File qtwebengine-glibc_2.41.patch of Package qt6-webengine

From ff80fa1278ecfa00eec37fbeba393e33a69ca9a5 Mon Sep 17 00:00:00 2001
From: Kaloyan Chehlarski <kaloyan.chehlarski@qt.io>
Date: Thu, 13 Mar 2025 11:43:29 +0100
Subject: Allow MAP_DROPPABLE memory mappings in Linux sandbox

Linux 6.11 has getrandom() as virtual dynamic shared object and glibc-2.41 adds support for it. In case of vsdo
implementation kernel will call mmap with MAP_DROPPABLE flag
which is restricted by chromium sandbox, causing render
process to fail. Allow new mmap flag in the sandbox.

Fixes: QTBUG-134631
Pick-to: 122-based 87-based
Change-Id: I4f303af85ac873222e768fe7139873774d51b022
Reviewed-on: https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/631348
Reviewed-by: Kaloyan Chehlarski <kaloyan.chehlarski@qt.io>
Reviewed-by: Michal Klocek <michal.klocek@qt.io>
---
 .../linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc    | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc b/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
index bb0e13f4d2d..675a8a5e257 100644
--- a/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
+++ b/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
@@ -35,6 +35,10 @@
 #include "sandbox/linux/system_headers/linux_syscalls.h"
 #include "sandbox/linux/system_headers/linux_time.h"
 
+#if !defined(MAP_DROPPABLE)
+#define MAP_DROPPABLE	0x08    // Zero memory under memory pressure.
+#endif
+
 #if (BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)) && \
     !defined(__arm__) && !defined(__aarch64__) &&             \
     !defined(PTRACE_GET_THREAD_AREA)
@@ -238,7 +242,7 @@ ResultExpr RestrictMmapFlags() {
   // TODO(davidung), remove MAP_DENYWRITE with updated Tegra libraries.
   const uint64_t kAllowedMask = MAP_SHARED | MAP_PRIVATE | MAP_ANONYMOUS |
                                 MAP_STACK | MAP_NORESERVE | MAP_FIXED |
-                                MAP_DENYWRITE | MAP_LOCKED |
+                                MAP_DENYWRITE | MAP_LOCKED | MAP_DROPPABLE |
                                 kArchSpecificAllowedMask;
   const Arg<int> flags(3);
   return If((flags & ~kAllowedMask) == 0, Allow()).Else(CrashSIGSYS());
-- 
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