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    SubjectRe: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    On 7/1/06, Arjan van de Ven <arjan@infradead.org> wrote:
    > On Sat, 2006-07-01 at 14:25 -0700, Miles Lane wrote:
    > > On 7/1/06, Arjan van de Ven <arjan@infradead.org> wrote:
    > > > On Sat, 2006-07-01 at 14:09 -0700, Miles Lane wrote:
    > > > > I am getting this:
    > > > >
    > > > > KLIBCLD usr/klibc/libc.so
    > > > > usr/klibc/execl.o: In function `execl':
    > > > > usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    > > > > usr/klibc/execle.o: In function `execle':
    > > > > usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    > > > > usr/klibc/execvpe.o: In function `execvpe':
    > > > > usr/klibc/execvpe.c:75: undefined reference to `__stack_chk_fail'
    > > > > usr/klibc/execlp.o: In function `execlp':
    > > > > usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    > > > > usr/klibc/execlpe.o: In function `execlpe':
    > > > > usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    > > > > usr/klibc/vfprintf.o:usr/klibc/vfprintf.c:26: more undefined
    > > > > references to `__stack_chk_fail' follow
    > > > > make[2]: *** [usr/klibc/libc.so] Error 1
    > > > >
    > > > > But I've searched all the .h and .c files in the tree and found no
    > > > > reference to __stack_chk_fail. I am running Ubuntu's Edgy Eft (the
    > > > > latest development tree).
    > > >
    > > > somehow you're getting -fstack-protector added to your CFLAGs.. which
    > > > won't do you any good unless you link to glibc or another library that
    > > > implements the user side of the feature...
    > >
    > > The only reference to -fstack-protector in my linux kernel tree is here:
    >
    >
    > try looking at your CFLAGS environment variable.. that may get
    > inherited ;)

    https://wiki.ubuntu.com/GccSsp

    It appears that Ubuntu's Edgy Eft (the development tree) now contains
    "Stack Smashing Protection" enabled by default. I found a web page
    that states that -fno-stack-protector can be used to disable this
    functionality. Interestingly, another web page stated that SSP has
    been enabled in Redhat compilers for a long time and is now also
    enabled in Debian SID. Perhaps -fno-stack-protector should be added
    to the kernel build be default?

    Thanks,
    Miles
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