diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-10-11 20:23:20 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-10-11 20:23:20 +0200 |
commit | 0afe2db21394820d32646a695eccf3fbfe6ab5c7 (patch) | |
tree | 6d925383f444a242ebc77d167420efb7e6ad8d99 /arch/x86/mm/init_64.c | |
parent | d84705969f898f294bc3fc32eca33580f14105bd (diff) | |
parent | 43603c8df97f246e8be7b9cc92a8f968a85108bd (diff) |
Merge branch 'x86/unify-cpu-detect' into x86-v28-for-linus-phase4-D
Conflicts:
arch/x86/kernel/cpu/common.c
arch/x86/kernel/signal_64.c
include/asm-x86/cpufeature.h
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r-- | arch/x86/mm/init_64.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index fb30486c82f..83e13f2d53d 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -88,6 +88,62 @@ early_param("gbpages", parse_direct_gbpages_on); int after_bootmem; +unsigned long __supported_pte_mask __read_mostly = ~0UL; +EXPORT_SYMBOL_GPL(__supported_pte_mask); + +static int do_not_nx __cpuinitdata; + +/* + * noexec=on|off + * Control non-executable mappings for 64-bit processes. + * + * on Enable (default) + * off Disable + */ +static int __init nonx_setup(char *str) +{ + if (!str) + return -EINVAL; + if (!strncmp(str, "on", 2)) { + __supported_pte_mask |= _PAGE_NX; + do_not_nx = 0; + } else if (!strncmp(str, "off", 3)) { + do_not_nx = 1; + __supported_pte_mask &= ~_PAGE_NX; + } + return 0; +} +early_param("noexec", nonx_setup); + +void __cpuinit check_efer(void) +{ + unsigned long efer; + + rdmsrl(MSR_EFER, efer); + if (!(efer & EFER_NX) || do_not_nx) + __supported_pte_mask &= ~_PAGE_NX; +} + +int force_personality32; + +/* + * noexec32=on|off + * Control non executable heap for 32bit processes. + * To control the stack too use noexec=off + * + * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) + * off PROT_READ implies PROT_EXEC + */ +static int __init nonx32_setup(char *str) +{ + if (!strcmp(str, "on")) + force_personality32 &= ~READ_IMPLIES_EXEC; + else if (!strcmp(str, "off")) + force_personality32 |= READ_IMPLIES_EXEC; + return 1; +} +__setup("noexec32=", nonx32_setup); + /* * NOTE: This function is marked __ref because it calls __init function * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. |