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metag/ptrace: Provide default TXSTATUS for short NT_PRSTATUS

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Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill TXSTATUS, a well-defined default value is used, based on the
task's current value.

Suggested-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Martin 2017-03-27 15:10:56 +01:00 committed by Linus Torvalds
parent a78ce80d2c
commit 5fe81fe981
1 changed files with 12 additions and 3 deletions
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15
arch/metag/kernel/ptrace.c
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@ -24,6 +24,16 @@
* user_regset definitions.
*/
static unsigned long user_txstatus(const struct pt_regs *regs)
{
unsigned long data = (unsigned long)regs->ctx.Flags;
if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
data |= USER_GP_REGS_STATUS_CATCH_BIT;
return data;
}
int metag_gp_regs_copyout(const struct pt_regs *regs,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
@ -62,9 +72,7 @@ int metag_gp_regs_copyout(const struct pt_regs *regs,
if (ret)
goto out;
/* TXSTATUS */
data = (unsigned long)regs->ctx.Flags;
if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
data |= USER_GP_REGS_STATUS_CATCH_BIT;
data = user_txstatus(regs);
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&data, 4*25, 4*26);
if (ret)
@ -119,6 +127,7 @@ int metag_gp_regs_copyin(struct pt_regs *regs,
if (ret)
goto out;
/* TXSTATUS */
data = user_txstatus(regs);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&data, 4*25, 4*26);
if (ret)