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authorMichael LeMay <mdlemay@epoch.ncsc.mil>2006-06-26 00:24:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:18 -0700
commite51f6d343789a4f0a2a7587ad7ec7746969d5c1c (patch)
tree39ca4e05c0dda995f3eaaea1aaa2c8689003f1d0 /security/Kconfig
parent5801649d8b83e7cb9b15839761bdee594653c294 (diff)
[PATCH] keys: allocate key serial numbers randomly
Cause key_alloc_serial() to generate key serial numbers randomly rather than in linear sequence. Using an linear sequence permits a covert communication channel to be established, in which one process can communicate with another by creating or not creating new keys within a certain timeframe. The second process can probe for the expected next key serial number and judge its existence by the error returned. This is a problem as the serial number namespace is globally shared between all tasks, regardless of their context. For more information on this topic, this old TCSEC guide is recommended: http://www.radium.ncsc.mil/tpep/library/rainbow/NCSC-TG-030.html Signed-off-by: Michael LeMay <mdlemay@epoch.ncsc.mil> Signed-off-by: James Morris <jmorris@namei.org> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/Kconfig')
0 files changed, 0 insertions, 0 deletions

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