benh at kernel.crashing.org
Sat Apr 18 03:04:39 EST 2009
> On ppc32 personality is clearly set to 0. On ppc64 the
> elf_read_implies_exec does work around the issue (ie I implemented
> elf_read_implies_exec as (exec_stk != EXSTACK_DISABLE_X) on ppc32).
> However I think its just masking it.
How so ? IE, it checks for PT_GNU_STACK, if not present, it then
sets read to imply exec. Things compiled with a fixed toolchain
have that no ?
> Hear are the PHDRs for the version of init I'm running:
> Program Headers:
> Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg
> PHDR 0x000034 0x10000034 0x10000034 0x000e0 0x000e0 R E 0x4
> INTERP 0x000114 0x10000114 0x10000114 0x0000d 0x0000d R 0x1
> [Requesting program interpreter: /lib/ld.so.1]
> LOAD 0x000000 0x10000000 0x10000000 0x072a0 0x072a0 R E
> LOAD 0x0072a0 0x100172a0 0x100172a0 0x00358 0x00988 RW
> DYNAMIC 0x0074bc 0x100174bc 0x100174bc 0x000c8 0x000c8 RW 0x4
> NOTE 0x000130 0x10000130 0x10000130 0x00020 0x00020 R
> I don't think elf_read_implies_exec() is the right solution on ppc32.
> As I asked before, can VM_MAYEXEC be of any use to us?
> - k
More information about the Linuxppc-dev