linux-stable/kernel
Ilya Leoshkevich 577c06af81 bpf: Disable zero-extension for BPF_MEMSX
On the architectures that use bpf_jit_needs_zext(), e.g., s390x, the
verifier incorrectly inserts a zero-extension after BPF_MEMSX, leading
to miscompilations like the one below:

      24:       89 1a ff fe 00 00 00 00 "r1 = *(s16 *)(r10 - 2);"       # zext_dst set
   0x3ff7fdb910e:       lgh     %r2,-2(%r13,%r0)                        # load halfword
   0x3ff7fdb9114:       llgfr   %r2,%r2                                 # wrong!
      25:       65 10 00 03 00 00 7f ff if r1 s> 32767 goto +3 <l0_1>   # check_cond_jmp_op()

Disable such zero-extensions. The JITs need to insert sign-extension
themselves, if necessary.

Suggested-by: Puranjay Mohan <puranjay12@gmail.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20230919101336.2223655-2-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-09-21 14:21:59 -07:00
..
bpf bpf: Disable zero-extension for BPF_MEMSX 2023-09-21 14:21:59 -07:00
cgroup cgroup: fix build when CGROUP_SCHED is not enabled 2023-09-02 08:27:17 -07:00
configs Kbuild updates for v6.6 2023-09-05 11:01:47 -07:00
debug printk changes for 6.6 2023-09-04 13:20:19 -07:00
dma Revert "dma-contiguous: check for memory region overlap" 2023-09-08 05:58:32 -03:00
entry entry: Remove empty addr_limit_user_check() 2023-08-23 10:32:39 +02:00
events powerpc updates for 6.6 2023-08-31 12:43:10 -07:00
futex mm/mm_init.c: remove obsolete macro HASH_SMALL 2023-08-18 10:12:07 -07:00
gcov gcov: shut up missing prototype warnings for internal stubs 2023-08-18 10:18:58 -07:00
irq Boring updates for the interrupt subsystem: 2023-08-28 14:33:11 -07:00
kcsan
livepatch
locking - An extensive rework of kexec and crash Kconfig from Eric DeVolder 2023-08-29 14:53:51 -07:00
module module/decompress: use vmalloc() for zstd decompression workspace 2023-08-29 09:39:08 -07:00
power PM: hibernate: Fix the exclusive get block device in test_resume mode 2023-09-12 11:45:15 +02:00
printk Revert "printk: export symbols for debug modules" 2023-09-07 14:19:42 +02:00
rcu TTY/Serial driver changes for 6.6-rc1 2023-09-01 09:38:00 -07:00
sched sched/fair: Fix SMT4 group_smt_balance handling 2023-09-13 15:03:06 +02:00
time Fix false positive "softirq work is pending" messages on -rt 2023-09-02 09:01:48 -07:00
trace Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2023-09-16 11:16:00 +01:00
.gitignore
acct.c audit/stable-6.6 PR 20230829 2023-08-30 08:17:35 -07:00
async.c
audit.c audit: move trailing statements to next line 2023-08-15 18:16:14 -04:00
audit.h audit: correct audit_filter_inodes() definition 2023-07-21 12:17:25 -04:00
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c audit: move trailing statements to next line 2023-08-15 18:16:14 -04:00
auditsc.c Including fixes from netfilter and bpf. 2023-09-07 18:33:07 -07:00
backtracetest.c
bounds.c
capability.c lsm: constify the 'target' parameter in security_capget() 2023-08-08 16:48:47 -04:00
cfi.c
compat.c
configs.c
context_tracking.c
cpu.c cpu/hotplug: Prevent self deadlock on CPU hot-unplug 2023-08-30 12:24:22 +02:00
cpu_pm.c
crash_core.c - An extensive rework of kexec and crash Kconfig from Eric DeVolder 2023-08-29 14:53:51 -07:00
crash_dump.c
cred.c cred: convert printks to pr_<level> 2023-08-18 10:18:49 -07:00
delayacct.c
dma.c
exec_domain.c
exit.c
extable.c
fail_function.c
fork.c percpu: changes for v6.6 2023-09-01 15:44:45 -07:00
freezer.c
gen_kheaders.sh
groups.c
hung_task.c
iomem.c kernel/iomem.c: remove __weak ioremap_cache helper 2023-08-21 13:37:28 -07:00
irq_work.c
jump_label.c
kallsyms.c kallsyms: Change func signature for cleanup_symbol_name() 2023-08-25 15:00:36 -07:00
kallsyms_internal.h
kallsyms_selftest.c Modules changes for v6.6-rc1 2023-08-29 17:32:32 -07:00
kallsyms_selftest.h
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.kexec crash: hotplug support for kexec_load() 2023-08-24 16:25:14 -07:00
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c crash: hotplug support for kexec_load() 2023-08-24 16:25:14 -07:00
kexec_core.c crash: add generic infrastructure for crash hotplug support 2023-08-24 16:25:13 -07:00
kexec_elf.c
kexec_file.c integrity-v6.6 2023-08-30 09:16:56 -07:00
kexec_internal.h
kheaders.c
kprobes.c kernel: kprobes: Use struct_size() 2023-08-23 09:38:17 +09:00
ksyms_common.c
ksysfs.c crash: hotplug support for kexec_load() 2023-08-24 16:25:14 -07:00
kthread.c kthread: unexport __kthread_should_park() 2023-08-18 10:18:59 -07:00
latencytop.c
Makefile v6.5-rc1-modules-next 2023-06-28 15:51:08 -07:00
module_signature.c
notifier.c
nsproxy.c nsproxy: Convert nsproxy.count to refcount_t 2023-08-21 11:29:12 -07:00
padata.c
panic.c panic: Reenable preemption in WARN slowpath 2023-09-15 11:28:08 +02:00
params.c kernel: params: Remove unnecessary ‘0’ values from err 2023-07-10 12:47:01 -07:00
pid.c memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy 2023-08-21 13:37:59 -07:00
pid_namespace.c memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy 2023-08-21 13:37:59 -07:00
pid_sysctl.h memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy 2023-08-21 13:37:59 -07:00
profile.c
ptrace.c
range.c
reboot.c
regset.c
relay.c kernel: relay: remove unnecessary NULL values from relay_open_buf 2023-08-18 10:18:55 -07:00
resource.c
resource_kunit.c
rseq.c
scftorture.c scftorture: Pause testing after memory-allocation failure 2023-07-14 15:02:57 -07:00
scs.c
seccomp.c seccomp: Add missing kerndoc notations 2023-08-17 12:32:15 -07:00
signal.c signal: print comm and exe name on fatal signals 2023-08-18 10:18:50 -07:00
smp.c smp: Reduce NMI traffic from CSD waiters to CSD destination 2023-07-10 14:19:04 -07:00
smpboot.c
smpboot.h
softirq.c sched/core: introduce sched_core_idle_cpu() 2023-07-13 15:21:50 +02:00
stackleak.c
stacktrace.c
static_call.c
static_call_inline.c
stop_machine.c
sys.c prctl: move PR_GET_AUXV out of PR_MCE_KILL 2023-07-17 12:53:21 -07:00
sys_ni.c x86/shstk: Introduce map_shadow_stack syscall 2023-08-02 15:01:51 -07:00
sysctl-test.c
sysctl.c v6.5-rc1-sysctl-next 2023-06-28 16:05:21 -07:00
task_work.c
taskstats.c
torture.c torture: Stop right-shifting torture_random() return values 2023-08-14 15:01:08 -07:00
tracepoint.c
tsacct.c
ucount.c sysctl: Add size to register_sysctl 2023-08-15 15:26:17 -07:00
uid16.c
uid16.h
umh.c sysctl: fix unused proc_cap_handler() function warning 2023-06-29 15:19:43 -07:00
up.c
user-return-notifier.c
user.c
user_namespace.c
usermode_driver.c
utsname.c
utsname_sysctl.c
vhost_task.c
watch_queue.c
watchdog.c watchdog/hardlockup: avoid large stack frames in watchdog_hardlockup_check() 2023-08-18 10:19:00 -07:00
watchdog_buddy.c watchdog/hardlockup: move SMP barriers from common code to buddy code 2023-06-19 16:25:28 -07:00
watchdog_perf.c
workqueue.c workqueue: fix data race with the pwq->stats[] increment 2023-08-29 09:52:16 -10:00
workqueue_internal.h workqueue: Drop the special locking rule for worker->flags and worker_pool->flags 2023-08-07 15:57:22 -10:00