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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-06-23 14:02:26 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-06-23 20:01:55 +0200 |
| commit | 9ba589f9cdbd8906465b108bc7ec0fc1519a06d3 (patch) | |
| tree | f01298aefbdbdb3fc1477075d60937864ff7f8c5 /arch/x86 | |
| parent | x86/fpu/signal: Move initial checks into fpu__restore_sig() (diff) | |
| download | linux-9ba589f9cdbd8906465b108bc7ec0fc1519a06d3.tar.xz linux-9ba589f9cdbd8906465b108bc7ec0fc1519a06d3.zip | |
x86/fpu/signal: Remove the legacy alignment check
Checking for the XSTATE buffer being 64-byte aligned, and if not,
deciding just to restore the FXSR state is daft.
If user space provides an unaligned math frame and has the extended state
magic set in the FX software reserved bytes, then it really can keep the
pieces.
If the frame is unaligned and the FX software magic is not set, then
fx_only is already set and the restore will use fxrstor.
Remove it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121457.184149902@linutronix.de
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/fpu/signal.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c index 42e85c3fe9de..8a327c05bb86 100644 --- a/arch/x86/kernel/fpu/signal.c +++ b/arch/x86/kernel/fpu/signal.c @@ -306,9 +306,6 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx, } } - if ((unsigned long)buf_fx % 64) - fx_only = 1; - if (!ia32_fxstate) { /* * Attempt to restore the FPU registers directly from user |