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powerpc/ptrace: Hard wire PT_SOFTE value to 1 in gpr_get() too

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The commit a8a4b03ab9 ("powerpc: Hard wire PT_SOFTE value to 1 in
ptrace & signals") changed ptrace_get_reg(PT_SOFTE) to report 0x1,
but PTRACE_GETREGS still copies pt_regs->softe as is.

This is not consistent and this breaks the user-regs-peekpoke test
from https://sourceware.org/systemtap/wiki/utrace/tests/

Reported-by: Jan Kratochvil <jan.kratochvil@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201119160247.GB5188@redhat.com
This commit is contained in:
Oleg Nesterov 2020-11-19 17:02:47 +01:00 committed by Michael Ellerman
parent 640586f8af
commit 324a69467f
2 changed files with 12 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
arch/powerpc/kernel/ptrace/ptrace-tm.c
View file

@ -87,6 +87,9 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
#ifdef CONFIG_PPC64
struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
#endif
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
@ -101,7 +104,9 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset,
membuf_write(&to, &target->thread.ckpt_regs, sizeof(struct user_pt_regs));
membuf_store(&to_msr, get_user_ckpt_msr(target));
#ifdef CONFIG_PPC64
membuf_store(&to_softe, 0x1ul);
#endif
return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
sizeof(struct user_pt_regs));
}

7
arch/powerpc/kernel/ptrace/ptrace-view.c
View file

@ -218,6 +218,9 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
#ifdef CONFIG_PPC64
struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
#endif
int i;
if (target->thread.regs == NULL)
@ -232,7 +235,9 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset,
membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs));
membuf_store(&to_msr, get_user_msr(target));
#ifdef CONFIG_PPC64
membuf_store(&to_softe, 0x1ul);
#endif
return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
sizeof(struct user_pt_regs));
}