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    SubjectRe: [PATCH] coredump - as root not only if euid switched
    * Peter Wächtler (pwaechtler@mac.com) wrote:
    > Am Do, 2004-04-22 um 11.56 schrieb Andrew Morton:
    > > Peter Waechtler <pwaechtler@mac.com> wrote:
    > > >
    > > > >(why are you trying to unlink the old file anyway?)
    > > > >
    > > >
    > > > For security measure :O
    > > > I tried on solaris: touch the core file as user, open it and wait, dump core
    > > > as root -> nope, couldn't read the damn core - it was unlinked and created!
    > >
    > > hm, OK. There's a window in which someone can come in and recreate the
    > > file, but the open is using O_EXCL|O_CREATE so that seems safe enough.
    >
    > So here is the updated patch with an open coded call to sys_unlink

    This patch breaks various ptrace() checks.

    thanks,
    -chris
    --
    Linux Security Modules http://lsm.immunix.org http://lsm.bkbits.net
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