[lkml]   [2006]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] Add user taint flag
    On Mon, May 22, 2006 at 04:14:36PM +0200, Arjan van de Ven wrote:
    > On Sun, 2006-05-21 at 19:04 -0400, Theodore Ts'o wrote:
    > > Allow taint flags to be set from userspace by writing to
    > > /proc/sys/kernel/tainted, and add a new taint flag, TAINT_USER, to be
    > > used when userspace is potentially doing something naughty that might
    > > compromise the kernel.
    > we should then patch the /dev/mem driver or something to set this :)
    > (well and possibly give it an exception for now for PCI space until the
    > X people fix their stuff to use the proper sysfs stuff)

    It may make sense to have an explicit taint flag which means direct
    access to memory, via /dev/mem or otherwise, with exceptions for I/O
    mapped memory not claimed by a device driver (and of course X until it
    is fixed, or never, whichever comes first).

    As I've mentioned, the original reason why I did this was because I
    needed to mmap physical memory, which at the time when I originally
    did things, /dev/mem didn't support except for the I/O mapped memory
    range, and I assumed that any attempt to enhance /dev/mem's mmap()
    capabilities in a patch intended for mainline wouldn't be looked at as
    a friendly act. In fact, I was so unhappy about being forced by the
    RTSJ specification to do this insane thing that I wanted to make sure
    that if it were ever used, it would set a TAINT flag to warn people
    that just about anything unsane could have happened, and the system's
    stability was at the mercy of the competence of Java application
    programmers. :-)

    - Ted
    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: 2006-05-23 03:14    [W:0.021 / U:4.480 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site