swiotlb: Convert io_default_tlb_mem to static allocation

Since commit 69031f500865 ("swiotlb: Set dev->dma_io_tlb_mem to the
swiotlb pool used"), 'struct device' may hold a copy of the global
'io_default_tlb_mem' pointer if the device is using swiotlb for DMA. A
subsequent call to swiotlb_exit() will therefore leave dangling pointers
behind in these device structures, resulting in KASAN splats such as:

  |  BUG: KASAN: use-after-free in __iommu_dma_unmap_swiotlb+0x64/0xb0
  |  Read of size 8 at addr ffff8881d7830000 by task swapper/0/0
  |
  |  CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc3-debug #1
  |  Hardware name: HP HP Desktop M01-F1xxx/87D6, BIOS F.12 12/17/2020
  |  Call Trace:
  |   <IRQ>
  |   dump_stack+0x9c/0xcf
  |   print_address_description.constprop.0+0x18/0x130
  |   kasan_report.cold+0x7f/0x111
  |   __iommu_dma_unmap_swiotlb+0x64/0xb0
  |   nvme_pci_complete_rq+0x73/0x130
  |   blk_complete_reqs+0x6f/0x80
  |   __do_softirq+0xfc/0x3be

Convert 'io_default_tlb_mem' to a static structure, so that the
per-device pointers remain valid after swiotlb_exit() has been invoked.
All users are updated to reference the static structure directly, using
the 'nslabs' field to determine whether swiotlb has been initialised.
The 'slots' array is still allocated dynamically and referenced via a
pointer rather than a flexible array member.

Cc: Claire Chang <tientzu@chromium.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Fixes: 69031f500865 ("swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Claire Chang <tientzu@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>

1 files changed, 36 insertions, 30 deletions

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index f1a9ae7fad8f..7948f274f9bb 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -70,7 +70,7 @@
 
 enum swiotlb_force swiotlb_force;
 
-struct io_tlb_mem *io_tlb_default_mem;
+struct io_tlb_mem io_tlb_default_mem;
 
 /*
  * Max segment that we can provide which (if pages are contingous) will
@@ -101,7 +101,7 @@ early_param("swiotlb", setup_io_tlb_npages);
 
 unsigned int swiotlb_max_segment(void)
 {
-	return io_tlb_default_mem ? max_segment : 0;
+	return io_tlb_default_mem.nslabs ? max_segment : 0;
 }
 EXPORT_SYMBOL_GPL(swiotlb_max_segment);
 
@@ -134,9 +134,9 @@ void __init swiotlb_adjust_size(unsigned long size)
 
 void swiotlb_print_info(void)
 {
-	struct io_tlb_mem *mem = io_tlb_default_mem;
+	struct io_tlb_mem *mem = &io_tlb_default_mem;
 
-	if (!mem) {
+	if (!mem->nslabs) {
 		pr_warn("No low mem\n");
 		return;
 	}
@@ -163,11 +163,11 @@ static inline unsigned long nr_slots(u64 val)
  */
 void __init swiotlb_update_mem_attributes(void)
 {
-	struct io_tlb_mem *mem = io_tlb_default_mem;
+	struct io_tlb_mem *mem = &io_tlb_default_mem;
 	void *vaddr;
 	unsigned long bytes;
 
-	if (!mem || mem->late_alloc)
+	if (!mem->nslabs || mem->late_alloc)
 		return;
 	vaddr = phys_to_virt(mem->start);
 	bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
@@ -201,25 +201,24 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
 
 int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 {
-	struct io_tlb_mem *mem;
+	struct io_tlb_mem *mem = &io_tlb_default_mem;
 	size_t alloc_size;
 
 	if (swiotlb_force == SWIOTLB_NO_FORCE)
 		return 0;
 
 	/* protect against double initialization */
-	if (WARN_ON_ONCE(io_tlb_default_mem))
+	if (WARN_ON_ONCE(mem->nslabs))
 		return -ENOMEM;
 
-	alloc_size = PAGE_ALIGN(struct_size(mem, slots, nslabs));
-	mem = memblock_alloc(alloc_size, PAGE_SIZE);
-	if (!mem)
+	alloc_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), nslabs));
+	mem->slots = memblock_alloc(alloc_size, PAGE_SIZE);
+	if (!mem->slots)
 		panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
 		      __func__, alloc_size, PAGE_SIZE);
 
 	swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
 
-	io_tlb_default_mem = mem;
 	if (verbose)
 		swiotlb_print_info();
 	swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
@@ -304,26 +303,24 @@ swiotlb_late_init_with_default_size(size_t default_size)
 int
 swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 {
-	struct io_tlb_mem *mem;
+	struct io_tlb_mem *mem = &io_tlb_default_mem;
 	unsigned long bytes = nslabs << IO_TLB_SHIFT;
 
 	if (swiotlb_force == SWIOTLB_NO_FORCE)
 		return 0;
 
 	/* protect against double initialization */
-	if (WARN_ON_ONCE(io_tlb_default_mem))
+	if (WARN_ON_ONCE(mem->nslabs))
 		return -ENOMEM;
 
-	mem = (void *)__get_free_pages(GFP_KERNEL,
-		get_order(struct_size(mem, slots, nslabs)));
-	if (!mem)
+	mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+		get_order(array_size(sizeof(*mem->slots), nslabs)));
+	if (!mem->slots)
 		return -ENOMEM;
 
-	memset(mem, 0, sizeof(*mem));
 	set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
 	swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
 
-	io_tlb_default_mem = mem;
 	swiotlb_print_info();
 	swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
 	return 0;
@@ -331,18 +328,18 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 
 void __init swiotlb_exit(void)
 {
-	struct io_tlb_mem *mem = io_tlb_default_mem;
 	size_t size;
+	struct io_tlb_mem *mem = &io_tlb_default_mem;
 
-	if (!mem)
+	if (!mem->nslabs)
 		return;
 
-	size = struct_size(mem, slots, mem->nslabs);
+	size = array_size(sizeof(*mem->slots), mem->nslabs);
 	if (mem->late_alloc)
-		free_pages((unsigned long)mem, get_order(size));
+		free_pages((unsigned long)mem->slots, get_order(size));
 	else
-		memblock_free_late(__pa(mem), PAGE_ALIGN(size));
-	io_tlb_default_mem = NULL;
+		memblock_free_late(__pa(mem->slots), PAGE_ALIGN(size));
+	memset(mem, 0, sizeof(*mem));
 }
 
 /*
@@ -696,7 +693,9 @@ size_t swiotlb_max_mapping_size(struct device *dev)
 
 bool is_swiotlb_active(struct device *dev)
 {
-	return dev->dma_io_tlb_mem != NULL;
+	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+
+	return mem && mem->nslabs;
 }
 EXPORT_SYMBOL_GPL(is_swiotlb_active);
 
@@ -711,10 +710,10 @@ static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem)
 
 static int __init swiotlb_create_default_debugfs(void)
 {
-	struct io_tlb_mem *mem = io_tlb_default_mem;
+	struct io_tlb_mem *mem = &io_tlb_default_mem;
 
 	debugfs_dir = debugfs_create_dir("swiotlb", NULL);
-	if (mem) {
+	if (mem->nslabs) {
 		mem->debugfs = debugfs_dir;
 		swiotlb_create_debugfs_files(mem);
 	}
@@ -783,10 +782,17 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
 	 * to it.
 	 */
 	if (!mem) {
-		mem = kzalloc(struct_size(mem, slots, nslabs), GFP_KERNEL);
+		mem = kzalloc(sizeof(*mem), GFP_KERNEL);
 		if (!mem)
 			return -ENOMEM;
 
+		mem->slots = kzalloc(array_size(sizeof(*mem->slots), nslabs),
+				     GFP_KERNEL);
+		if (!mem->slots) {
+			kfree(mem);
+			return -ENOMEM;
+		}
+
 		set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
 				     rmem->size >> PAGE_SHIFT);
 		swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, false);
@@ -806,7 +812,7 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
 static void rmem_swiotlb_device_release(struct reserved_mem *rmem,
 					struct device *dev)
 {
-	dev->dma_io_tlb_mem = io_tlb_default_mem;
+	dev->dma_io_tlb_mem = &io_tlb_default_mem;
 }
 
 static const struct reserved_mem_ops rmem_swiotlb_ops = {