Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'

H. Peter Anvin wrote:

Sam Ravnborg wrote:

For klibc you need to patch scripts/Kbuild.klibc

Appending it to KLIBCWARNFLAGS seems the right place.

KLIBCREQFLAGS, rather.

Do you know from what gcc version we can start using -fno-stack-protector?

Isn't there a macro to test if gcc supports a specific option already?

Either way, I can also add __stack_chk_fail() as an alias for abort(), for people who actually want the feature.

I looked at it again, and it looks like gcc depends on the TLS ABI in order to pick the value of the cookie. That makes it a potentially lot more cantankerous option; I would like to be able to support stack-smash checking in klibc, but if it means implementing TLS on all architectures, then that would really defeat the purpose (and we should add -fno-stack-protector to KLIBCREQFLAGS.)

Arjan: I see a few stack-protector-related have your name on it, do you have any details on implementation constraints for this across architectures?

	-hpa
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---

• References:
  • 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: "Miles Lane" <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: Arjan van de Ven <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: "Miles Lane" <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: Arjan van de Ven <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: "Miles Lane" <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: "Miles Lane" <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: Sam Ravnborg <[email protected]>
  • Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
    • From: "H. Peter Anvin" <[email protected]>

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