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| author | H. Peter Anvin <hpa@zytor.com> | 2010-04-23 16:17:40 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-04-23 16:49:51 -0700 |
| commit | 7ce5a2b9bb2e92902230e3121d8c3047fab9cb47 (patch) | |
| tree | e8741ea11f5644d4a49ef9e4b66820977d577d3f /arch/Kconfig | |
| parent | ae7c9b70dcb4313ea3dbcc9a2f240dae6c2b50c0 (diff) | |
| download | blackbird-op-linux-7ce5a2b9bb2e92902230e3121d8c3047fab9cb47.tar.gz blackbird-op-linux-7ce5a2b9bb2e92902230e3121d8c3047fab9cb47.zip | |
x86-64: Clear a 64-bit FS/GS base on fork if selector is nonzero
When we do a thread switch, we clear the outgoing FS/GS base if the
corresponding selector is nonzero. This is taken by __switch_to() as
an entry invariant; it does not verify that it is true on entry.
However, copy_thread() doesn't enforce this constraint, which can
result in inconsistent results after fork().
Make copy_thread() match the behavior of __switch_to().
Reported-and-tested-by: Samuel Thibault <samuel.thibault@inria.fr>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <4BD1E061.8030605@zytor.com>
Cc: <stable@kernel.org>
Diffstat (limited to 'arch/Kconfig')
0 files changed, 0 insertions, 0 deletions
