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meminit fix

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- Disable gcc-based stack variable auto-init under KASAN (Arnd Bergmann)
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 Comment: Kees Cook <kees@outflux.net>
 
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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
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7
security/Kconfig.hardening
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