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android_kernel_samsung_sm8650/arch/s390/kernel
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Heiko Carstens 7a4d6481fb s390/ptrace: handle setting of fpc register correctly 
[ Upstream commit 8b13601d19c541158a6e18b278c00ba69ae37829 ]

If the content of the floating point control (fpc) register of a traced
process is modified with the ptrace interface the new value is tested for
validity by temporarily loading it into the fpc register.

This may lead to corruption of the fpc register of the tracing process:
if an interrupt happens while the value is temporarily loaded into the
fpc register, and within interrupt context floating point or vector
registers are used, the current fp/vx registers are saved with
save_fpu_regs() assuming they belong to user space and will be loaded into
fp/vx registers when returning to user space.

test_fp_ctl() restores the original user space fpc register value, however
it will be discarded, when returning to user space.

In result the tracer will incorrectly continue to run with the value that
was supposed to be used for the traced process.

Fix this by saving fpu register contents with save_fpu_regs() before using
test_fp_ctl().

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-02-05 20:12:49 +00:00
..
syscalls arch: syscalls: simplify uapi/kapi directory creation 2022-03-31 12:03:46 +09:00
vdso32 s390/vdso: remove -nostdlib compiler flag 2021-11-16 12:29:19 +01:00
vdso64 s390/vdso: Drop '-shared' from KBUILD_CFLAGS_64 2023-03-10 09:33:41 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
abs_lowcore.c s390/smp: rework absolute lowcore access 2022-09-14 16:46:00 +02:00
alternative.c s390/alternatives: remove padding generation code 2022-05-17 15:16:28 +02:00
asm-offsets.c s390/stack: add union to reflect kvm stack slot usages 2022-06-01 12:03:17 +02:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
audit.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
compat_linux.c s390: use generic UID16 implementation 2019-01-18 09:33:18 +01:00
compat_linux.h s390/compat: cleanup compat_linux.h header file 2022-05-06 20:45:16 +02:00
compat_ptrace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_signal.c s390/signal: fix typo in comments 2022-03-08 00:33:01 +01:00
cpcmd.c s390/cpcmd: use physical address for command and response 2021-10-26 15:21:28 +02:00
cpufeature.c s390/uvdevice: autoload module based on CPU facility 2022-07-19 16:18:49 +02:00
crash_dump.c use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
debug.c s390: move from strlcpy with unused retval to strscpy 2022-08-30 22:00:33 +02:00
diag.c s390/extable: move EX_TABLE define to asm-extable.h 2022-03-08 00:33:00 +01:00
dis.c s390/disassembler: update opcode table 2021-12-16 19:58:07 +01:00
dumpstack.c exit: Add and use make_task_dead. 2021-12-13 12:04:45 -06:00
early_printk.c s390/sclp: remove unused sclp_early_printk_forced 2020-09-21 08:08:44 +02:00
early.c s390/early: fix sclp_early_sccb variable lifetime 2023-03-10 09:32:53 +01:00
earlypgm.S s390: generate register offsets into pt_regs automatically 2022-05-25 11:46:02 +02:00
ebcdic.c s390: ebcdic: convert comments to UTF-8 2018-08-23 18:48:43 -07:00
entry.h s390: simplify early program check handler 2022-05-25 11:46:02 +02:00
entry.S s390/mcck: isolate SIE instruction when setting CIF_MCCK_GUEST flag 2022-06-01 12:03:16 +02:00
fpu.c s390: convert to generic entry 2021-01-19 12:29:26 +01:00
ftrace.c ftrace: Remove return value of ftrace_arch_modify_*() 2022-05-26 21:13:00 -04:00
ftrace.h s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
guarded_storage.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
head64.S s390/early: fix sclp_early_sccb variable lifetime 2023-03-10 09:32:53 +01:00
idle.c s390/idle: mark arch_cpu_idle() noinstr 2023-03-10 09:33:52 +01:00
ima_arch.c s390/kexec_file: Disable kexec_load when IPLed secure 2019-04-29 10:44:03 +02:00
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/ipl: add missing secure/has_secure file to ipl type 'unknown' 2023-09-13 09:43:03 +02:00
irq.c s390/irq: utilize RCU instead of irq_lock_sparse() in show_msi_interrupt() 2022-04-27 12:53:34 +02:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kdebugfs.c s390: no need to check return value of debugfs_create functions 2019-01-28 15:58:55 +01:00
kexec_elf.c kexec: Fix file verification on S390 2019-09-10 13:27:51 +01:00
kexec_image.c kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE 2019-08-19 21:54:15 -07:00
kprobes_insn_page.S s390/kprobes: move insn_page to text segment 2020-10-09 23:45:30 +02:00
kprobes.c s390/kprobes: fix current_kprobe never cleared after kprobes reenter 2023-03-10 09:34:04 +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/kexec: fix ipl report address for kdump 2023-01-18 11:58:11 +01:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
machine_kexec.c s390/smp: rework absolute lowcore access 2022-09-14 16:46:00 +02:00
Makefile rethook, fprobe: do not trace rethook related functions 2023-05-24 17:32:53 +01:00
mcount.S s390/kprobes: Avoid additional kprobe in kretprobe handling 2022-03-10 15:58:17 +01:00
module.c jump_label: mips: move module NOP patching into arch code 2022-06-24 09:48:55 +02:00
nmi.c s390/boot: fix absolute zero lowcore corruption on boot 2022-09-07 14:04:01 +02:00
nospec-branch.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
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: uninline copy_oldmem_kernel() function 2022-09-14 16:46:01 +02:00
perf_cpum_cf_common.c s390/cpumf: Support for CPU Measurement Facility CSVN 7 2022-01-17 14:13:08 +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/cpumf: support user space events for counting 2024-01-10 17:10:30 +01:00
perf_cpum_sf.c s390/cpum_sf: add READ_ONCE() semantics to compare and swap loops 2023-01-18 11:58:12 +01:00
perf_event.c s390/stack: add union to reflect kvm stack slot usages 2022-06-01 12:03:17 +02:00
perf_pai_crypto.c perf: Use sample_flags for raw_data 2022-09-27 22:50:24 +02:00
perf_pai_ext.c s390/pai: fix raw data collection for PMU pai_ext 2022-10-26 14:47:31 +02:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c treewide: use get_random_{u8,u16}() when possible, part 2 2022-10-11 17:42:58 -06:00
processor.c s390/cpufeature: rework to allow more than only hwcap bits 2022-07-19 16:18:49 +02:00
ptrace.c s390/ptrace: handle setting of fpc register correctly 2024-02-05 20:12:49 +00:00
reipl.S s390: add missing ENDPROC statements to assembler functions 2019-05-02 13:54:11 +02:00
relocate_kernel.S s390/kexec: set end-of-ipl flag in last diag308 call 2022-04-25 13:54:12 +02:00
runtime_instr.c s390/runtime_instrumentation: fix storage key handling 2020-08-17 13:17:10 +02:00
setup.c s390: workaround invalid gcc-11 out of bounds read warning 2023-02-06 08:06:33 +01:00
signal.c ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
smp.c s390/mm: uninline copy_oldmem_kernel() function 2022-09-14 16:46:01 +02:00
stacktrace.c s390: remove invalid email address of Heiko Carstens 2022-02-06 23:31:29 +01:00
sthyi.c KVM: s390: fix sthyi error handling 2023-08-11 12:08:11 +02:00
syscall.c s390: add support for BEAR enhancement facility 2021-10-26 15:21:29 +02:00
sysinfo.c s390/extable: move EX_TABLE define to asm-extable.h 2022-03-08 00:33:00 +01:00
text_amode31.S s390/extable: move EX_TABLE define to asm-extable.h 2022-03-08 00:33:00 +01:00
time.c s390/stp: clock_delta should be signed 2022-05-11 14:40:57 +02:00
topology.c s390/topology: honour nr_cpu_ids when adding CPUs 2023-06-09 10:34:13 +02:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390/traps: improve panic message for translation-specification exception 2022-03-27 22:18:38 +02:00
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 KVM: s390: fix race in gmap_make_secure() 2023-05-17 11:53:38 +02:00
vdso.c treewide: use prandom_u32_max() when possible, part 1 2022-10-11 17:42:55 -06:00
vmlinux.lds.S s390: discard .interp section 2023-03-10 09:34:04 +01:00
vtime.c s390: assume stckf is always present 2022-03-10 15:58:17 +01:00