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- Do not hold fpregs lock when inheriting FPU permissions because the

Browse Source 
fpregs lock disables preemption on RT but fpu_inherit_perms() does
 spin_lock_irq(), which, on RT, uses rtmutexes and they need to be
 preemptible.
 
 - Check the page offset and the length of the data supplied by userspace
 for overflow when specifying a set of pages to add to an SGX enclave
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Merge tag 'x86_urgent_for_v6.1_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - Do not hold fpregs lock when inheriting FPU permissions because the
   fpregs lock disables preemption on RT but fpu_inherit_perms() does
   spin_lock_irq(), which, on RT, uses rtmutexes and they need to be
   preemptible.

 - Check the page offset and the length of the data supplied by
   userspace for overflow when specifying a set of pages to add to an
   SGX enclave

* tag 'x86_urgent_for_v6.1_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Drop fpregs lock before inheriting FPU permissions
  x86/sgx: Add overflow check in sgx_validate_offset_length()
This commit is contained in:
Linus Torvalds 2022-11-20 10:47:39 -08:00
commit 894909f95a
2 changed files with 4 additions and 1 deletions
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3
arch/x86/kernel/cpu/sgx/ioctl.c
View File

@ -356,6 +356,9 @@ static int sgx_validate_offset_length(struct sgx_encl *encl,
if (!length || !IS_ALIGNED(length, PAGE_SIZE))
return -EINVAL;
if (offset + length < offset)
return -EINVAL;
if (offset + length - PAGE_SIZE >= encl->size)
return -EINVAL;

2
arch/x86/kernel/fpu/core.c
View File

@ -605,9 +605,9 @@ int fpu_clone(struct task_struct *dst, unsigned long clone_flags, bool minimal)
if (test_thread_flag(TIF_NEED_FPU_LOAD))
fpregs_restore_userregs();
save_fpregs_to_fpstate(dst_fpu);
fpregs_unlock();
if (!(clone_flags & CLONE_THREAD))
fpu_inherit_perms(dst_fpu);
fpregs_unlock();
/*
* Children never inherit PASID state.