[lkml]   [1998]   [Dec]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: Linux 2.2.0pre2
    In article <>, (Linus Torvalds) writes:
    > - fix for an attack where you could cause a complete and utter lockup of
    > the kernel as a normal user. Thanks to Michael Chastain for keeping the
    > faith on this one and reminding me to fix it.

    This is harmless compared to the attacks possible with /proc/<pid>/mem @)
    All functions in fs/proc/mem.c are super-racy (the process/mm structure may
    go away while it sleeps) and have other problems. Also they are completely
    unreliable to use because they don't fault in pages. Alan's acX patches
    have a patch that fix most races, except a few problems in the mem_mmap()
    range checking. Fixing mmap completely is hard because doing it full may
    lead to shared anonymous mappings.

    These problems are in 2.0 too.

    > If you haven't had problems with pre1, there should be no major cause to
    > look at pre2. But if you haven't even looked at pre1 yet, please consider
    > looking at the pre-2.2.0 kernels before it's too late. I'm going to be
    > extremely rude to people who knew better but didn't test out the pre-
    > kernels and then send me bug-reports on the released 2.2.0.

    Out of memory handling seems to be poor in 2.2.0pre1. It gets into a strange
    swap storm that does not do full HD bandwidth swapping, but small bursts of
    IO with pauses.


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

     \ /
      Last update: 2005-03-22 13:46    [W:0.019 / U:9.160 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site