[PATCH] D20024: [ELF] - Protect first entries of got.plt with RelRo.

[George Rimar via llvm-commits]

grimar abandoned this revision.
grimar added a comment.

Well, I assumed it is useful, at least because even linkerscript has special command 
DATA_SEGMENT_RELRO_END to do that:

  .got            : { *(.got) *(.igot) }
  . = DATA_SEGMENT_RELRO_END (24, .);
  .got.plt        : { *(.got.plt)  *(.igot.plt) }

I don't know how realistic is attack using unprotected first 3 entries. 
Second and third are reserved for dynamic linker use and it is probably would be very specific attack.
So may be use of -zrelro & -znow is enough to protect (since whole .got.plt is covered by relro which is even more safe)
and also avoids additional code complexity.


http://reviews.llvm.org/D20024