diff options
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/extable.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index aaeda3ffaafe..4bb53b89f3c5 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -70,6 +70,16 @@ bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup, } EXPORT_SYMBOL(ex_handler_wrmsr_unsafe); +bool ex_handler_clear_fs(const struct exception_table_entry *fixup, + struct pt_regs *regs, int trapnr) +{ + if (static_cpu_has(X86_BUG_NULL_SEG)) + asm volatile ("mov %0, %%fs" : : "rm" (__USER_DS)); + asm volatile ("mov %0, %%fs" : : "rm" (0)); + return ex_handler_default(fixup, regs, trapnr); +} +EXPORT_SYMBOL(ex_handler_clear_fs); + bool ex_has_fault_handler(unsigned long ip) { const struct exception_table_entry *e; |