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parisc: Correct completer in lws start
commit 8f66fce0f4
upstream.
The completer in the "or,ev %r1,%r30,%r30" instruction is reversed, so we are
not clipping the LWS number when we are called from a 32-bit process (W=0).
We need to nulify the following depdi instruction when the least-significant
bit of %r30 is 1.
If the %r20 register is not clipped, a user process could perform a LWS call
that would branch to an undefined location in the kernel and potentially crash
the machine.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org # 4.19+
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 1 deletions
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@ -478,7 +478,7 @@ lws_start:
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extrd,u %r1,PSW_W_BIT,1,%r1
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/* sp must be aligned on 4, so deposit the W bit setting into
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* the bottom of sp temporarily */
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or,ev %r1,%r30,%r30
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or,od %r1,%r30,%r30
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/* Clip LWS number to a 32-bit value for 32-bit processes */
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depdi 0, 31, 32, %r20
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