Commit-ID: 72c6fb4f74b6b3797f5b1abd6944d7a1d2adbf04
Gitweb: http://git.kernel.org/tip/72c6fb4f74b6b3797f5b1abd6944d7a1d2adbf04
Author: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
AuthorDate: Tue, 24 Feb 2015 16:01:39 -0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 25 Feb 2015 08:27:50 +0100
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 <luto@xxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/45e2d0d695393d76406a0c7225b82c76223e0cc5.1424822291.git.luto@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/process_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 5a2c029..936d434 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
--
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