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| author | H. Peter Anvin <hpa@zytor.com> | 2012-02-19 10:06:34 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-02-20 12:52:05 -0800 |
| commit | d1a797f388d6d30fa502915d1b9937ed758b7137 (patch) | |
| tree | ab16d4c32792dea0f0f841d7bce9f37ef962ad79 /arch/x86/kernel/process_64.c | |
| parent | c5a373942bbc41698724fc948c74f959f73407e5 (diff) | |
| download | linux-stable-d1a797f388d6d30fa502915d1b9937ed758b7137.tar.gz linux-stable-d1a797f388d6d30fa502915d1b9937ed758b7137.tar.bz2 linux-stable-d1a797f388d6d30fa502915d1b9937ed758b7137.zip | |
x32: Handle process creation
Allow an x32 process to be started.
Originally-by: H. J. Lu <hjl.tools@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 5fe2fbaa56ba..a0701da2bd18 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -364,7 +364,9 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp) { start_thread_common(regs, new_ip, new_sp, - __USER32_CS, __USER32_DS, __USER32_DS); + test_thread_flag(TIF_X32) + ? __USER_CS : __USER32_CS, + __USER_DS, __USER_DS); } #endif @@ -508,6 +510,7 @@ void set_personality_64bit(void) /* Make sure to be in 64bit mode */ clear_thread_flag(TIF_IA32); + clear_thread_flag(TIF_X32); clear_thread_flag(TIF_ADDR32); clear_thread_flag(TIF_X32); @@ -522,22 +525,28 @@ void set_personality_64bit(void) current->personality &= ~READ_IMPLIES_EXEC; } -void set_personality_ia32(void) +void set_personality_ia32(bool x32) { /* inherit personality from parent */ /* Make sure to be in 32bit mode */ - set_thread_flag(TIF_IA32); set_thread_flag(TIF_ADDR32); - clear_thread_flag(TIF_X32); - current->personality |= force_personality32; /* Mark the associated mm as containing 32-bit tasks. */ if (current->mm) current->mm->context.ia32_compat = 1; - /* Prepare the first "return" to user space */ - current_thread_info()->status |= TS_COMPAT; + if (x32) { + clear_thread_flag(TIF_IA32); + set_thread_flag(TIF_X32); + current->personality &= ~READ_IMPLIES_EXEC; + } else { + set_thread_flag(TIF_IA32); + clear_thread_flag(TIF_X32); + current->personality |= force_personality32; + /* Prepare the first "return" to user space */ + current_thread_info()->status |= TS_COMPAT; + } } unsigned long get_wchan(struct task_struct *p) |