diff options
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 18 |
1 files changed, 3 insertions, 15 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 038633abf5ab..2e8f6fd28e59 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2330,7 +2330,9 @@ choice it can be used to assist security vulnerability exploitation. This setting can be changed at boot time via the kernel command - line parameter vsyscall=[emulate|xonly|none]. + line parameter vsyscall=[emulate|xonly|none]. Emulate mode + is deprecated and can only be enabled using the kernel command + line. On a system with recent enough glibc (2.14 or newer) and no static binaries, you can say None without a performance penalty @@ -2338,20 +2340,6 @@ choice If unsure, select "Emulate execution only". - config LEGACY_VSYSCALL_EMULATE - bool "Full emulation" - help - The kernel traps and emulates calls into the fixed vsyscall - address mapping. This makes the mapping non-executable, but - it still contains readable known contents, which could be - used in certain rare security vulnerability exploits. This - configuration is recommended when using legacy userspace - that still uses vsyscalls along with legacy binary - instrumentation tools that require code to be readable. - - An example of this type of legacy userspace is running - Pin on an old binary that still uses vsyscalls. - config LEGACY_VSYSCALL_XONLY bool "Emulate execution only" help |