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author | David S. Miller <davem@davemloft.net> | 2016-07-27 17:50:26 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-21 10:06:40 +0100 |
commit | a395f7a66eec5db41f8860427f955d4cdabb1063 (patch) | |
tree | b88f7740fe2589dd76bcb7635696434e73672eca /kernel/Kconfig.locks | |
parent | 4e772c53ab9836b083c21acf9d2d76805e1d133e (diff) |
sparc: Don't leak context bits into thread->fault_address
[ Upstream commit 4f6deb8cbab532a8d7250bc09234c1795ecb5e2c ]
On pre-Niagara systems, we fetch the fault address on data TLB
exceptions from the TLB_TAG_ACCESS register. But this register also
contains the context ID assosciated with the fault in the low 13 bits
of the register value.
This propagates into current_thread_info()->fault_address and can
cause trouble later on.
So clear the low 13-bits out of the TLB_TAG_ACCESS value in the cases
where it matters.
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/Kconfig.locks')
0 files changed, 0 insertions, 0 deletions