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Use a QVarLengthArray for FatalSignalHandler's alternate stack

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The stack needs to be at least SIGSTKSZ, which isn't constexpr, so we
can't allocate it at compile time. However, we can resize(SIGSTKSZ) a
QVarLengthArray that's probably big enough anyway. At the same time,
increase the compile-time size to 32k, to match what our Catch2
harness for the self-test uses.

Change-Id: I3a34ece73901dd402672cd6fe4da66923f1932c8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Edward Welbourne 2021-11-16 19:26:05 +01:00
parent 2ad5fd36fb
commit 4515c5e4fc
1 changed files with 4 additions and 3 deletions
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7
src/testlib/qtestcase.cpp
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@ -1691,11 +1691,12 @@ public:
// interfere with normal .bss symbols
__attribute__((section(".lbss.altstack"), aligned(4096)))
# endif
static char alternate_stack[16 * 1024];
static QVarLengthArray<char, 32 * 1024> alternateStack;
alternateStack.resize(qMax(SIGSTKSZ, alternateStack.size()));
stack_t stack;
stack.ss_flags = 0;
stack.ss_size = sizeof alternate_stack;
stack.ss_sp = alternate_stack;
stack.ss_size = alternateStack.size();
stack.ss_sp = alternateStack.data();
sigaltstack(&stack, nullptr);
act.sa_flags |= SA_ONSTACK;
# endif