| Message ID | 20221214232602.4118147-1-nathan@kernel.org (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | d6a9fb87e9d18f3394a9845546bbe868efdccfd2 |
| Headers | show |
| Series | security: Restrict CONFIG_ZERO_CALL_USED_REGS to gcc or clang > 15.0.6 | expand |
On Wed, 14 Dec 2022 16:26:03 -0700, Nathan Chancellor wrote: > A bad bug in clang's implementation of -fzero-call-used-regs can result > in NULL pointer dereferences (see the links above the check for more > information). Restrict CONFIG_CC_HAS_ZERO_CALL_USED_REGS to either a > supported GCC version or a clang newer than 15.0.6, which will catch > both a theoretical 15.0.7 and the upcoming 16.0.0, which will both have > the bug fixed. > > [...] Applied to for-next/hardening, thanks! (And I'll send it for v6.2-rc1 too.) [1/1] security: Restrict CONFIG_ZERO_CALL_USED_REGS to gcc or clang > 15.0.6 https://git.kernel.org/kees/c/d6a9fb87e9d1
diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening index d766b7d0ffd1..53baa95cb644 100644 --- a/security/Kconfig.hardening +++ b/security/Kconfig.hardening @@ -257,6 +257,9 @@ config INIT_ON_FREE_DEFAULT_ON config CC_HAS_ZERO_CALL_USED_REGS def_bool $(cc-option,-fzero-call-used-regs=used-gpr) + # https://github.com/ClangBuiltLinux/linux/issues/1766 + # https://github.com/llvm/llvm-project/issues/59242 + depends on !CC_IS_CLANG || CLANG_VERSION > 150006 config ZERO_CALL_USED_REGS bool "Enable register zeroing on function exit"
A bad bug in clang's implementation of -fzero-call-used-regs can result in NULL pointer dereferences (see the links above the check for more information). Restrict CONFIG_CC_HAS_ZERO_CALL_USED_REGS to either a supported GCC version or a clang newer than 15.0.6, which will catch both a theoretical 15.0.7 and the upcoming 16.0.0, which will both have the bug fixed. Cc: stable@vger.kernel.org # v5.15+ Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- security/Kconfig.hardening | 3 +++ 1 file changed, 3 insertions(+) base-commit: 830b3c68c1fb1e9176028d02ef86f3cf76aa2476