• Eric W. Biederman's avatar
    signal/sparc: Document a conflict with SI_USER with SIGFPE · cc9f72e4
    Eric W. Biederman authored
    Setting si_code to __SI_FAULT results in a userspace seeing
    an si_code of 0.  This is the same si_code as SI_USER.  Posix
    and common sense requires that SI_USER not be a signal specific
    si_code.  As such this use of 0 for the si_code is a pretty
    horribly broken ABI.
    
    This was introduced in 2.3.41 so this mess has had a long time for
    people to be able to start depending on it.
    
    As this bug has existed for 17 years already I don't know if it is
    worth fixing.  It is definitely worth documenting what is going
    on so that no one decides to copy this bad decision.
    
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: sparclinux@vger.kernel.org
    Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
    cc9f72e4
traps_64.c 80.4 KB