From f443ff4201dd25cd4dec183f9919ecba90c8edc2 Mon Sep 17 00:00:00 2001 From: Brian Gerst Date: Wed, 9 Dec 2009 12:34:43 -0500 Subject: [PATCH] x86: Sync 32/64-bit kernel_thread Signed-off-by: Brian Gerst LKML-Reference: <1260380084-3707-5-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin --- arch/x86/kernel/process_32.c | 5 ++++- arch/x86/kernel/process_64.c | 11 +++++++++-- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index bd874d2b6ab1..f2e8b05a4f02 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -211,14 +211,17 @@ int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) regs.si = (unsigned long) fn; regs.di = (unsigned long) arg; +#ifdef CONFIG_X86_32 regs.ds = __USER_DS; regs.es = __USER_DS; regs.fs = __KERNEL_PERCPU; regs.gs = __KERNEL_STACK_CANARY; +#endif + regs.orig_ax = -1; regs.ip = (unsigned long) kernel_thread_helper; regs.cs = __KERNEL_CS | get_kernel_rpl(); - regs.flags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2; + regs.flags = X86_EFLAGS_IF | 0x2; /* Ok, create the new process.. */ return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 00ac66fa5c6b..d49a9094f6f3 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -248,10 +248,17 @@ int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) regs.si = (unsigned long) fn; regs.di = (unsigned long) arg; +#ifdef CONFIG_X86_32 + regs.ds = __USER_DS; + regs.es = __USER_DS; + regs.fs = __KERNEL_PERCPU; + regs.gs = __KERNEL_STACK_CANARY; +#endif + regs.orig_ax = -1; regs.ip = (unsigned long) kernel_thread_helper; - regs.cs = __KERNEL_CS; - regs.flags = X86_EFLAGS_IF; + regs.cs = __KERNEL_CS | get_kernel_rpl(); + regs.flags = X86_EFLAGS_IF | 0x2; /* Ok, create the new process.. */ return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);