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linux/arch/s390/kernel
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Vasily Gorbik e14622a758 s390/debug: Reject zero-length input in debug_input_flush_fn() 
debug_input_flush_fn() always copies one byte from the userspace buffer
with copy_from_user() regardless of the supplied write length. A
zero-length write therefore reads one byte beyond the caller's buffer.
If the stale byte happens to be '-' or a digit the debug log is
silently flushed. With an unmapped buffer the call returns -EFAULT.

Reject zero-length writes before copying from userspace.

Cc: stable@vger.kernel.org # v5.10+
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
2026-04-28 14:45:02 +02:00
..
diag s390: Remove superfluous newlines from inline assemblies 2025-09-29 13:52:08 +02:00
syscalls rseq: Implement sys_rseq_slice_yield() 2026-01-22 11:11:17 +01:00
vdso Updates for the VDSO subsystem: 2026-02-10 17:02:23 -08:00
.gitignore
abs_lowcore.c s390/lowcore: Convert relocated lowcore alternative to machine feature 2025-03-04 17:18:05 +01:00
alternative.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
asm-offsets.c KVM: s390: vsie: Avoid injecting machine check on signal 2026-03-16 16:56:39 +01:00
audit.c s390: Remove compat support 2025-11-17 11:10:38 +01:00
bpf.c s390: Introduce bpf_get_lowcore() kfunc 2026-03-03 08:35:07 -08:00
cache.c s390/cache: prevent rebuild of shared_cpu_list 2024-03-07 14:41:15 +01:00
cert_store.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpacf.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
cpcmd.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
cpufeature.c s390: Explicitly include <linux/export.h> 2025-06-17 18:18:02 +02:00
crash_dump.c s390: Explicitly include <linux/export.h> 2025-06-17 18:18:02 +02:00
ctlreg.c s390: Explicitly include <linux/export.h> 2025-06-17 18:18:02 +02:00
debug.c s390/debug: Reject zero-length input in debug_input_flush_fn() 2026-04-28 14:45:02 +02:00
dis.c s390/fault: Print unmodified PSW address on protection exception 2025-11-14 11:34:28 +01:00
dumpstack.c s390/fault: Print unmodified PSW address on protection exception 2025-11-14 11:34:28 +01:00
early_printk.c s390/early: Dump register contents and call trace for early crashes 2024-08-22 19:28:11 +02:00
early.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
ebcdic.c s390/ebcdic: fix typo in comment 2023-07-27 13:11:35 +02:00
entry.h s390/idle: Inline update_timer_idle() 2026-02-25 16:46:07 +01:00
entry.S s390 fixes for 7.0-rc6 2026-03-28 09:50:11 -07:00
facility.c s390: Explicitly include <linux/export.h> 2025-06-17 18:18:02 +02:00
fpu.c s390: Explicitly include <linux/export.h> 2025-06-17 18:18:02 +02:00
ftrace.c s390 updates for 6.15 merge window 2025-03-29 11:59:43 -07:00
ftrace.h s390/ftrace: Remove unused ftrace_plt_template* 2024-08-27 20:16:48 +02:00
guarded_storage.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
head.S s390: Rename head64.S to head.S 2025-11-25 15:28:07 +01:00
hiperdispatch.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
idle.c s390/idle: Inline update_timer_idle() 2026-02-25 16:46:07 +01:00
ipl_vmparm.c
ipl.c integrity: Eliminate weak definition of arch_get_secureboot() 2026-03-13 11:37:13 -04:00
irq.c s390: Revert "s390/irq/idle: Remove psw bits early" 2026-03-07 22:41:10 +01:00
jump_label.c
kdebugfs.c
kexec_elf.c s390: kexec: initialize kexec_buf struct 2025-09-03 17:10:37 -07:00
kexec_image.c s390: kexec: initialize kexec_buf struct 2025-09-03 17:10:37 -07:00
kprobes.c s390/cpufeature: Convert MACHINE_HAS_SEQ_INSN to cpu_has_seq_insn() 2025-03-04 17:18:04 +01:00
lgr.c s390: kernel: convert timeouts to use secs_to_jiffies() 2025-01-12 20:21:01 -08:00
machine_kexec_file.c module: Give MODULE_SIG_STRING a more descriptive name 2026-03-24 21:42:37 +00:00
machine_kexec_reloc.c
machine_kexec.c s390: Convert MACHINE_IS_[LPAR|VM|KVM], etc, machine_is_[lpar|vm|kvm]() 2025-03-04 17:18:07 +01:00
Makefile integrity-v7.1 2026-04-17 15:42:01 -07:00
mcount.S s390/tracing: Enable HAVE_FTRACE_GRAPH_FUNC 2024-12-26 10:50:05 -05:00
module.c s390: Add stackprotector support 2025-11-24 11:45:21 +01:00
nmi.c KVM: s390: vsie: Avoid injecting machine check on signal 2026-03-16 16:56:39 +01:00
nospec-branch.c s390/nospec: Push down alternative handling 2024-07-23 16:02:31 +02:00
nospec-sysfs.c s390/nospec: Switch over to sysfs_emit() 2024-10-25 16:03:24 +02:00
numa.c mm/memblock: add memblock_alloc_or_panic interface 2025-01-25 20:22:38 -08:00
os_info.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
perf_cpum_cf_events.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
perf_cpum_cf.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
perf_cpum_sf.c s390/cpum_sf: Cap sampling rate to prevent lsctl exception 2026-03-24 20:57:31 +01:00
perf_event.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
perf_pai.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
perf_regs.c s390: Remove compat support 2025-11-17 11:10:38 +01:00
process.c s390: Remove compat support 2025-11-17 11:10:38 +01:00
processor.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
ptrace.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
reipl.S s390/kdump: Make kdump ready for lowcore relocation 2024-07-23 16:02:32 +02:00
relocate_kernel.S s390/relocate_kernel: adjust indentation 2023-04-19 17:24:18 +02:00
rethook.c s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
rethook.h s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
runtime_instr.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
setup.c mm, arch: consolidate hugetlb CMA reservation 2026-01-26 20:02:19 -08:00
signal.c s390/vdso: Rename vdso64 to vdso 2025-11-25 15:28:07 +01:00
skey.c s390: Remove superfluous newlines from inline assemblies 2025-09-29 13:52:08 +02:00
smp.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
stackprotector.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
stacktrace.c s390/stacktrace: Do not fallback to RA register 2025-12-14 11:03:58 +01:00
sthyi.c s390: Fix double word in comments 2025-11-06 14:17:27 +01:00
syscall.c hardening updates for v7.1-rc1 2026-04-13 17:52:29 -07:00
sysinfo.c s390/sysinfo: Replace sprintf() with snprintf() for buffer safety 2025-10-21 10:17:29 +02:00
text_amode31.S s390/amode31: Use exrl instead of ex 2025-01-13 09:50:17 +01:00
time.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
topology.c s390: Remove KMSG_COMPONENT macro 2025-11-24 11:45:21 +01:00
trace.c
traps.c s390/bug: Skip __WARN_trap() in call traces 2026-01-27 12:16:16 +01:00
unwind_bc.c s390: Explicitly include <linux/export.h> 2025-06-17 18:18:02 +02:00
uprobes.c s390: Remove compat support 2025-11-17 11:10:38 +01:00
uv.c KVM: s390: Switch to new gmap 2026-02-04 17:00:10 +01:00
vdso.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vmcore_info.c s390: Remove __bootdata annotations from declarations 2024-12-15 16:19:04 +01:00
vmlinux.lds.S kbuild: Split .modinfo out from ELF_DETAILS 2026-02-26 11:50:19 -07:00
vtime.c s390/vtime: Use lockdep_assert_irqs_disabled() instead of BUG_ON() 2026-02-25 16:46:07 +01:00
wti.c s390/wti: Add debugfs file to display missed grace periods per cpu 2024-08-29 22:56:35 +02:00