meminit fix

- Disable gcc-based stack variable auto-init under KASAN (Arnd Bergmann)
 -----BEGIN PGP SIGNATURE-----
 Comment: Kees Cook <kees@outflux.net>
 
 iQJKBAABCgA0FiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAl099MsWHGtlZXNjb29r
 QGNocm9taXVtLm9yZwAKCRCJcvTf3G3AJr6GD/0Xl/YxeXPnKIHoafoqMCBAY12f
 OnRZ2N6YCikYfLwgBnTAAyQi3P0qU8ffjt4LjoPxzByUPBmZ+VkUBXU1eNUuU0mT
 4CX+ZakeWp5atbg7Ja7DAThBrJS4DYRzXiGB1Is8IACD/zkkRDoGU1tN+3nubtlk
 F2SYtmJBz/6pje2ksLDmuSS1sapaom7Cs4khB/oDb8HOsqydS0CpzN7Oa/Di3HoZ
 yUbyM3bcgmYECasGt7zVOLzr/EcI4T7rtLhMTnFBMbfckQJBPc7UpaLTt9pxMVqO
 Vo7SH/q8atmp3aThT3XbEYbSvx4kUdHZYcuMogPe8T+3Bx4i9gWGnmpqF94P0Kl8
 SZgY92JEhF92PwVTi7ztAfAZQDunVm60c/Lp44r0q/lGQKZLXP8jQXd7KmL6dnPI
 gDnispJnNdNxVSVDx/r3yjSRh0VCA3yv01ed/pusCrxX48sEw7ExwswEJBy12O3s
 rUY7Xx/U+eIP+E+4B7ddlzTFy+0t6HQ0q0LLtbiim1ELF+8ZBnAvCMnm49SQbpEQ
 UMgO/bCAGkGu88uR3sclIwUbaR9oCCxkZO0YuLvAnGoMJ7JaYQlDmDqe/lWP7VjV
 HEmJxDpJE9SgmVtYkfz3aOEds5nSspRQOQfQpnq/JxjRQTSfriSpDpl72d5qk1CH
 WHAM8lviqVg/uT6r2Q==
 =z0XP
 -----END PGP SIGNATURE-----

Merge tag 'meminit-v5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull structleak fix from Kees Cook:
 "Disable gcc-based stack variable auto-init under KASAN (Arnd
  Bergmann).

  This fixes a bunch of build warnings under KASAN and the
  gcc-plugin-based stack auto-initialization features (which are
  arguably redundant, so better to let KASAN control this)"

* tag 'meminit-v5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  structleak: disable STRUCTLEAK_BYREF in combination with KASAN_STACK
This commit is contained in:
Linus Torvalds 2019-07-28 12:33:15 -07:00
commit c622fc5f54
1 changed files with 7 additions and 0 deletions

View File

@ -61,6 +61,7 @@ choice
config GCC_PLUGIN_STRUCTLEAK_BYREF
bool "zero-init structs passed by reference (strong)"
depends on GCC_PLUGINS
depends on !(KASAN && KASAN_STACK=1)
select GCC_PLUGIN_STRUCTLEAK
help
Zero-initialize any structures on the stack that may
@ -70,9 +71,15 @@ choice
exposures, like CVE-2017-1000410:
https://git.kernel.org/linus/06e7e776ca4d3654
As a side-effect, this keeps a lot of variables on the
stack that can otherwise be optimized out, so combining
this with CONFIG_KASAN_STACK can lead to a stack overflow
and is disallowed.
config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
bool "zero-init anything passed by reference (very strong)"
depends on GCC_PLUGINS
depends on !(KASAN && KASAN_STACK=1)
select GCC_PLUGIN_STRUCTLEAK
help
Zero-initialize any stack variables that may be passed