Re: Should this happen?

From: Albert Cranford (ac9410@bellsouth.net)
Date: Fri May 05 2000 - 04:26:44 EDT

  • Next message: Andries Brouwer: "Re: devfs persistence"

    Manfred Spraul wrote:
    >
    > Wakko Warner wrote:
    > >
    > > > > Also sprach Craig Whitmore:
    > > > > } With 2.3.99-pre6 (haven't checked any other versions)
    > > > > }
    > > > > } [root@lennon /proc]# more misc
    > > > > } Segmentation fault
    > > > > } [root@lennon /proc]# cat misc
    > > > > } 175 agpgart
    > > > > } 63 tdfx
    > > > > } 1 psaux
    > > > > }
    > > > > } I don't think this should happen..
    > > > > }
    > > > > IMHO, probably not. But it does this in "stable" kernels as well ;-)
    > > > >
    >
    > Very simple&stupid bug:
    > try
    > strace dd if=/proc/misc bs=1
    >
    > read(fd,buf,1) returns more than 1 byte, thus it overruns a user space
    > buffer in more, and crashes. It won't oops.
    >
    > I've attached an untested patch, it should fix the bug in 2.2 & 2.3
    >
    > --
    > Manfred
    >
    > --------------------------------------------------------------------------------------------------------------------------------
    > Name: patch-misc
    > patch-misc Type: C Code (text/plain)
    > Encoding: 7bit

    Worked well for me in 2.3. Please forward patch to Linus.
    Later,
    Albert
    home1:/proc# cat misc
    144 nvram
    135 rtc
    130 watchdog
    134 apm_bios
    home1:/proc# more misc
    144 nvram
    135 rtc
    130 watchdog
    134 apm_bios
    home1:/proc# 

    -- 
Albert Cranford Deerfield Beach FL USA
ac9410@bellsouth.net

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