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Ensure stack size for POSIX signal handling is sufficient

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Until now, the stack size for POSIX signal handling was determined by
the implementation defined limit `STKSZ`, which in some cases turned out
to be insufficient, leading to stack overflow inside the signal handler.
The new size, which was determined experimentally, is the larger of 32kb
or `MINSTKSZ`.

Fixes #1225
This commit is contained in:
BiCapitalization 2018-05-27 18:12:40 +02:00 committed by Martin Hořeňovský
parent df0b0e64e1
commit 88d7b8da25
1 changed files with 7 additions and 2 deletions
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9
include/internal/catch_fatal_condition.cpp
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@ -94,6 +94,11 @@ namespace Catch {
int id; int id;
const char* name; const char* name;
}; };
// 32kb for the alternate stack seems to be sufficient. However, this value
// is experimentally determined, so that's not guaranteed.
constexpr static std::size_t sigStackSize = 32768 >= MINSIGSTKSZ ? 32768 : MINSIGSTKSZ;
static SignalDefs signalDefs[] = { static SignalDefs signalDefs[] = {
{ SIGINT, "SIGINT - Terminal interrupt signal" }, { SIGINT, "SIGINT - Terminal interrupt signal" },
{ SIGILL, "SIGILL - Illegal instruction signal" }, { SIGILL, "SIGILL - Illegal instruction signal" },
@ -121,7 +126,7 @@ namespace Catch {
isSet = true; isSet = true;
stack_t sigStack; stack_t sigStack;
sigStack.ss_sp = altStackMem; sigStack.ss_sp = altStackMem;
sigStack.ss_size = SIGSTKSZ; sigStack.ss_size = sigStackSize;
sigStack.ss_flags = 0; sigStack.ss_flags = 0;
sigaltstack(&sigStack, &oldSigStack); sigaltstack(&sigStack, &oldSigStack);
struct sigaction sa = { }; struct sigaction sa = { };
@ -153,7 +158,7 @@ namespace Catch {
bool FatalConditionHandler::isSet = false; bool FatalConditionHandler::isSet = false;
struct sigaction FatalConditionHandler::oldSigActions[sizeof(signalDefs)/sizeof(SignalDefs)] = {}; struct sigaction FatalConditionHandler::oldSigActions[sizeof(signalDefs)/sizeof(SignalDefs)] = {};
stack_t FatalConditionHandler::oldSigStack = {}; stack_t FatalConditionHandler::oldSigStack = {};
char FatalConditionHandler::altStackMem[SIGSTKSZ] = {}; char FatalConditionHandler::altStackMem[sigStackSize] = {};
} // namespace Catch } // namespace Catch