevent_ops callbacks	2021-12-28 11:26:18 +01:00
pid.c
pid_namespace.c
profile.c	exit: Remove profile_handoff_task	2022-01-08 12:43:57 -06:00
ptrace.c	ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE	2022-03-22 13:06:05 -05:00
range.c
reboot.c
regset.c
relay.c
resource.c	kernel/resource: fix kfree() of bootmem memory again	2022-03-23 19:00:35 -07:00
resource_kunit.c
rseq.c	rseq: Remove broken uapi field layout on 32-bit little endian	2022-02-02 13:11:34 +01:00
scftorture.c
scs.c	kasan, vmalloc: only tag normal vmalloc allocations	2022-03-24 19:06:48 -07:00
seccomp.c	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
signal.c	Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"	2022-03-31 10:36:55 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-13 18:44:35 +02:00
smpboot.c
smpboot.h
softirq.c	genirq, softirq: Use in_hardirq() instead of in_irq()	2022-02-02 21:34:19 +01:00
stackleak.c	gcc-plugins/stackleak: Use noinstr in favor of notrace	2022-02-03 17:02:21 -08:00
stacktrace.c	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
static_call.c	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
static_call_inline.c	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
stop_machine.c
sys.c	prlimit: do not grab the tasklist_lock	2022-03-08 14:33:36 -06:00
sys_ni.c	mm/mempolicy: wire up syscall set_mempolicy_home_node	2022-01-15 16:30:30 +02:00
sysctl-test.c
sysctl.c	bpf: Move BPF sysctls from kernel/sysctl.c to BPF core	2022-04-13 21:36:56 +02:00
task_work.c	resume_user_mode: Move to resume_user_mode.h	2022-03-10 16:51:50 -06:00
taskstats.c	taskstats: remove unneeded dead assignment	2022-03-23 19:00:35 -07:00
torture.c	torture: Wake up kthreads after storing task_struct pointer	2022-02-01 17:24:39 -08:00
tracepoint.c
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-01-08 12:43:57 -06:00
ucount.c	ucounts: Handle wrapping in is_ucounts_overlimit	2022-02-17 09:11:57 -06:00
uid16.c
uid16.h
umh.c
up.c
user-return-notifier.c
user.c
user_namespace.c	ucounts: Fix systemd LimitNPROC with private users regression	2022-02-25 10:40:14 -06:00
usermode_driver.c
utsname.c
utsname_sysctl.c
watch_queue.c	watch_queue: Free the page array when watch_queue is dismantled	2022-04-02 10:37:39 -07:00
watchdog.c	sched/isolation: Use single feature type while referring to housekeeping cpumask	2022-02-16 15:57:55 +01:00
watchdog_hld.c
workqueue.c	Merge branch 'for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2022-03-23 12:40:51 -07:00
workqueue_internal.h