Messages in this thread | | | From | (Eric W. Biederman) | Date | Mon, 12 Nov 2012 18:16:03 -0800 | Subject | Re: [PATCH] fs/proc: Add process text segment md5-summing |
| |
Andrew Morton <akpm@linux-foundation.org> writes:
> On Mon, 12 Nov 2012 21:36:17 +0000 > Arvid Brodin <Arvid.Brodin@xdin.com> wrote: > >> Adds /proc/<pid>/text_md5sum which, when read, calculates an md5sum over >> the process' text segment. This can detect some cases where the system RAM >> has been disturbed by e.g. ESD or cosmic radiation (on systems where ECC >> is not available). It might also detect some accidental or malicious >> modifications of executables, where the perpetrator has not bothered to >> cover up the tracks. > > I thought the review comments regarding the earlier patch were rather > fatal, sorry.
To add another nail in the coffin.
You can do this with ptrace or with /proc/<pid>/mem without a kernel patch.
To make this safe would need a ptrace_may_acces(PTRACE_MODE_READ) permission check. At which point not doing this with ptrace just adds up to extra kernel maintenance for no real point.
Eric
| |