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[ia64] ptrace_[sg]etregs(): use access_elf_reg() instead of access_uarea()

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In case of positions passed by ptrace_[sg]etregs() to access_uarea()
the latter sets the stack unwind up, walks all the way up the stack
and proceeds to pass the resulting info to access_elf_reg().  The thing
is, we'd *already* obtained that info, so we can bloody well call
access_elf_reg() directly.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-06 12:59:11 -04:00
parent 3b2d387c5e
commit 77f9c902f4
1 changed files with 23 additions and 20 deletions
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43
arch/ia64/kernel/ptrace.c
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@ -817,8 +817,8 @@ access_nat_bits (struct task_struct *child, struct pt_regs *pt,
}
static int
access_uarea (struct task_struct *child, unsigned long addr,
unsigned long *data, int write_access);
access_elf_reg(struct task_struct *target, struct unw_frame_info *info,
unsigned long addr, unsigned long *data, int write_access);
static long
ptrace_getregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
@ -847,13 +847,13 @@ ptrace_getregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
return -EIO;
}
if (access_uarea(child, PT_CR_IPSR, &psr, 0) < 0
|| access_uarea(child, PT_AR_EC, &ec, 0) < 0
|| access_uarea(child, PT_AR_LC, &lc, 0) < 0
|| access_uarea(child, PT_AR_RNAT, &rnat, 0) < 0
|| access_uarea(child, PT_AR_BSP, &bsp, 0) < 0
|| access_uarea(child, PT_CFM, &cfm, 0)
|| access_uarea(child, PT_NAT_BITS, &nat_bits, 0))
if (access_elf_reg(child, &info, ELF_CR_IPSR_OFFSET, &psr, 0) < 0 ||
access_elf_reg(child, &info, ELF_AR_EC_OFFSET, &ec, 0) < 0 ||
access_elf_reg(child, &info, ELF_AR_LC_OFFSET, &lc, 0) < 0 ||
access_elf_reg(child, &info, ELF_AR_RNAT_OFFSET, &rnat, 0) < 0 ||
access_elf_reg(child, &info, ELF_AR_BSP_OFFSET, &bsp, 0) < 0 ||
access_elf_reg(child, &info, ELF_CFM_OFFSET, &cfm, 0) < 0 ||
access_elf_reg(child, &info, ELF_NAT_OFFSET, &nat_bits, 0) < 0)
return -EIO;
/* control regs */
@ -972,7 +972,7 @@ ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
struct switch_stack *sw;
struct ia64_fpreg fpval;
struct pt_regs *pt;
long ret, retval = 0;
long retval = 0;
int i;
memset(&fpval, 0, sizeof(fpval));
@ -1097,17 +1097,16 @@ ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
retval |= __get_user(nat_bits, &ppr->nat);
retval |= access_uarea(child, PT_CR_IPSR, &psr, 1);
retval |= access_uarea(child, PT_AR_RSC, &rsc, 1);
retval |= access_uarea(child, PT_AR_EC, &ec, 1);
retval |= access_uarea(child, PT_AR_LC, &lc, 1);
retval |= access_uarea(child, PT_AR_RNAT, &rnat, 1);
retval |= access_uarea(child, PT_AR_BSP, &bsp, 1);
retval |= access_uarea(child, PT_CFM, &cfm, 1);
retval |= access_uarea(child, PT_NAT_BITS, &nat_bits, 1);
retval |= access_elf_reg(child, &info, ELF_CR_IPSR_OFFSET, &psr, 1);
retval |= access_elf_reg(child, &info, ELF_AR_RSC_OFFSET, &rsc, 1);
retval |= access_elf_reg(child, &info, ELF_AR_EC_OFFSET, &ec, 1);
retval |= access_elf_reg(child, &info, ELF_AR_LC_OFFSET, &lc, 1);
retval |= access_elf_reg(child, &info, ELF_AR_RNAT_OFFSET, &rnat, 1);
retval |= access_elf_reg(child, &info, ELF_AR_BSP_OFFSET, &bsp, 1);
retval |= access_elf_reg(child, &info, ELF_CFM_OFFSET, &cfm, 1);
retval |= access_elf_reg(child, &info, ELF_NAT_OFFSET, &nat_bits, 1);
ret = retval ? -EIO : 0;
return ret;
return retval ? -EIO : 0;
}
void
@ -1150,6 +1149,10 @@ ptrace_disable (struct task_struct *child)
user_disable_single_step(child);
}
static int
access_uarea (struct task_struct *child, unsigned long addr,
unsigned long *data, int write_access);
long
arch_ptrace (struct task_struct *child, long request,
unsigned long addr, unsigned long data)