Author: bdragon
Date: Thu May 28 00:49:02 2020
New Revision: 361568
URL: https://svnweb.freebsd.org/changeset/base/361568
Log:
[PowerPC] Fix radix crash when passing -1 from userspace
Found by running libc tests with radix enabled.
Detect unsigned integer wrapping with a postcondition.
Note: Radix MMU is not enabled by default yet.
Sponsored by: Tag1 Consulting, Inc.
Modified:
head/sys/powerpc/aim/mmu_radix.c
Modified: head/sys/powerpc/aim/mmu_radix.c
==============================================================================
--- head/sys/powerpc/aim/mmu_radix.c Wed May 27 23:20:35 2020
(r361567)
+++ head/sys/powerpc/aim/mmu_radix.c Thu May 28 00:49:02 2020
(r361568)
@@ -6000,7 +6000,8 @@ mmu_radix_kremove(vm_offset_t va)
int mmu_radix_map_user_ptr(pmap_t pm,
volatile const void *uaddr, void **kaddr, size_t ulen, size_t *klen)
{
- if ((uintptr_t)uaddr + ulen >= VM_MAXUSER_ADDRESS)
+ if ((uintptr_t)uaddr + ulen >= VM_MAXUSER_ADDRESS ||
+ (uintptr_t)uaddr + ulen < (uintptr_t)uaddr)
return (EFAULT);
*kaddr = (void *)(uintptr_t)uaddr;
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