Linus Torvalds 178ff87d2a sched_getaffinity: don't assume 'cpumask_size()' is fully initialized ... [ Upstream commit 6015b1aca1 ] The getaffinity() system call uses 'cpumask_size()' to decide how big the CPU mask is - so far so good. It is indeed the allocation size of a cpumask. But the code also assumes that the whole allocation is initialized without actually doing so itself. That's wrong, because we might have fixed-size allocations (making copying and clearing more efficient), but not all of it is then necessarily used if 'nr_cpu_ids' is smaller. Having checked other users of 'cpumask_size()', they all seem to be ok, either using it purely for the allocation size, or explicitly zeroing the cpumask before using the size in bytes to copy it. See for example the ublk_ctrl_get_queue_affinity() function that uses the proper 'zalloc_cpumask_var()' to make sure that the whole mask is cleared, whether the storage is on the stack or if it was an external allocation. Fix this by just zeroing the allocation before using it. Do the same for the compat version of sched_getaffinity(), which had the same logic. Also, for consistency, make sched_getaffinity() use 'cpumask_bits()' to access the bits. For a cpumask_var_t, it ends up being a pointer to the same data either way, but it's just a good idea to treat it like you would a 'cpumask_t'. The compat case already did that. Reported-by: Ryan Roberts <ryan.roberts@arm.com> Link: https://lore.kernel.org/lkml/7d026744-6bd6-6827-0471-b5e8eae0be3f@arm.com/ Cc: Yury Norov <yury.norov@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-04-05 11:15:39 +02:00
..
bpf	bpf: Adjust insufficient default bpf_jit_limit	2023-04-05 11:15:34 +02:00
cgroup	memcg: fix possible use-after-free in memcg_write_event_control()	2022-12-14 11:28:27 +01:00
configs
debug	kdb: Make memory allocations more robust	2021-03-04 09:39:31 +01:00
dma	swiotlb: skip swiotlb_bounce when orig_addr is zero	2022-07-02 16:27:40 +02:00
events	perf: Fix possible memleak in pmu_dev_alloc()	2023-01-18 11:30:05 +01:00
gcov	gcov: add support for checksum field	2023-01-18 11:30:39 +01:00
irq	irqdomain: Drop bogus fwspec-mapping error handling	2023-03-11 16:31:52 +01:00
livepatch	livepatch: fix race between fork and KLP transition	2022-10-26 13:19:23 +02:00
locking	locking/lockdep: Avoid RCU-induced noinstr fail	2021-11-26 11:36:04 +01:00
power	PM: hibernate: Allow hybrid sleep to work with s2idle	2022-11-03 23:52:31 +09:00
printk	printk: fix return value of printk.devkmsg __setup handler	2022-04-15 14:14:45 +02:00
rcu	rcu: Suppress smp_processor_id() complaint in synchronize_rcu_expedited_wait()	2023-03-11 16:31:45 +01:00
sched	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:15:39 +02:00
time	timers: Prevent union confusion from unexpected restart_syscall()	2023-03-11 16:31:46 +01:00
trace	ftrace: Fix invalid address access in lookup_rec() when index is 0	2023-03-22 13:27:12 +01:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2023-01-18 11:30:34 +01:00
async.c	Revert "module, async: async_synchronize_full() on module init iff async is used"	2022-02-23 11:58:38 +01:00
audit.c	audit: improve audit queue handling when "audit=1" on cmdline	2022-02-08 18:23:13 +01:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-09-05 10:26:28 +02:00
audit_tree.c	audit: Embed key into chunk	2019-12-13 08:51:11 +01:00
audit_watch.c	audit: CONFIG_CHANGE don't log internal bookkeeping as an event	2020-10-01 13:14:33 +02:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
auditsc.c	audit: print empty EXECVE args	2019-12-01 09:17:17 +01:00
backtracetest.c
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-11-13 11:08:47 -08:00
capability.c	LSM: generalize flag passing to security_capable	2020-01-23 08:21:29 +01:00
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:15:39 +02:00
configs.c
context_tracking.c
cpu.c	random: clear fast pool, crng, and batches in cpuhp bring up	2022-06-25 11:49:07 +02:00
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-06-22 09:05:28 +02:00
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	memcg: account security cred as well to kmemcg	2020-01-09 10:19:00 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c	exit: Use READ_ONCE() for all oops/warn limit reads	2023-02-06 07:49:46 +01:00
extable.c
fail_function.c	fail_function: Remove a redundant mutex unlock	2020-11-24 13:27:23 +01:00
fork.c	mm/hugetlb: initialize hugetlb_usage in mm_init	2021-09-22 11:48:09 +02:00
freezer.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
futex.c	mm, futex: fix shared futex pgoff on shmem huge page	2021-07-11 12:49:30 +02:00
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	locking/static_key: Fix false positive warnings on concurrent dec/inc	2021-03-04 09:39:30 +01:00
kallsyms.c	kallsyms: Refactor kallsyms_show_value() to take cred	2020-07-16 08:17:26 +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_core.c	kernel: kexec: remove the lock operation of system_transition_mutex	2021-02-03 23:23:23 +01:00
kexec_file.c	kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add]	2022-07-02 16:27:39 +02:00
kexec_internal.h
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-17 10:48:52 +02:00
kprobes.c	x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range	2023-03-11 16:31:51 +01:00
ksysfs.c
kthread.c	kthread: prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()	2021-07-11 12:49:31 +02:00
latencytop.c
Makefile	elfcore: fix building with clang	2021-02-10 09:21:06 +01:00
memremap.c	mm/memory_hotplug: shrink zones when offlining memory	2020-01-29 16:43:27 +01:00
module-internal.h
module.c	module: Don't wait for GOING modules	2023-02-06 07:49:41 +01:00
module_signing.c
notifier.c	x86/mm: split vmalloc_sync_all()	2020-03-25 08:06:13 +01:00
nsproxy.c
padata.c	padata: add separate cpuhp node for CPUHP_PADATA_DEAD	2021-08-08 08:54:30 +02:00
panic.c	exit: Use READ_ONCE() for all oops/warn limit reads	2023-02-06 07:49:46 +01:00
params.c
pid.c	Fix failure path in alloc_pid()	2019-01-13 09:51:06 +01:00
pid_namespace.c	memcg: enable accounting for pids in nested pid namespaces	2021-09-22 11:48:09 +02:00
profile.c	profiling: fix shift too large makes kernel panic	2022-08-25 11:15:20 +02:00
ptrace.c	ptrace: Reimplement PTRACE_KILL by always sending SIGKILL	2022-06-14 16:59:14 +02:00
range.c
reboot.c	reboot: fix overflow parsing reboot cpu number	2020-11-18 19:18:52 +01:00
relay.c	relay: fix type mismatch when allocating memory in relay_create_buf()	2023-01-18 11:30:08 +01:00
resource.c	resource: fix locking in find_next_iomem_res()	2019-09-16 08:22:20 +02:00
rseq.c
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2022-02-16 12:51:47 +01:00
signal.c	signal handling: don't use BUG_ON() for debugging	2022-07-21 21:09:32 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-20 09:12:50 +02:00
smpboot.c	kthread: Extract KTHREAD_IS_PER_CPU	2021-02-07 14:48:38 +01:00
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	prlimit: do_prlimit needs to have a speculation check	2023-01-24 07:11:49 +01:00
sys_ni.c	kernel/sys_ni: add compat entry for fadvise64_64	2022-09-05 10:26:28 +02:00
sysctl.c	proc: proc_skip_spaces() shouldn't think it is working on C strings	2022-12-08 11:18:32 +01:00
sysctl_binary.c
task_work.c
taskstats.c	taskstats: fix data-race	2020-01-09 10:18:59 +01:00
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing	2021-07-20 16:15:42 +02:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-02-23 11:58:39 +01:00
ucount.c
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-14 10:31:21 +02:00
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-22 10:59:39 +02:00
user-return-notifier.c
user.c	userns: use irqsave variant of refcount_dec_and_lock()	2018-08-22 10:52:47 -07:00
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: export lockup_detector_reconfigure	2022-08-25 11:15:46 +02:00
watchdog_hld.c	watchdog: Mark watchdog touch functions as notrace	2018-08-30 12:56:40 +02:00
workqueue.c	workqueue: don't skip lockdep work dependency in cancel_work_sync()	2022-09-28 11:02:58 +02:00
workqueue_internal.h