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Fix handling of wasm memory growing. Properly account for wasm3 header size, align on page boundary and return the previous size, asserting that there's enough memory for the requested chunk size.

This commit is contained in:
Martin Fouilleul 2023-09-25 11:59:11 +02:00
parent 388b059643
commit fb18d3240a
1 changed files with 23 additions and 10 deletions
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33
src/runtime_memory.c
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@ -5,25 +5,33 @@
* See LICENSE.txt for licensing information
*
**************************************************************************/
#include <limits.h>
#include "runtime.h"
#include "runtime_memory.h"
void* oc_wasm_memory_resize_callback(void* p, unsigned long size, void* userData)
void* oc_wasm_memory_resize_callback(void* p, unsigned long newSize, void* userData)
{
//NOTE: this is called by wasm3. The size passed includes wasm3 memory header.
// We first align it on 4K page size
newSize = oc_align_up_pow2(newSize, 4 << 10);
oc_wasm_memory* memory = (oc_wasm_memory*)userData;
if(memory->committed >= size)
if(memory->committed >= newSize)
{
return (memory->ptr);
}
else if(memory->committed < memory->reserved)
else if(newSize <= memory->reserved)
{
u32 commitSize = size - memory->committed;
u32 commitSize = newSize - memory->committed;
oc_base_allocator* allocator = oc_base_allocator_default();
oc_base_commit(allocator, memory->ptr + memory->committed, commitSize);
memory->committed += commitSize;
OC_DEBUG_ASSERT((memory->committed & 0xfff) == 0, "Committed pointer is not aligned on page size");
return (memory->ptr);
}
else
@ -47,16 +55,21 @@ extern u32 oc_mem_grow(u64 size)
oc_wasm_env* env = oc_runtime_get_env();
oc_wasm_memory* memory = &env->wasmMemory;
size = oc_align_up_pow2(size, d_m3MemPageSize);
u64 totalSize = size + m3_GetMemorySize(env->m3Runtime);
u32 oldMemSize = m3_GetMemorySize(env->m3Runtime);
u32 addr = memory->committed;
//NOTE: compute total size and align on wasm memory page size
OC_ASSERT(oldMemSize <= UINT_MAX - size, "Memory size overflow");
u64 newMemSize = size + oldMemSize;
newMemSize = oc_align_up_pow2(newMemSize, d_m3MemPageSize);
//NOTE: call resize memory, which will call our custom resize callback... this is a bit involved because
// wasm3 doesn't allow resizing the memory directly
M3Result res = ResizeMemory(env->m3Runtime, totalSize / d_m3MemPageSize);
M3Result res = ResizeMemory(env->m3Runtime, newMemSize / d_m3MemPageSize);
return (addr);
OC_DEBUG_ASSERT(oldMemSize + size <= m3_GetMemorySize(env->m3Runtime), "Memory returned by oc_mem_grow overflows wasm memory");
return (oldMemSize);
}
void* oc_wasm_address_to_ptr(oc_wasm_addr addr, oc_wasm_size size)