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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-05 16:46:15 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-05 16:46:15 +0200 |
| commit | 2071b3e34fd33e496ebd7b90331ac5b3b0ac3b81 (patch) | |
| tree | aeee17f8994ffaa234354cfe70d664f85b331247 /arch/x86/Kconfig | |
| parent | Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... (diff) | |
| parent | Merge commit '7ed6fb9b5a5510e4ef78ab27419184741169978a' into x86/espfix (diff) | |
| download | linux-2071b3e34fd33e496ebd7b90331ac5b3b0ac3b81.tar.xz linux-2071b3e34fd33e496ebd7b90331ac5b3b0ac3b81.zip | |
Merge branch 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next
Pull x86-64 espfix changes from Peter Anvin:
"This is the espfix64 code, which fixes the IRET information leak as
well as the associated functionality problem. With this code applied,
16-bit stack segments finally work as intended even on a 64-bit
kernel.
Consequently, this patchset also removes the runtime option that we
added as an interim measure.
To help the people working on Linux kernels for very small systems,
this patchset also makes these compile-time configurable features"
* 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"
x86, espfix: Make it possible to disable 16-bit support
x86, espfix: Make espfix64 a Kconfig option, fix UML
x86, espfix: Fix broken header guard
x86, espfix: Move espfix definitions into a separate header file
x86-32, espfix: Remove filter for espfix32 due to race
x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 272b493ea1bf..b660088c220d 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -912,10 +912,27 @@ config VM86 default y depends on X86_32 ---help--- - This option is required by programs like DOSEMU to run 16-bit legacy - code on X86 processors. It also may be needed by software like - XFree86 to initialize some video cards via BIOS. Disabling this - option saves about 6k. + This option is required by programs like DOSEMU to run + 16-bit real mode legacy code on x86 processors. It also may + be needed by software like XFree86 to initialize some video + cards via BIOS. Disabling this option saves about 6K. + +config X86_16BIT + bool "Enable support for 16-bit segments" if EXPERT + default y + ---help--- + This option is required by programs like Wine to run 16-bit + protected mode legacy code on x86 processors. Disabling + this option saves about 300 bytes on i386, or around 6K text + plus 16K runtime memory on x86-64, + +config X86_ESPFIX32 + def_bool y + depends on X86_16BIT && X86_32 + +config X86_ESPFIX64 + def_bool y + depends on X86_16BIT && X86_64 config TOSHIBA tristate "Toshiba Laptop support" |