sparc64: Fix race in signal instruction flushing.

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If another cpu does a very wide munmap() on the signal frame area,
it can tear down the page table hierarchy from underneath us.

Borrow an idea from the 64-bit fault path's get_user_insn(), and
disable cross call interrupts during the page table traversal
to lock them in place while we operate.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

David S. Miller 2010-09-20 23:24:52 -07:00

parent b343ae51c1

commit 05c5e7698b

1 changed files with 60 additions and 42 deletions

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102

arch/sparc/kernel/signal32.c

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