From: Andy Lutomirski Date: Wed, 25 Feb 2015 00:01:39 +0000 (-0800) Subject: x86/ia32-compat: Fix CLONE_SETTLS bitness of copy_thread() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=72c6fb4f74b6b3797f5b1abd6944d7a1d2adbf04;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git x86/ia32-compat: Fix CLONE_SETTLS bitness of copy_thread() CLONE_SETTLS is expected to write a TLS entry in the GDT for 32-bit callers and to set FSBASE for 64-bit callers. The correct check is is_ia32_task(), which returns true in the context of a 32-bit syscall. TIF_IA32 is set if the task itself has a 32-bit personality, which is not the same thing. Signed-off-by: Andy Lutomirski Cc: Borislav Petkov Cc: Denys Vlasenko Link: http://lkml.kernel.org/r/45e2d0d695393d76406a0c7225b82c76223e0cc5.1424822291.git.luto@amacapital.net Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 5a2c02913af3..936d43461dca 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -207,7 +207,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, */ if (clone_flags & CLONE_SETTLS) { #ifdef CONFIG_IA32_EMULATION - if (test_thread_flag(TIF_IA32)) + if (is_ia32_task()) err = do_set_thread_area(p, -1, (struct user_desc __user *)childregs->si, 0); else