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dbghelp: Prevent huge minidumps by ensuring the memory range is clamped.

This commit is contained in:
Eric van Beurden 2008-01-17 17:31:49 -05:00 committed by Alexandre Julliard
parent 692998292c
commit cb9596484d
1 changed files with 36 additions and 6 deletions
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42
dlls/dbghelp/minidump.c
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@ -119,20 +119,50 @@ static void fetch_thread_stack(struct dump_context* dc, const void* teb_addr,
{
#ifdef __i386__
/* limiting the stack dumping to the size actually used */
if (ctx->Esp)
mmd->StartOfMemoryRange = (ctx->Esp - 4);
if (ctx->Esp){
/* make sure ESP is within the established range of the stack. It could have
been clobbered by whatever caused the original exception. */
if (ctx->Esp - 4 < (ULONG_PTR)tib.StackLimit || ctx->Esp - 4 > (ULONG_PTR)tib.StackBase)
mmd->StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
else
mmd->StartOfMemoryRange = (ctx->Esp - 4);
}
else
mmd->StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
#elif defined(__powerpc__)
if (ctx->Iar)
mmd->StartOfMemoryRange = ctx->Iar - 4;
if (ctx->Iar){
/* make sure IAR is within the established range of the stack. It could have
been clobbered by whatever caused the original exception. */
if (ctx->Iar - 4 < (ULONG_PTR)tib.StackLimit || ctx->Iar - 4 > (ULONG_PTR)tib.StackBase)
mmd->StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
else
mmd->StartOfMemoryRange = (ctx->Iar - 4);
}
else
mmd->StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
#elif defined(__x86_64__)
if (ctx->Rsp)
mmd->StartOfMemoryRange = (ctx->Rsp - 8);
if (ctx->Rsp){
/* make sure RSP is within the established range of the stack. It could have
been clobbered by whatever caused the original exception. */
if (ctx->Rsp - 8 < (ULONG_PTR)tib.StackLimit || ctx->Rsp - 8 > (ULONG_PTR)tib.StackBase)
mmd->StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
else
mmd->StartOfMemoryRange = (ctx->Rsp - 8);
}
else
mmd->StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
#else
#error unsupported CPU
#endif