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SubjectRe: [PATCH] coredump - as root not only if euid switched

On Thursday, April 22, 2004, at 09:53PM, Chris Wright <chrisw@osdl.org> wrote:

>* Peter W�chtler (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,

please
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