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Catalin Marinas f077ee2609 BACKPORT: arm64: Introduce prctl() options to control the tagged user addresses ABI 
(Upstream commit 63f0c60379).

It is not desirable to relax the ABI to allow tagged user addresses into
the kernel indiscriminately. This patch introduces a prctl() interface
for enabling or disabling the tagged ABI with a global sysctl control
for preventing applications from enabling the relaxed ABI (meant for
testing user-space prctl() return error checking without reconfiguring
the kernel). The ABI properties are inherited by threads of the same
application and fork()'ed children but cleared on execve(). A Kconfig
option allows the overall disabling of the relaxed ABI.

The PR_SET_TAGGED_ADDR_CTRL will be expanded in the future to handle
MTE-specific settings like imprecise vs precise exceptions.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Change-Id: I2d52c5589b05415faab315c116245f1058d64750
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Bug: 135692346
2019-10-07 15:27:39 -04:00
..
bpf This is the 4.19.78 stable release 2019-10-07 19:17:35 +02:00
cgroup This is the 4.19.66 stable release 2019-08-11 15:21:36 +02:00
configs kconfig: tinyconfig: remove stale stack protector fixups 2018-06-15 07:15:28 +09:00
debug BACKPORT: sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD 2019-03-21 16:25:26 -07:00
dma dma-direct: do not include SME mask in the DMA supported check 2019-01-13 09:51:05 +01:00
events This is the 4.19.67 stable release 2019-08-16 11:27:10 +02:00
gcov UPSTREAM: gcov: clang support 2019-05-17 16:05:09 -07:00
irq genirq: Prevent NULL pointer dereference in resend_irqs() 2019-09-19 09:09:34 +02:00
livepatch livepatch: Nullify obj->mod in klp_module_coming()'s error path 2019-10-07 18:57:10 +02:00
locking locking/lockdep: Add debug_locks check in __lock_downgrade() 2019-10-01 08:26:07 +02:00
power ANDROID: Log which device failed to suspend in dpm_suspend_start() 2019-09-18 17:47:33 +00:00
printk printk: Do not lose last line in kmsg buffer dump 2019-10-05 13:10:01 +02:00
rcu rcuperf: Fix cleanup path for invalid perf_type strings 2019-05-31 06:46:30 -07:00
sched This is the 4.19.77 stable release 2019-10-06 11:27:45 +02:00
time alarmtimer: Use EOPNOTSUPP instead of ENOTSUPP 2019-10-05 13:10:07 +02:00
trace This is the 4.19.70 stable release 2019-09-06 12:08:42 +02:00
.gitignore BACKPORT: Provide in-kernel headers to make extending kernel easier 2019-06-12 12:33:20 +00:00
acct.c acct_on(): don't mess with freeze protection 2019-05-31 06:46:05 -07:00
async.c
audit.c audit: use ktime_get_coarse_real_ts64() for timestamps 2018-07-17 14:45:08 -04:00
audit.h
audit_fsnotify.c fsnotify: add fsnotify_add_inode_mark() wrappers 2018-05-18 14:58:22 +02:00
audit_tree.c \n 2018-08-17 09:41:28 -07:00
audit_watch.c audit: fix use-after-free in audit_add_watch 2018-07-18 11:43:36 -04:00
auditfilter.c audit: fix a memory leak bug 2019-05-31 06:46:17 -07:00
auditsc.c audit/stable-4.18 PR 20180814 2018-08-15 10:46:54 -07:00
backtracetest.c
bounds.c kbuild: fix kernel/bounds.c 'W=1' warning 2018-11-13 11:08:47 -08:00
capability.c
cfi.c ANDROID: add support for clang Control Flow Integrity (CFI) 2019-05-20 17:46:32 -07:00
compat.c BACKPORT: make 'user_access_begin()' do 'access_ok()' 2019-09-12 11:28:03 +00:00
configs.c
context_tracking.c
cpu.c This is the 4.19.60 stable release 2019-07-22 14:36:16 +02:00
cpu_pm.c
crash_core.c kernel/crash_core.c: print timestamp using time64_t 2018-08-22 10:52:47 -07:00
crash_dump.c
cred.c access: avoid the RCU grace period for the temporary subjective credentials 2019-07-31 07:27:11 +02:00
delayacct.c UPSTREAM: delayacct: track delays from thrashing cache pages 2019-03-21 16:25:26 -07:00
dma.c
elfcore.c
exec_domain.c
exit.c BACKPORT: make 'user_access_begin()' do 'access_ok()' 2019-09-12 11:28:03 +00:00
extable.c
fail_function.c bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe 2018-06-21 12:33:19 +02:00
fork.c UPSTREAM: pidfd: add polling support 2019-08-12 13:36:37 -04:00
freezer.c PM / reboot: Eliminate race between reboot and suspend 2018-08-06 12:35:20 +02:00
futex.c locking/futex: Allow low-level atomic operations to return -EAGAIN 2019-05-10 17:54:11 +02:00
futex_compat.c
gen_kheaders.sh BACKPORT: kheaders: Do not regenerate archive if config is not changed 2019-06-12 12:35:31 +00:00
groups.c
hung_task.c kernel: hung_task.c: disable on suspend 2019-04-20 09:16:02 +02:00
iomem.c
irq_work.c irq_work: Do not raise an IPI when queueing work on the local CPU 2019-05-31 06:46:19 -07:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-06-04 08:02:34 +02:00
kallsyms.c This is the 4.19.75 stable release 2019-09-21 07:55:26 +02:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt kconfig: include kernel/Kconfig.preempt from init/Kconfig 2018-08-02 08:06:54 +09:00
kcov.c kernel/kcov.c: mark write_comp_data() as notrace 2019-02-12 19:47:20 +01:00
kexec.c kexec: add call to LSM hook in original kexec_load syscall 2018-07-16 12:31:57 -07:00
kexec_core.c kexec: bail out upon SIGKILL when allocating memory. 2019-10-07 18:57:28 +02:00
kexec_file.c treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
kexec_internal.h
kheaders.c BACKPORT: kheaders: Move from proc to sysfs 2019-06-12 12:33:54 +00:00
kmod.c
kprobes.c kprobes: Prohibit probing on BUG() and WARN() address 2019-10-05 13:09:54 +02:00
ksysfs.c
kthread.c FROMLIST: refactor header includes to allow kthread.h inclusion in psi_types.h 2019-03-22 23:07:04 +00:00
latencytop.c
Makefile ANDROID: kernel/Makefile: do not disable LTO for sys_ni.c with CFI 2019-07-25 09:36:26 -07:00
memremap.c mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support 2019-01-13 09:51:04 +01:00
module-internal.h modsign: log module name in the event of an error 2018-07-02 11:36:17 +02:00
module.c This is the 4.19.74 stable release 2019-09-19 09:18:49 +02:00
module_signing.c modsign: log module name in the event of an error 2018-07-02 11:36:17 +02:00
notifier.c
nsproxy.c
padata.c padata: use smp_mb in padata_reorder to avoid orphaned padata jobs 2019-07-26 09:14:25 +02:00
panic.c panic: avoid deadlocks in re-entrant console drivers 2018-12-29 13:37:57 +01:00
params.c
pid.c UPSTREAM: pid: add pidfd_open() 2019-08-12 13:36:37 -04:00
pid_namespace.c signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig 2019-07-26 09:14:01 +02:00
profile.c
ptrace.c ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME 2019-07-10 09:53:41 +02:00
range.c
reboot.c PM / reboot: Eliminate race between reboot and suspend 2018-08-06 12:35:20 +02:00
relay.c relay: check return of create_buf_file() properly 2019-03-13 14:02:35 -07:00
resource.c resource: fix locking in find_next_iomem_res() 2019-09-16 08:22:20 +02:00
rseq.c rseq: uapi: Declare rseq_cs field as union, update includes 2018-07-10 22:18:52 +02:00
seccomp.c audit/stable-4.18 PR 20180605 2018-06-06 16:34:00 -07:00
signal.c UPSTREAM: pidfd: add polling support 2019-08-12 13:36:37 -04:00
smp.c cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM 2019-02-12 19:47:25 +01:00
smpboot.c smpboot: Remove cpumask from the API 2018-07-03 09:20:44 +02:00
smpboot.h
softirq.c nohz: Fix missing tick reprogram when interrupting an inline softirq 2018-08-03 15:52:10 +02:00
stacktrace.c
stop_machine.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-08-13 11:25:07 -07:00
sys.c BACKPORT: arm64: Introduce prctl() options to control the tagged user addresses ABI 2019-10-07 15:27:39 -04:00
sys_ni.c UPSTREAM: signal: support CLONE_PIDFD with pidfd_send_signal 2019-08-12 13:36:37 -04:00
sysctl.c This is the 4.19.51 stable release 2019-06-15 16:12:59 +02:00
sysctl_binary.c
task_work.c
taskstats.c
test_kprobes.c kprobes: Remove jprobe API implementation 2018-06-21 12:33:05 +02:00
torture.c torture: Keep old-school dmesg format 2018-06-25 11:30:10 -07:00
tracepoint.c tracepoint: Fix tracepoint array element size mismatch 2018-10-17 15:35:29 -04:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c umh: fix race condition 2018-06-07 16:56:28 -04:00
up.c
user-return-notifier.c
user.c ANDROID: proc: Add /proc/uid directory 2019-03-06 15:59:21 +00:00
user_namespace.c userns: also map extents in the reverse map to kernel IDs 2018-11-13 11:09:00 -08:00
utsname.c
utsname_sysctl.c sys: don't hold uts_sem while accessing userspace memory 2018-08-11 02:05:53 -05:00
watchdog.c watchdog: Respect watchdog cpumask on CPU hotplug 2019-04-03 06:26:29 +02:00
watchdog_hld.c watchdog: Mark watchdog touch functions as notrace 2018-08-30 12:56:40 +02:00
workqueue.c This is the 4.19.38 stable release 2019-05-02 10:13:34 +02:00
workqueue_internal.h UPSTREAM: psi: fix aggregation idle shut-off 2019-03-21 16:25:27 -07:00