File firefox-glibc-dynstack.patch of Package firefox78

Index: b/js/xpconnect/src/XPCJSContext.cpp
===================================================================
--- a/js/xpconnect/src/XPCJSContext.cpp
+++ b/js/xpconnect/src/XPCJSContext.cpp
@@ -81,14 +81,6 @@ using namespace xpc;
 using namespace JS;
 using mozilla::dom::AutoEntryScript;
 
-// The watchdog thread loop is pretty trivial, and should not require much stack
-// space to do its job. So only give it 32KiB or the platform minimum.
-#if !defined(PTHREAD_STACK_MIN)
-#  define PTHREAD_STACK_MIN 0
-#endif
-static constexpr size_t kWatchdogStackSize =
-    PTHREAD_STACK_MIN < 32 * 1024 ? 32 * 1024 : PTHREAD_STACK_MIN;
-
 static void WatchdogMain(void* arg);
 class Watchdog;
 class WatchdogManager;
@@ -161,7 +153,7 @@ class Watchdog {
       // watchdog, we need to join it on shutdown.
       mThread = PR_CreateThread(PR_USER_THREAD, WatchdogMain, this,
                                 PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD,
-                                PR_JOINABLE_THREAD, kWatchdogStackSize);
+                                PR_JOINABLE_THREAD, 0);
       if (!mThread) {
         MOZ_CRASH("PR_CreateThread failed!");
       }
Index: b/security/sandbox/linux/launch/SandboxLaunch.cpp
===================================================================
--- a/security/sandbox/linux/launch/SandboxLaunch.cpp
+++ b/security/sandbox/linux/launch/SandboxLaunch.cpp
@@ -489,7 +489,7 @@ static int CloneCallee(void* aPtr) {
 // we don't currently support sandboxing under valgrind.
 MOZ_NEVER_INLINE MOZ_ASAN_BLACKLIST static pid_t DoClone(int aFlags,
                                                          jmp_buf* aCtx) {
-  uint8_t miniStack[PTHREAD_STACK_MIN];
+  uint8_t miniStack[4096] __attribute__((aligned(16)));
 #ifdef __hppa__
   void* stackPtr = miniStack;
 #else
@@ -510,13 +510,19 @@ static pid_t ForkWithFlags(int aFlags) {
                                CLONE_CHILD_CLEARTID;
   MOZ_RELEASE_ASSERT((aFlags & kBadFlags) == 0);
 
+  // Block signals due to small stack in DoClone.
+  sigset_t oldSigs;
+  BlockAllSignals(&oldSigs);
+
+  int ret = 0;
   jmp_buf ctx;
   if (setjmp(ctx) == 0) {
     // In the parent and just called setjmp:
-    return DoClone(aFlags | SIGCHLD, &ctx);
+    ret = DoClone(aFlags | SIGCHLD, &ctx);
   }
+  RestoreSignals(&oldSigs);
   // In the child and have longjmp'ed:
-  return 0;
+  return ret;
 }
 
 static bool WriteStringToFile(const char* aPath, const char* aStr,
Index: b/toolkit/crashreporter/breakpad-client/linux/handler/exception_handler.cc
===================================================================
--- a/toolkit/crashreporter/breakpad-client/linux/handler/exception_handler.cc
+++ b/toolkit/crashreporter/breakpad-client/linux/handler/exception_handler.cc
@@ -145,7 +145,7 @@ void InstallAlternateStackLocked() {
   // SIGSTKSZ may be too small to prevent the signal handlers from overrunning
   // the alternative stack. Ensure that the size of the alternative stack is
   // large enough.
-  static const unsigned kSigStackSize = std::max(16384, SIGSTKSZ);
+static const unsigned kSigStackSize = std::max(16384, (int) SIGSTKSZ);
 
   // Only set an alternative stack if there isn't already one, or if the current
   // one is too small.