using gcc-3.4.6 and building a PIE binary with -z relro results in an ELF that,
when stripped, causes the PT_GNU_RELRO to shrink the memsize more than the
filesize ... perhaps this is a dupe of Bug 3281 ...
$ gcc-3.4.6 dumpelf.c -o dumpelf -fPIE -Wl,-z,relro
$ readelf -Wl dumpelf | grep GNU_REL
GNU_RELRO 0x007d50 0x00607d50 0x00607d50 0x0002b0 0x0002b0 R 0x1
$ strip dumpelf
$ readelf -Wl dumpelf | grep GNU_REL
GNU_RELRO 0x007d50 0x00607d50 0x00607d50 0x000288 0x000280 R 0x1
the filesize (0x288) is larger than the memsize (0x280)
looking at the relevant section headers:
[17] .ctors PROGBITS 00607d50 007d50 000010 00 WA 0 0 8
[18] .dtors PROGBITS 00607d60 007d60 000010 00 WA 0 0 8
[19] .jcr PROGBITS 00607d70 007d70 000008 00 WA 0 0 8
[20] .data.rel.ro PROGBITS 00607d80 007d80 0000a0 00 WA 0 0 32
[21] .dynamic DYNAMIC 00607e20 007e20 000190 10 WA 5 0 8
[22] .got PROGBITS 00607fb0 007fb0 000028 08 WA 0 0 8
we see the filesize of the PT is correct (0x7d50 + 0x288 covers all these
sections) but the memsize of the PT does not include the last few entries of the
.got (0x7d50 + 0x280 is 0x8 bytes short of the end of the .got)
--
Summary: strip shrinks PT_GNU_RELRO on PIE objects
Product: binutils
Version: 2.18
Status: NEW
Severity: normal
Priority: P2
Component: binutils
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: vapier at gentoo dot org
CC: bug-binutils at gnu dot org
GCC host triplet: x86_64-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=5037
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