Complement commit c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use
correct core dump register layout") and also reject outsized
PTRACE_SETREGSET requests to the NT_PRFPREG regset, like with the
NT_PRSTATUS regset.
Cc: stable@xxxxxxxxxxxxxxx # v3.17+
Fixes: c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use correct core dump register layout")
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxx>
---
arch/mips/kernel/ptrace.c | 3 +++
1 file changed, 3 insertions(+)
linux-mips-nt-prfpreg-size.diff
Index: linux-sfr-test/arch/mips/kernel/ptrace.c
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/ptrace.c 2017-11-28 23:52:40.373594000 +0000
+++ linux-sfr-test/arch/mips/kernel/ptrace.c 2017-11-28 23:52:47.058649000 +0000
@@ -533,6 +533,9 @@ static int fpr_set(struct task_struct *t
u32 fcr31;
int err;
+ if (pos + count > sizeof(elf_fpregset_t))
+ return -EIO;
+
init_fp_ctx(target);
if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))