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| author | Julien Thierry <julien.thierry@arm.com> | 2018-09-11 10:12:05 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-10-05 10:51:15 +0100 |
| commit | 73839798af7ebc6c8d0c9271ebbbc148700e521f (patch) | |
| tree | a94c6eb00e0314eea36b34e05542b82a245f5eed /arch/arm/kernel | |
| parent | 5ca451cf6ed04443774bbb7ee45332dafa42e99f (diff) | |
| download | linux-73839798af7ebc6c8d0c9271ebbbc148700e521f.tar.bz2 | |
ARM: 8790/1: signal: always use __copy_to_user to save iwmmxt context
When setting a dummy iwmmxt context, create a local instance and
use __copy_to_user both cases whether iwmmxt is being used or not.
This has the benefit of disabling/enabling PAN once for the whole copy
intead of once per write.
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/signal.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 24a78cb6f031..240a30e167fd 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -77,8 +77,6 @@ static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame) kframe->magic = IWMMXT_MAGIC; kframe->size = IWMMXT_STORAGE_SIZE; iwmmxt_task_copy(current_thread_info(), &kframe->storage); - - err = __copy_to_user(frame, kframe, sizeof(*frame)); } else { /* * For bug-compatibility with older kernels, some space @@ -86,10 +84,14 @@ static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame) * Set the magic and size appropriately so that properly * written userspace can skip it reliably: */ - __put_user_error(DUMMY_MAGIC, &frame->magic, err); - __put_user_error(IWMMXT_STORAGE_SIZE, &frame->size, err); + *kframe = (struct iwmmxt_sigframe) { + .magic = DUMMY_MAGIC, + .size = IWMMXT_STORAGE_SIZE, + }; } + err = __copy_to_user(frame, kframe, sizeof(*kframe)); + return err; } |