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Sergei Trofimovich 0ceb1ace4a ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls 
In https://bugs.gentoo.org/769614 Dmitry noticed that
`ptrace(PTRACE_GET_SYSCALL_INFO)` does not work for syscalls called via
glibc's syscall() wrapper.

ia64 has two ways to call syscalls from userspace: via `break` and via
`eps` instructions.

The difference is in stack layout:

1. `eps` creates simple stack frame: no locals, in{0..7} == out{0..8}
2. `break` uses userspace stack frame: may be locals (glibc provides
   one), in{0..7} == out{0..8}.

Both work fine in syscall handling cde itself.

But `ptrace(PTRACE_GET_SYSCALL_INFO)` uses unwind mechanism to
re-extract syscall arguments but it does not account for locals.

The change always skips locals registers. It should not change `eps`
path as kernel's handler already enforces locals=0 and fixes `break`.

Tested on v5.10 on rx3600 machine (ia64 9040 CPU).

Link: https://lkml.kernel.org/r/20210221002554.333076-1-slyfox@gentoo.org
Link: https://bugs.gentoo.org/769614
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2021-03-13 11:27:31 -08:00
..
syscalls Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Makefile ia64: remove generated/nr-irqs.h generation to fix build warning 2021-02-12 05:11:19 +09:00
Makefile.gate ia64: require -Wl,--hash-style=sysv 2019-05-18 11:29:01 +09:00
acpi-ext.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
acpi.c ACPI/sleep: Convert acpi_wakeup_address into a function 2019-12-10 10:15:48 +01:00
asm-offsets.c ia64: do not typedef struct pal_min_state_area_s 2021-02-12 05:11:19 +09:00
audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
brl_emu.c signal: Remove the task parameter from force_sig_fault 2019-05-29 09:31:43 -05:00
crash.c Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
crash_dump.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cyclone.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
dma-mapping.c dma-mapping: split <linux/dma-mapping.h> 2020-10-06 07:07:03 +02:00
efi.c Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
efi_stub.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
elfcore.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
entry.S ia64: enable HAVE_COPY_THREAD_TLS, switch to kernel_clone_args 2020-06-23 10:49:56 +02:00
entry.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_inject.c ia64/err-inject: fix spelling mistake: "capapbilities" -> "capabilities" 2018-03-05 14:44:53 -08:00
esi.c efi/ia64: Use existing helpers to locate ESI table 2020-02-23 21:59:42 +01:00
esi_stub.S treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
fsys.S docs: ia64: convert to ReST 2019-07-15 09:20:25 -03:00
fsyscall_gtod_data.h Stop ia64 being the last holdout using GENERIC_TIME_VSYSCALL_OLD 2017-11-13 12:15:40 -08:00
ftrace.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
gate-data.S Rename .data.gate to .data..gate. 2010-03-03 11:25:59 +01:00
gate.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gate.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
ia64_ksyms.c ia64: fix min_low_pfn/max_low_pfn build errors 2020-09-01 19:34:11 +03:00
iosapic.c locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header 2020-08-06 16:13:13 +02:00
irq.c locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header 2020-08-06 16:13:13 +02:00
irq.h ia64: replace setup_irq() by request_irq() 2020-03-13 15:21:28 -07:00
irq_ia64.c ia64: Remove perfmon 2020-09-11 09:34:32 -07:00
irq_lsapic.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ivt.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
kprobes.c ia64: kprobes: Use generic kretprobe trampoline handler 2020-09-08 11:52:33 +02:00
machine_kexec.c efi: ia64: move IA64-only declarations to new asm/efi.h header 2021-01-18 13:50:37 +01:00
mca.c Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
mca_asm.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
mca_drv.c ia64: do not typedef struct pal_min_state_area_s 2021-02-12 05:11:19 +09:00
mca_drv.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mca_drv_asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
minstate.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
msi_ia64.c ia64: remove now unused machvec indirections 2019-08-16 11:33:57 -07:00
numa.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pal.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
palinfo.c arch: ia64: Remove rest of perfmon support 2021-01-22 12:12:20 +05:30
patch.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci-dma.c ia64 for v5.4 - big change here is removal of support for SGI Altix 2019-09-16 15:32:01 -07:00
perfmon_itanium.h arch: ia64: Remove rest of perfmon support 2021-01-22 12:12:20 +05:30
process.c arch: setup PF_IO_WORKER threads like PF_KTHREAD 2021-02-21 17:25:22 -07:00
ptrace.c ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls 2021-03-13 11:27:31 -08:00
relocate_kernel.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
sal.c locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header 2020-08-06 16:13:13 +02:00
salinfo.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
setup.c locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header 2020-08-06 16:13:13 +02:00
sigframe.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
signal.c ia64: don't call handle_signal() unless there's actually a signal queued 2021-03-02 17:22:11 -07:00
smp.c A set of locking fixes and updates: 2020-08-10 19:07:44 -07:00
smpboot.c efi: ia64: move IA64-only declarations to new asm/efi.h header 2021-01-18 13:50:37 +01:00
stacktrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_ia64.c ia64: remove CONFIG_PCI ifdefs 2019-08-16 11:33:57 -07:00
time.c EFI updates for v5.12 2021-02-20 19:09:26 -08:00
topology.c ia64: remove CONFIG_ACPI ifdefs 2019-08-16 11:33:57 -07:00
traps.c signal: Remove the task parameter from force_sig_fault 2019-05-29 09:31:43 -05:00
unaligned.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
uncached.c efi: ia64: move IA64-only declarations to new asm/efi.h header 2021-01-18 13:50:37 +01:00
unwind.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
unwind_decoder.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
unwind_i.h ia64: kernel: unwind_i.h: Replace zero-length array with flexible-array 2020-06-15 23:08:31 -05:00
vmlinux.lds.S vmlinux.lds.h: Split ELF_DETAILS from STABS_DEBUG 2020-09-01 09:50:35 +02:00