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    SubjectRe: Is PIE randomization breaking klibc binaries?
    On 07/24/2007 04:34 PM, Chuck Ebbert wrote:
    > On 07/20/2007 06:05 PM, H. Peter Anvin wrote:
    >>> It looks like that the PIE randomization patch breaks klibc
    >>> binaries on x86-64.
    >> Interesting.
    >> klibc binaries are indeed statically linked, but composed of two
    >> different ELF images: the application itself and the shared libary
    >> (which is referenced from the application header as the "interpreter").
    >> Neither of these is an ET_DYN file; they are both ET_EXEC, so it
    >> *should* be unaffected by the PIE randomization patch. Obviously, that
    >> seems to not be the case.
    >> My guess is that this patch mishandles interpreter images which are
    >> ET_EXEC. Jan, any insight?
    > Well, they don't run on Fedora 6 either (which has the same code, it's
    > part of exec-shield):
    > $ strace ./cat
    > execve("./cat", ["./cat"], [/* 55 vars */]) = -1 ENOENT (No such file or directory)
    > ...
    > $ file cat
    > cat: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked (uses shared libs), stripped
    > Funny nobody noticed that before...

    After installing and klibc-<ID>.so into /lib everything works:

    Program Headers:
    Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
    PHDR 0x000034 0x08048034 0x08048034 0x0000a0 0x0000a0 R E 0x4
    INTERP 0x0000d4 0x080480d4 0x080480d4 0x00002a 0x00002a R 0x1
    [Requesting program interpreter: /lib/]

    Ulrich, did your initrd contain the correct .so? Did you try rebuilding klibc after
    building the new kernel?
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      Last update: 2007-07-24 23:01    [W:0.022 / U:0.384 seconds]
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