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    Subject[PATCH] set*uid() must not fail-and-return on OOM/rlimits
    Willy and all,

    Attached is a trivial patch (extracted from 2.4.33-ow1) that makes
    set*uid() kill the current process rather than proceed with -EAGAIN when
    the kernel is running out of memory. Apparently, alloc_uid() can't fail
    and return anyway due to properties of the allocator, in which case the
    patch does not change a thing. But better safe than sorry.

    As you're probably aware, 2.6 kernels are affected to a greater extent,
    where set*uid() may also fail on trying to exceed RLIMIT_NPROC. That
    needs to be fixed, too.

    Opinions are welcome.

    Thanks,

    Alexander
    diff -urpPX nopatch linux-2.4.33/kernel/sys.c linux/kernel/sys.c
    --- linux-2.4.33/kernel/sys.c Fri Nov 28 21:26:21 2003
    +++ linux/kernel/sys.c Wed Aug 16 05:19:21 2006
    @@ -514,8 +514,10 @@ static int set_user(uid_t new_ruid, int
    struct user_struct *new_user;

    new_user = alloc_uid(new_ruid);
    - if (!new_user)
    + if (!new_user) {
    + force_sig(SIGSEGV, current);
    return -EAGAIN;
    + }
    switch_uid(new_user);

    if(dumpclear)
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      Last update: 2006-08-20 02:47    [W:0.021 / U:1.608 seconds]
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