diff options
| author | marcel <marcel@FreeBSD.org> | 2003-08-13 03:20:10 +0000 |
|---|---|---|
| committer | marcel <marcel@FreeBSD.org> | 2003-08-13 03:20:10 +0000 |
| commit | ec1e7cccbaa3dfdfb058ff7ff7cde84f8b21c675 (patch) | |
| tree | 7bf58d8c969efe0c9af6e641ff5dcb75699cc689 /sys | |
| parent | 23077fe3b55685878e9a5cc253aac2a7311b2755 (diff) | |
| download | FreeBSD-src-ec1e7cccbaa3dfdfb058ff7ff7cde84f8b21c675.zip FreeBSD-src-ec1e7cccbaa3dfdfb058ff7ff7cde84f8b21c675.tar.gz | |
Don't use VM_MIN_KERNEL_ADDRESS to check if the faulting address is
in user space or kernel space. VM_MIN_KERNEL_ADDRESS starts after the
gateway page, which means that improper memory accesses to the gateway
page while in user mode would panic the kernel. Use VM_MAX_ADDRESS
instead. It ends before the gateway page. The difference between
VM_MIN_KERNEL_ADDRESS and VM_MAX_ADDRESS is exactly the gateway page.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/ia64/ia64/trap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/ia64/ia64/trap.c b/sys/ia64/ia64/trap.c index af2bea7..3391dff 100644 --- a/sys/ia64/ia64/trap.c +++ b/sys/ia64/ia64/trap.c @@ -589,10 +589,10 @@ trap(int vector, struct trapframe *framep) rv = 0; va = trunc_page(framep->tf_special.ifa); - if (va >= VM_MIN_KERNEL_ADDRESS) { + if (va >= VM_MAX_ADDRESS) { /* * Don't allow user-mode faults for kernel virtual - * addresses + * addresses, including the gateway page. */ if (user) goto no_fault_in; |
