Adhemerval Zanella ed6a68bac7 debug: Improve '%n' fortify detection (BZ 30932) ... The 7bb8045ec0 path made the '%n' fortify check ignore EMFILE errors while trying to open /proc/self/maps, and this added a security issue where EMFILE can be attacker-controlled thus making it ineffective for some cases. The EMFILE failure is reinstated but with a different error message. Also, to improve the false positive of the hardening for the cases where no new files can be opened, the _dl_readonly_area now uses _dl_find_object to check if the memory area is within a writable ELF segment. The procfs method is still used as fallback. Checked on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: Arjun Shankar <arjun@redhat.com>		2025-03-21 15:46:48 -03:00
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linux	debug: Improve '%n' fortify detection (BZ 30932)	2025-03-21 15:46:48 -03:00