This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] mprotect segments with extra PROT_WRITE bit when DT_TEXTREL bit is set


On 08/23/2018 07:52 AM, Fangrui Song wrote:

     * elf/dl-reloc.c (_dl_relocate_object): __mprotect with extra
     PROT_WRITE bit.

This needs a bug in Bugzilla (is it bug 20480?), reference in the ChangeLog entry, and, ideally, a regression test.

I can see that the current code has a problem, but I assume we do things this way because we want to create an RWX mapping, even temporarily. System security policy may prevent the creation of such mappings. We would have have to flip between RW and RWX protection flags around IFUNC handlers to fix that.

Thanks,
Florian


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]