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Sergei Trofimovich 533c293f73 ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign 
[ Upstream commit 61bf318eac ]

In https://bugs.gentoo.org/769614 Dmitry noticed that
`ptrace(PTRACE_GET_SYSCALL_INFO)` does not return error sign properly.

The bug is in mismatch between get/set errors:

static inline long syscall_get_error(struct task_struct *task,
                                     struct pt_regs *regs)
{
        return regs->r10 == -1 ? regs->r8:0;
}

static inline long syscall_get_return_value(struct task_struct *task,
                                            struct pt_regs *regs)
{
        return regs->r8;
}

static inline void syscall_set_return_value(struct task_struct *task,
                                            struct pt_regs *regs,
                                            int error, long val)
{
        if (error) {
                /* error < 0, but ia64 uses > 0 return value */
                regs->r8 = -error;
                regs->r10 = -1;
        } else {
                regs->r8 = val;
                regs->r10 = 0;
        }
}

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

Link: https://lkml.kernel.org/r/20210221002554.333076-2-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>
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2021-03-30 14:31:52 +02:00
..
alpha local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
arc arch/arc: add copy_user_page() to <asm/page.h> to fix build error on ARC 2021-01-19 18:27:26 +01:00
arm ARM: efistub: replace adrl pseudo-op with adr_l macro invocation 2021-03-17 17:06:26 +01:00
arm64 KVM: arm64: Fix nVHE hyp panic host context restore 2021-03-17 17:06:37 +01:00
c6x arch-cleanup-2020-10-22 2020-10-23 10:06:38 -07:00
csky csky: Fix a size determination in gpr_get() 2021-03-04 11:38:21 +01:00
h8300 h8300: fix PREEMPTION build, TI_PRE_COUNT undefined 2021-02-17 11:02:28 +01:00
hexagon local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
ia64 ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign 2021-03-30 14:31:52 +02:00
m68k local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
microblaze local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
mips MIPS: compressed: fix build with enabled UBSAN 2021-03-25 09:04:12 +01:00
nds32 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
nios2 nios2: fixed broken sys_clone syscall 2021-03-04 11:38:16 +01:00
openrisc sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
parisc parisc: Enable -mlong-calls gcc option with CONFIG_COMPILE_TEST 2021-03-11 14:17:21 +01:00
powerpc powerpc/4xx: Fix build errors from mfdcr() 2021-03-30 14:31:47 +02:00
riscv RISC-V: correct enum sbi_ext_rfence_fid 2021-03-25 09:04:09 +01:00
s390 s390/pci: fix leak of PCI device structure 2021-03-25 09:04:05 +01:00
sh sh: Remove unused HAVE_COPY_THREAD_TLS macro 2021-01-27 11:55:20 +01:00
sparc sparc64: Fix opcode filtering in handling of no fault loads 2021-03-30 14:31:50 +02:00
um um: defer killing userspace on page table update failures 2021-03-04 11:38:42 +01:00
x86 x86/apic/of: Fix CPU devicetree-node lookups 2021-03-25 09:04:18 +01:00
xtensa local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00