x86/mm/pkeys: Fix compact mode by removing protection keys' XSAVE buffer manipulation

The Memory Protection Keys "rights register" (PKRU) is
XSAVE-managed, and is saved/restored along with the FPU state.

When kernel code accesses FPU regsisters, it does a delicate
dance with preempt.  Otherwise, the context switching code can
get confused as to whether the most up-to-date state is in the
registers themselves or in the XSAVE buffer.

But, PKRU is not a normal FPU register.  Using it does not
generate the normal device-not-available (#NM) exceptions which
means we can not manage it lazily, and the kernel completley
disallows using lazy mode when it is enabled.

The dance with preempt *only* occurs when managing the FPU
lazily.  Since we never manage PKRU lazily, we do not have to do
the dance with preempt; we can access it directly.  Doing it
this way saves a ton of complicated code (and is faster too).

Further, the XSAVES reenabling failed to patch a bit of code
in fpu__xfeature_set_state() the checked for compacted buffers.
That check caused fpu__xfeature_set_state() to silently refuse to
work when the kernel is using compacted XSAVE buffers.  This
broke execute-only and future pkey_mprotect() support when using
compact XSAVE buffers.

But, removing fpu__xfeature_set_state() gets rid of this issue,
in addition to the nice cleanup and speedup.

This fixes the same thing as a fix that Sai posted:

  https://lkml.org/lkml/2016/7/25/637

The fix that he posted is a much more obviously correct, but I
think we should just do this instead.

Reported-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-Cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20160727232040.7D060DAD@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 680049a..01567aa 100644 (file)
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -866,105 +866,17 @@ const void *get_xsave_field_ptr(int xsave_state)
        return get_xsave_addr(&fpu->state.xsave, xsave_state);
 }
 
-
-/*
- * Set xfeatures (aka XSTATE_BV) bit for a feature that we want
- * to take out of its "init state".  This will ensure that an
- * XRSTOR actually restores the state.
- */
-static void fpu__xfeature_set_non_init(struct xregs_state *xsave,
-               int xstate_feature_mask)
-{
-       xsave->header.xfeatures |= xstate_feature_mask;
-}
-
-/*
- * This function is safe to call whether the FPU is in use or not.
- *
- * Note that this only works on the current task.
- *
- * Inputs:
- *     @xsave_state: state which is defined in xsave.h (e.g. XFEATURE_MASK_FP,
- *     XFEATURE_MASK_SSE, etc...)
- *     @xsave_state_ptr: a pointer to a copy of the state that you would
- *     like written in to the current task's FPU xsave state.  This pointer
- *     must not be located in the current tasks's xsave area.
- * Output:
- *     address of the state in the xsave area or NULL if the state
- *     is not present or is in its 'init state'.
- */
-static void fpu__xfeature_set_state(int xstate_feature_mask,
-               void *xstate_feature_src, size_t len)
-{
-       struct xregs_state *xsave = &current->thread.fpu.state.xsave;
-       struct fpu *fpu = &current->thread.fpu;
-       void *dst;
-
-       if (!boot_cpu_has(X86_FEATURE_XSAVE)) {
-               WARN_ONCE(1, "%s() attempted with no xsave support", __func__);
-               return;
-       }
-
-       /*
-        * Tell the FPU code that we need the FPU state to be in
-        * 'fpu' (not in the registers), and that we need it to
-        * be stable while we write to it.
-        */
-       fpu__current_fpstate_write_begin();
-
-       /*
-        * This method *WILL* *NOT* work for compact-format
-        * buffers.  If the 'xstate_feature_mask' is unset in
-        * xcomp_bv then we may need to move other feature state
-        * "up" in the buffer.
-        */
-       if (xsave->header.xcomp_bv & xstate_feature_mask) {
-               WARN_ON_ONCE(1);
-               goto out;
-       }
-
-       /* find the location in the xsave buffer of the desired state */
-       dst = __raw_xsave_addr(&fpu->state.xsave, xstate_feature_mask);
-
-       /*
-        * Make sure that the pointer being passed in did not
-        * come from the xsave buffer itself.
-        */
-       WARN_ONCE(xstate_feature_src == dst, "set from xsave buffer itself");
-
-       /* put the caller-provided data in the location */
-       memcpy(dst, xstate_feature_src, len);
-
-       /*
-        * Mark the xfeature so that the CPU knows there is state
-        * in the buffer now.
-        */
-       fpu__xfeature_set_non_init(xsave, xstate_feature_mask);
-out:
-       /*
-        * We are done writing to the 'fpu'.  Reenable preeption
-        * and (possibly) move the fpstate back in to the fpregs.
-        */
-       fpu__current_fpstate_write_end();
-}
-
 #define NR_VALID_PKRU_BITS (CONFIG_NR_PROTECTION_KEYS * 2)
 #define PKRU_VALID_MASK (NR_VALID_PKRU_BITS - 1)
 
 /*
- * This will go out and modify the XSAVE buffer so that PKRU is
- * set to a particular state for access to 'pkey'.
- *
- * PKRU state does affect kernel access to user memory.  We do
- * not modfiy PKRU *itself* here, only the XSAVE state that will
- * be restored in to PKRU when we return back to userspace.
+ * This will go out and modify PKRU register to set the access
+ * rights for @pkey to @init_val.
  */
 int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
                unsigned long init_val)
 {
-       struct xregs_state *xsave = &tsk->thread.fpu.state.xsave;
-       struct pkru_state *old_pkru_state;
-       struct pkru_state new_pkru_state;
+       u32 old_pkru;
        int pkey_shift = (pkey * PKRU_BITS_PER_PKEY);
        u32 new_pkru_bits = 0;
 
@@ -974,6 +886,15 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
         */
        if (!boot_cpu_has(X86_FEATURE_OSPKE))
                return -EINVAL;
+       /*
+        * For most XSAVE components, this would be an arduous task:
+        * brining fpstate up to date with fpregs, updating fpstate,
+        * then re-populating fpregs.  But, for components that are
+        * never lazily managed, we can just access the fpregs
+        * directly.  PKRU is never managed lazily, so we can just
+        * manipulate it directly.  Make sure it stays that way.
+        */
+       WARN_ON_ONCE(!use_eager_fpu());
 
        /* Set the bits we need in PKRU:  */
        if (init_val & PKEY_DISABLE_ACCESS)
@@ -984,37 +905,12 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
        /* Shift the bits in to the correct place in PKRU for pkey: */
        new_pkru_bits <<= pkey_shift;
 
-       /* Locate old copy of the state in the xsave buffer: */
-       old_pkru_state = get_xsave_addr(xsave, XFEATURE_MASK_PKRU);
-
-       /*
-        * When state is not in the buffer, it is in the init
-        * state, set it manually.  Otherwise, copy out the old
-        * state.
-        */
-       if (!old_pkru_state)
-               new_pkru_state.pkru = 0;
-       else
-               new_pkru_state.pkru = old_pkru_state->pkru;
-
-       /* Mask off any old bits in place: */
-       new_pkru_state.pkru &= ~((PKRU_AD_BIT|PKRU_WD_BIT) << pkey_shift);
-
-       /* Set the newly-requested bits: */
-       new_pkru_state.pkru |= new_pkru_bits;
-
-       /*
-        * We could theoretically live without zeroing pkru.pad.
-        * The current XSAVE feature state definition says that
-        * only bytes 0->3 are used.  But we do not want to
-        * chance leaking kernel stack out to userspace in case a
-        * memcpy() of the whole xsave buffer was done.
-        *
-        * They're in the same cacheline anyway.
-        */
-       new_pkru_state.pad = 0;
+       /* Get old PKRU and mask off any old bits in place: */
+       old_pkru = read_pkru();
+       old_pkru &= ~((PKRU_AD_BIT|PKRU_WD_BIT) << pkey_shift);
 
-       fpu__xfeature_set_state(XFEATURE_MASK_PKRU, &new_pkru_state, sizeof(new_pkru_state));
+       /* Write old part along with new part: */
+       write_pkru(old_pkru | new_pkru_bits);
 
        return 0;
 }