Messages in this thread | | | Date | Fri, 9 Jan 2004 15:15:36 +1100 | From | Anton Blanchard <> | Subject | Re: [PATCH][RFC] invalid ELF binaries can execute - better sanity checking |
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> I've always had little confidence in the elf loader. The problem is > complex, the code quality is not high and the consequences of an error are > severe.
One thing I noticed is that we only obey execute permission on load sections. On ppc32 the PLT is in the bss area and must be executable:
[27] .sbss PROGBITS 100ba10c 0aa10c 000a14 00 WA 0 0 8 [28] .plt PROGBITS 100bab20 0aab20 000834 00 WAX 0 0 4 [29] .bss NOBITS 100bb358 0ab354 003f90 00 WA 0 0 8
When I did per page execute for ppc64 we fell apart because the current elf loader just creates a single region of non executable memory regardless of what the binary asks for.
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