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arm64: ptrace: fix empty registers set in prstatus of aarch32 process core

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Currently core file of aarch32 process prstatus note has empty
registers set. As result aarch32 core files create by V8 kernel are
not very useful.

It happens because compat_gpr_get and compat_gpr_set functions can
copy registers values to/from either kbuf or ubuf. ELF core file
collection function fill_thread_core_info calls compat_gpr_get
with kbuf set and ubuf set to 0. But current compat_gpr_get and
compat_gpr_set function handle copy to/from only ubuf case.

Fix is to handle kbuf and ubuf as two separate cases in similar
way as other functions like user_regset_copyout, user_regset_copyin do.

Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Victor Kamensky 2014-06-03 19:21:30 +01:00 committed by Catalin Marinas
parent 34c65c43f1
commit 2227901a02
1 changed files with 18 additions and 8 deletions
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26
arch/arm64/kernel/ptrace.c
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@ -655,11 +655,16 @@ static int compat_gpr_get(struct task_struct *target,
reg = task_pt_regs(target)->regs[idx];
}
ret = copy_to_user(ubuf, &reg, sizeof(reg));
if (ret)
break;
if (kbuf) {
memcpy(kbuf, &reg, sizeof(reg));
kbuf += sizeof(reg);
} else {
ret = copy_to_user(ubuf, &reg, sizeof(reg));
if (ret)
break;
ubuf += sizeof(reg);
ubuf += sizeof(reg);
}
}
return ret;
@ -689,11 +694,16 @@ static int compat_gpr_set(struct task_struct *target,
unsigned int idx = start + i;
compat_ulong_t reg;
ret = copy_from_user(&reg, ubuf, sizeof(reg));
if (ret)
return ret;
if (kbuf) {
memcpy(&reg, kbuf, sizeof(reg));
kbuf += sizeof(reg);
} else {
ret = copy_from_user(&reg, ubuf, sizeof(reg));
if (ret)
return ret;
ubuf += sizeof(reg);
ubuf += sizeof(reg);
}
switch (idx) {
case 15: