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702644249d
linux/arch/s390/kernel
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Heiko Carstens 702644249d s390/fpu: get rid of test_fp_ctl() 
It is quite subtle to use test_fp_ctl() correctly. Therefore remove it -
instead copy whatever new floating point control (fpc) register values are
supposed to be used into its save area.

Test the validity of the new value when loading it. If the new value is
invalid, load the fpc register with zero.

This seems to be a the best way to approach this problem. Even though this
changes behavior:

- sigreturn with an invalid fpc value on the stack will succeed, and
  continue with zero value, instead of returning with SIGSEGV

- ptraced processes will also use a zero value instead of letting the
  request fail with -EINVAL

However all of this seems to acceptable. After all testing of the value was
only implemented to avoid that user space can crash the kernel. It is not
there to test values for validity; and the assumption is that there is no
existing user space which is doing this.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
2023-12-11 14:33:06 +01:00
..
syscalls asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
vdso32 kbuild: unify vdso_install rules 2023-10-28 21:09:02 +09:00
vdso64 kbuild: unify vdso_install rules 2023-10-28 21:09:02 +09:00
.gitignore
abs_lowcore.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
alternative.c s390/alternatives: remove padding generation code 2022-05-17 15:16:28 +02:00
asm-offsets.c s390/tracing: pass struct ftrace_regs to ftrace_trace_function 2023-07-24 12:12:24 +02:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
audit.h
cache.c s390/cache: change type from unsigned long long to unsigned long 2023-01-25 20:51:09 +01:00
cert_store.c s390/cert_store: fix string length handling 2023-09-19 13:25:44 +02:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
compat_linux.c
compat_linux.h s390/compat: cleanup compat_linux.h header file 2022-05-06 20:45:16 +02:00
compat_ptrace.h
compat_signal.c s390/fpu: get rid of test_fp_ctl() 2023-12-11 14:33:06 +01:00
cpcmd.c s390: include linux/io.h instead of asm/io.h 2023-07-03 11:19:40 +02:00
cpufeature.c s390/uvdevice: autoload module based on CPU facility 2022-07-19 16:18:49 +02:00
crash_dump.c s390/crash: fix virtual vs physical address confusion 2023-10-16 13:04:09 +02:00
ctlreg.c s390/ctlreg: add system_ctl_load() 2023-09-19 13:26:57 +02:00
debug.c S390: Remove now superfluous sentinel elem from ctl_table arrays 2023-10-10 15:22:02 -07:00
diag.c s390/diag: add missing virt_to_phys() translation to diag224() 2023-10-23 18:21:23 +02:00
dis.c s390: fix various typos 2023-07-03 11:19:42 +02:00
dumpstack.c s390/dumpstack: simplify in stack logic code 2023-04-04 18:34:55 +02:00
early_printk.c
early.c s390/cmma: move parsing of cmma kernel parameter to early boot code 2023-11-05 22:34:57 +01:00
earlypgm.S s390/earlypgm: use SYM* macros instead of ENTRY(), etc. 2023-04-19 17:24:17 +02:00
ebcdic.c s390/ebcdic: fix typo in comment 2023-07-27 13:11:35 +02:00
entry.h init: consolidate prototypes in linux/init.h 2023-06-09 17:44:16 -07:00
entry.S s390: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-09 15:20:50 +02:00
fpu.c s390/fpu: get rid of test_fp_ctl() 2023-12-11 14:33:06 +01:00
ftrace.c s390/ftrace: do not assume module_alloc() returns executable memory 2023-04-13 17:36:26 +02:00
ftrace.h s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
guarded_storage.c s390: use control register bit defines 2023-09-19 13:26:57 +02:00
head64.S s390: consistently use .balign instead of .align 2023-06-28 13:57:09 +02:00
idle.c sched/idle: Mark arch_cpu_idle_dead() __noreturn 2023-03-08 08:44:28 -08:00
ima_arch.c
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
ipl.c s390: use control register bit defines 2023-09-19 13:26:57 +02:00
irq.c s390/ctlreg: add local and system prefix to some functions 2023-09-19 13:26:56 +02:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kdebugfs.c
kexec_elf.c
kexec_image.c
kprobes_insn_page.S s390: consistently use .balign instead of .align 2023-06-28 13:57:09 +02:00
kprobes.c s390/ctlreg: add struct ctlreg 2023-09-19 13:26:56 +02:00
kprobes.h s390/kprobes: define insn cache ops within private header file 2022-11-23 16:24:07 +01:00
lgr.c s390/lgr: use simple assignment instead of memcpy 2022-02-06 23:31:29 +01:00
machine_kexec_file.c s390/ipl: fix virtual vs physical address confusion 2023-08-18 15:08:12 +02:00
machine_kexec_reloc.c
machine_kexec.c s390/ctlreg: add struct ctlreg 2023-09-19 13:26:56 +02:00
Makefile s390/ctlreg: move control register code to separate file 2023-09-19 13:26:56 +02:00
mcount.S s390: remove unneeded #include <asm/export.h> 2023-08-09 15:20:50 +02:00
module.c s390/module: fix rela calculation for R_390_GOTENT 2023-06-20 19:55:00 +02:00
nmi.c s390/nmi: implement and use local_mcck_save() / local_mcck_restore() 2023-12-11 14:33:05 +01:00
nospec-branch.c s390: fix various typos 2023-07-03 11:19:42 +02:00
nospec-sysfs.c s390: introduce nospec_uses_trampoline() 2021-10-26 15:21:29 +02:00
numa.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
os_info.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
perf_cpum_cf_events.c s390/cpumf: add new extended counter set for IBM z16 2022-05-16 10:58:33 +02:00
perf_cpum_cf.c s390: use control register bit defines 2023-09-19 13:26:57 +02:00
perf_cpum_sf.c s390/cpum_sf: remove check on CPU being online 2023-07-04 07:45:18 +02:00
perf_event.c s390/perf: implement perf_callchain_user() 2023-11-05 22:34:57 +01:00
perf_pai_crypto.c s390/pai_crypto: remove per-cpu variable assignement in event initialization 2023-10-25 15:08:29 +02:00
perf_pai_ext.c s390/pai: initialize event count once at initialization 2023-10-25 15:08:29 +02:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c s390: include linux/io.h instead of asm/io.h 2023-07-03 11:19:40 +02:00
processor.c s390/bp: remove s390_isolate_bp_guest() 2023-03-13 09:16:42 +01:00
ptrace.c s390/fpu: get rid of test_fp_ctl() 2023-12-11 14:33:06 +01:00
reipl.S s390/reipl: use SYM* macros instead of ENTRY(), etc. 2023-04-19 17:24:17 +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
setup.c s390/nmi: consistently enable machine checks in trap_init() 2023-12-11 14:33:05 +01:00
signal.c s390/fpu: get rid of test_fp_ctl() 2023-12-11 14:33:06 +01:00
smp.c s390 updates for the 6.7 merge window 2023-11-03 10:17:22 -10:00
stacktrace.c s390: add USER_STACKTRACE support 2023-11-05 22:34:57 +01:00
sthyi.c s390 updates for 6.6 merge window 2023-08-28 17:22:39 -07:00
syscall.c s390: add support for BEAR enhancement facility 2021-10-26 15:21:29 +02:00
sysinfo.c s390/sysinfo: add variable capacity information 2023-11-22 14:07:28 +01:00
text_amode31.S s390/amode31: use SYM* macros instead of ENTRY(), etc. 2023-04-19 17:24:16 +02:00
time.c s390: use control register bit defines 2023-09-19 13:26:57 +02:00
topology.c sysctl-6.7-rc1 2023-11-01 20:51:41 -10:00
trace.c
traps.c s390/nmi: consistently enable machine checks in trap_init() 2023-12-11 14:33:05 +01:00
unwind_bc.c s390/unwind: avoid duplicated unwinding entries for kretprobes 2022-03-27 22:18:39 +02:00
uprobes.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
uv.c s390/uv: UV feature check utility 2023-08-28 09:27:55 +00:00
vdso.c mm: remove zap_page_range and create zap_vma_pages 2023-01-18 17:12:55 -08:00
vmlinux.lds.S s390/fpu: get rid of test_fp_ctl() 2023-12-11 14:33:06 +01:00
vtime.c cputime: remove cputime_to_nsecs fallback 2022-12-27 12:52:17 +01:00