[lkml]   [2007]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: Is PIE randomization breaking klibc binaries?
    On 07-07-24 16:57 Chuck Ebbert wrote:

    > > $ strace ./cat
    > > execve("./cat", ["./cat"], [/* 55 vars */]) = -1 ENOENT (No such file or directory)
    > > ...

    Chuck, my binaries run always into a segmentation violation. So
    ENOENT is not the issue. (Notify it was on an x86-64.)

    > > $ 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/]

    Yes, these files were present in the initrd.img file. I checked it
    by unpacking the initrd.img file. Notify also that I used
    git-bisect to identify the PIE patch. This requires successful
    builds. Reverting the patch clearly resolved the issue at the end.

    > Ulrich, did your initrd contain the correct .so?

    Sure! I have only one klibc-*.so on my box in /lib. I diffed the
    file in the unpacked initrd.img with the file in /lib and there
    has been no difference.

    I always recreate the initial ramdisk after the kernel rebuild
    with make install and my own installkernel script, which uses
    mkinitramfs. The mkinitramfs script ensures that the klibc so
    object from /lib and the klibc binaries from /usr/lib/klibc/bin
    are copied into the initrd image. Usually that works without any
    issue on x86, x86-64. PPC can't use make install, but I use
    mkinitramfs there too, which handles klibc the same way.

    > Did you try rebuilding klibc after building the new kernel?

    Rebuilding klibc doesn't make sense from my point of view. What
    should be the point of it?

    Uli Kunitz
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-07-25 00:03    [W:0.023 / U:30.264 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site