kmem: Add KASAN state transitions
Memory allocated with kmem_* is unmapped upon free, so KASAN doesn't provide a lot of benefit, but since allocations are always a multiple of the page size we can create a redzone when the allocation request size is not a multiple of the page size. MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29458
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@ -71,12 +71,13 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h> /* for ticks and hz */
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#include <sys/asan.h>
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#include <sys/domainset.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/vmem.h>
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@ -220,25 +221,26 @@ kmem_alloc_attr_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
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vm_object_t object;
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vm_offset_t addr, i, offset;
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vm_page_t m;
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vm_size_t asize;
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int pflags;
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vm_prot_t prot;
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object = kernel_object;
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size = round_page(size);
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asize = round_page(size);
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vmem = vm_dom[domain].vmd_kernel_arena;
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if (vmem_alloc(vmem, size, M_BESTFIT | flags, &addr))
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if (vmem_alloc(vmem, asize, M_BESTFIT | flags, &addr))
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return (0);
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offset = addr - VM_MIN_KERNEL_ADDRESS;
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pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
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prot = (flags & M_EXEC) != 0 ? VM_PROT_ALL : VM_PROT_RW;
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VM_OBJECT_WLOCK(object);
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for (i = 0; i < size; i += PAGE_SIZE) {
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for (i = 0; i < asize; i += PAGE_SIZE) {
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m = kmem_alloc_contig_pages(object, atop(offset + i),
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domain, pflags, 1, low, high, PAGE_SIZE, 0, memattr);
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if (m == NULL) {
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VM_OBJECT_WUNLOCK(object);
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kmem_unback(object, addr, i);
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vmem_free(vmem, addr, size);
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vmem_free(vmem, addr, asize);
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return (0);
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}
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KASSERT(vm_page_domain(m) == domain,
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@ -251,6 +253,7 @@ kmem_alloc_attr_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
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prot | PMAP_ENTER_WIRED, 0);
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}
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VM_OBJECT_WUNLOCK(object);
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kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
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return (addr);
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}
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@ -299,23 +302,24 @@ kmem_alloc_contig_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
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vm_object_t object;
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vm_offset_t addr, offset, tmp;
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vm_page_t end_m, m;
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vm_size_t asize;
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u_long npages;
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int pflags;
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object = kernel_object;
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size = round_page(size);
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asize = round_page(size);
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vmem = vm_dom[domain].vmd_kernel_arena;
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if (vmem_alloc(vmem, size, flags | M_BESTFIT, &addr))
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if (vmem_alloc(vmem, asize, flags | M_BESTFIT, &addr))
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return (0);
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offset = addr - VM_MIN_KERNEL_ADDRESS;
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pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
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npages = atop(size);
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npages = atop(asize);
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VM_OBJECT_WLOCK(object);
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m = kmem_alloc_contig_pages(object, atop(offset), domain,
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pflags, npages, low, high, alignment, boundary, memattr);
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if (m == NULL) {
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VM_OBJECT_WUNLOCK(object);
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vmem_free(vmem, addr, size);
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vmem_free(vmem, addr, asize);
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return (0);
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}
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KASSERT(vm_page_domain(m) == domain,
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@ -332,6 +336,7 @@ kmem_alloc_contig_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
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tmp += PAGE_SIZE;
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}
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VM_OBJECT_WUNLOCK(object);
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kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
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return (addr);
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}
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@ -407,21 +412,23 @@ kmem_malloc_domain(int domain, vm_size_t size, int flags)
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{
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vmem_t *arena;
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vm_offset_t addr;
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vm_size_t asize;
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int rv;
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if (__predict_true((flags & M_EXEC) == 0))
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arena = vm_dom[domain].vmd_kernel_arena;
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else
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arena = vm_dom[domain].vmd_kernel_rwx_arena;
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size = round_page(size);
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if (vmem_alloc(arena, size, flags | M_BESTFIT, &addr))
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asize = round_page(size);
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if (vmem_alloc(arena, asize, flags | M_BESTFIT, &addr))
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return (0);
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rv = kmem_back_domain(domain, kernel_object, addr, size, flags);
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rv = kmem_back_domain(domain, kernel_object, addr, asize, flags);
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if (rv != KERN_SUCCESS) {
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vmem_free(arena, addr, size);
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vmem_free(arena, addr, asize);
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return (0);
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}
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kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
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return (addr);
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}
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@ -613,6 +620,7 @@ kmem_free(vm_offset_t addr, vm_size_t size)
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struct vmem *arena;
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size = round_page(size);
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kasan_mark((void *)addr, size, size, 0);
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arena = _kmem_unback(kernel_object, addr, size);
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if (arena != NULL)
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vmem_free(arena, addr, size);
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