Libre Office double mmaps a temporary file to build trampolines block. It attempts to create the temporary file in $HOME, and fallbacks on /tmp: bridges/source/cpp_uno/shared/vtablefactory.cxx 236 #ifdef USE_DOUBLE_MMAP 237 bool VtableFactory::createBlock(Block &block, sal_Int32 slotCount) const But $HOME is more likely to be noexec, so it is better to try /tmp first. Using $HOME first can also create annoying complains in LSM such as SELinux or AppArmor. As an example, libffi tries the following directories, in this order, until it finds something suitable: 1. $TMPDIR, 2. /tmp, 3. /var/tmp, 4. /dev/shm, 5. $HOME, 6. whatever is listed in /etc/mtab, 7. whatever is listed in /proc/mounts See https://github.com/atgreen/libffi/blob/master/src/closures.c#L382
T'was Caolan who first told me of the existence of this magic =)
I just used /home falling back to /tmp because Ulrich indicated that the temp dirs were more likely to have noexec set (http://www.akkadia.org/drepper/selinux-mem.html) Should be fairly easy to adapt the code to look in more places and reorder the places it checks, I've no problem with applying any patch that does that. Not on my own current radar to do it though, so I'll set the easyhack flags
Migrating Whiteboard tags to Keywords: (easyHack, difficultyBeginner, skillCpp) [NinjaEdit]
note that the likelihood of actually executing the double-mmap code paths severely decreased with <http://cgit.freedesktop.org/libreoffice/core/commit/?id=8b9968a26265facaf5e761485d750ce9cedab3ab> "fdo#72755: Only use double mmap as fallback"
No code pointer
JanI is default CC for Easy Hacks (Add Jan; remove LibreOffice Dev List from CC) [NinjaEdit]
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