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author | Nick Alcock <nick.alcock@oracle.com> | 2016-12-26 10:08:51 +0100 |
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committer | Florian Weimer <fweimer@redhat.com> | 2016-12-26 10:08:51 +0100 |
commit | bc174f20b83d19167ecac14ce0762eddbe47cc64 (patch) | |
tree | 0e04ae0e0507b28d468f24e9110ce4880bed2617 /manual/pattern.texi | |
parent | 995635f95b707488c23bba07be8016c9682d4045 (diff) | |
download | glibc-bc174f20b83d19167ecac14ce0762eddbe47cc64.tar.gz glibc-bc174f20b83d19167ecac14ce0762eddbe47cc64.tar.xz glibc-bc174f20b83d19167ecac14ce0762eddbe47cc64.zip |
Ignore __stack_chk_fail* in the rtld mapfile computation [BZ #7065]
The previous commit prevented rtld itself from being built with -fstack-protector, but this is not quite enough. We identify which objects belong in rtld via a test link and analysis of the resulting mapfile. That link is necessarily done against objects that are stack-protected, so drags in __stack_chk_fail_local, __stack_chk_fail, and all the libc and libio code they use. To stop this happening, use --defsym in the test librtld.map-production link to force the linker to predefine these two symbols (to 0, but it could be to anything). (In a real link, this would of course be catastrophic, but these object files are never used for anything else.)
Diffstat (limited to 'manual/pattern.texi')
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