From: "Alexey Gladkov (Intel)" <legion@kernel.org>
Try to avoid crossing the page boundary to avoid side effects if the
next page belongs to another VMA.
Signed-off-by: Alexey Gladkov (Intel) <legion@kernel.org>
---
arch/x86/kernel/umip.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/arch/x86/kernel/umip.c b/arch/x86/kernel/umip.c
index 5a4b21389b1d..e85c3cafc258 100644
--- a/arch/x86/kernel/umip.c
+++ b/arch/x86/kernel/umip.c
@@ -338,7 +338,6 @@ bool fixup_umip_exception(struct pt_regs *regs)
int nr_copied, reg_offset, dummy_data_size, umip_inst;
/* 10 bytes is the maximum size of the result of UMIP instructions */
unsigned char dummy_data[10] = { 0 };
- unsigned char buf[MAX_INSN_SIZE];
unsigned long *reg_addr;
void __user *uaddr;
struct insn insn;
@@ -350,11 +349,7 @@ bool fixup_umip_exception(struct pt_regs *regs)
* Give up on emulation if fetching the instruction failed. Should a
* page fault or a #GP be issued?
*/
- nr_copied = insn_fetch_from_user(regs, buf);
- if (nr_copied <= 0)
- return false;
-
- if (!insn_decode_from_regs(&insn, regs, buf, nr_copied))
+ if (insn_fetch_decode_from_user(&insn, regs))
return false;
umip_inst = identify_insn(&insn);
--
2.45.2