security, keys: convert key.usage from atomic_t to refcount_t

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refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

...

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Elena Reshetova 2017-03-31 15:20:48 +03:00 • committed by James Morris

parent 8291798dcf

commit fff292914d

6 changed files with 13 additions and 12 deletions

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5

include/linux/key.h

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2

security/keys/gc.c

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6

security/keys/key.c

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8

security/keys/keyring.c

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2

security/keys/proc.c

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2

security/keys/request_key_auth.c

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