diff options
| -rw-r--r-- | arch/x86/entry/common.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 90214652ff06..4c7154d097c1 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -110,10 +110,10 @@ __visible noinstr bool do_syscall_64(struct pt_regs *regs, int nr) * in kernel space. This essentially lets the user take over * the kernel, since userspace controls RSP. * - * Change top bits to match the most significant bit (47th or 56th bit - * depending on paging mode) in the address. + * TASK_SIZE_MAX covers all user-accessible addresses other than + * the deprecated vsyscall page. */ - if (unlikely(!__is_canonical_address(regs->ip, __VIRTUAL_MASK_SHIFT + 1))) + if (unlikely(regs->ip >= TASK_SIZE_MAX)) return false; /* |