Arnd Bergmann wrote: > On Monday 09 July 2007, Scott Wood wrote: > >>In older versions of glibc (through 2.3), the dynamic linker executes a >>small amount of code from the data segment, which is not marked as >>executable. A recent change (commit 9ba4ace39fdfe22268daca9f28c5df384ae462cf) >>stops this from working; there should be a deprecation period before >>older glibc versions stop working. >> >>The problem has been observed on glibc 2.2. While glibc 2.3 has the same >>code, I did not see the problem; it may be that it accesses the page in >>question as data before executing from it, and thus it is already mapped. > > > I may be missing the obvious, but doesn't that defeat the purpose of > non-executable mappings?
The hardware in question doesn't support non-executable mappings; otherwise, it'd never have worked in the first place. Note that this is only allowed on 32-bit, non-book-E. There isn't much value in enforcing non-exec mappings only if it happens to be the first fault on a given page. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
