================
@@ -288,8 +288,15 @@ Status ScriptedProcess::DoGetMemoryRegionInfo(lldb::addr_t
load_addr,
MemoryRegionInfo ®ion) {
Status error;
if (auto region_or_err =
- GetInterface().GetMemoryRegionContainingAddress(load_addr, error))
+ GetInterface().GetMemoryRegionContainingAddress(load_addr, error)) {
region = *region_or_err;
+ if (region.GetRange().GetRangeBase() == 0 &&
+ (region.GetRange().GetByteSize() == 0 ||
+ region.GetRange().GetByteSize() == LLDB_INVALID_ADDRESS)) {
----------------
labath wrote:
> We had a gdb stub returning {0, UINT64_MAX} the other week and it broke
> IRMemory::FindSpace() which will avoid any memory region with
> read/write/execute flags if qMemoryRegionInfo packets are supported. The stub
> claimed the entire address space, FindSpace() said it could not find any
> address range available, and all expressions broke.
Okay, but what's the alternative? Picking a piece of memory that may overlap
with some existing data? It sounds to me like the stub gets exactly what it
asked for.
> Yeah, a range of {0, 1} would result in algorithms like FindSpace() looping
> for a very long time, and be nearly as bad. But so far the two instances I've
> seen of people return bad ranges are {0,0} and {0,UINT64_MAX}.
True, but if we can change the expression to catch both, why not do it? What
I'm suggesting is to change the expression into something like `if
(GetRange().GetRangeBase() > addr || GetRange().GetRangeEnd() <= addr)`. The
`(0,0) case is subsumed by that, but this also catches any other incorrect
response.
https://github.com/llvm/llvm-project/pull/115963
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