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Message-Id: <20180528100319.614328600@linuxfoundation.org>
Date: Mon, 28 May 2018 11:56:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, James Hogan <jhogan@...nel.org>,
"Maciej W. Rozycki" <macro@...s.com>,
Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org
Subject: [PATCH 4.14 002/496] MIPS: ptrace: Expose FIR register through FP regset
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Maciej W. Rozycki <macro@...s.com>
commit 71e909c0cdad28a1df1fa14442929e68615dee45 upstream.
Correct commit 7aeb753b5353 ("MIPS: Implement task_user_regset_view.")
and expose the FIR register using the unused 4 bytes at the end of the
NT_PRFPREG regset. Without that register included clients cannot use
the PTRACE_GETREGSET request to retrieve the complete FPU register set
and have to resort to one of the older interfaces, either PTRACE_PEEKUSR
or PTRACE_GETFPREGS, to retrieve the missing piece of data. Also the
register is irreversibly missing from core dumps.
This register is architecturally hardwired and read-only so the write
path does not matter. Ignore data supplied on writes then.
Fixes: 7aeb753b5353 ("MIPS: Implement task_user_regset_view.")
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Maciej W. Rozycki <macro@...s.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
Cc: <stable@...r.kernel.org> # 3.13+
Patchwork: https://patchwork.linux-mips.org/patch/19273/
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/mips/kernel/ptrace.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -454,7 +454,7 @@ static int fpr_get_msa(struct task_struc
/*
* Copy the floating-point context to the supplied NT_PRFPREG buffer.
* Choose the appropriate helper for general registers, and then copy
- * the FCSR register separately.
+ * the FCSR and FIR registers separately.
*/
static int fpr_get(struct task_struct *target,
const struct user_regset *regset,
@@ -462,6 +462,7 @@ static int fpr_get(struct task_struct *t
void *kbuf, void __user *ubuf)
{
const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
+ const int fir_pos = fcr31_pos + sizeof(u32);
int err;
if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
@@ -474,6 +475,12 @@ static int fpr_get(struct task_struct *t
err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.fcr31,
fcr31_pos, fcr31_pos + sizeof(u32));
+ if (err)
+ return err;
+
+ err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &boot_cpu_data.fpu_id,
+ fir_pos, fir_pos + sizeof(u32));
return err;
}
@@ -522,7 +529,8 @@ static int fpr_set_msa(struct task_struc
/*
* Copy the supplied NT_PRFPREG buffer to the floating-point context.
* Choose the appropriate helper for general registers, and then copy
- * the FCSR register separately.
+ * the FCSR register separately. Ignore the incoming FIR register
+ * contents though, as the register is read-only.
*
* We optimize for the case where `count % sizeof(elf_fpreg_t) == 0',
* which is supposed to have been guaranteed by the kernel before
@@ -536,6 +544,7 @@ static int fpr_set(struct task_struct *t
const void *kbuf, const void __user *ubuf)
{
const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
+ const int fir_pos = fcr31_pos + sizeof(u32);
u32 fcr31;
int err;
@@ -563,6 +572,11 @@ static int fpr_set(struct task_struct *t
ptrace_setfcr31(target, fcr31);
}
+ if (count > 0)
+ err = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ fir_pos,
+ fir_pos + sizeof(u32));
+
return err;
}
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