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sgi-xp: Use designated initializers

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Prepare to mark sensitive kernel structures for randomization by making
sure they're using designated initializers. In this case, no initializers
are needed (they can be NULL initialized and callers adjusted to check
for NULL, which is more efficient than an indirect call).

Cc: Robin Holt <robinmholt@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
This commit is contained in:
Kees Cook 2017-04-04 22:07:10 -07:00
parent 7585d12f65
commit 234041dfe5
2 changed files with 18 additions and 30 deletions
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12
drivers/misc/sgi-xp/xp.h
View file

@ -309,6 +309,9 @@ static inline enum xp_retval
xpc_send(short partid, int ch_number, u32 flags, void *payload,
u16 payload_size)
{
if (!xpc_interface.send)
return xpNotLoaded;
return xpc_interface.send(partid, ch_number, flags, payload,
payload_size);
}
@ -317,6 +320,9 @@ static inline enum xp_retval
xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
u16 payload_size, xpc_notify_func func, void *key)
{
if (!xpc_interface.send_notify)
return xpNotLoaded;
return xpc_interface.send_notify(partid, ch_number, flags, payload,
payload_size, func, key);
}
@ -324,12 +330,16 @@ xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
static inline void
xpc_received(short partid, int ch_number, void *payload)
{
return xpc_interface.received(partid, ch_number, payload);
if (xpc_interface.received)
xpc_interface.received(partid, ch_number, payload);
}
static inline enum xp_retval
xpc_partid_to_nasids(short partid, void *nasids)
{
if (!xpc_interface.partid_to_nasids)
return xpNotLoaded;
return xpc_interface.partid_to_nasids(partid, nasids);
}

36
drivers/misc/sgi-xp/xp_main.c
View file

@ -69,23 +69,9 @@ struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS];
EXPORT_SYMBOL_GPL(xpc_registrations);
/*
* Initialize the XPC interface to indicate that XPC isn't loaded.
* Initialize the XPC interface to NULL to indicate that XPC isn't loaded.
*/
static enum xp_retval
xpc_notloaded(void)
{
return xpNotLoaded;
}
struct xpc_interface xpc_interface = {
(void (*)(int))xpc_notloaded,
(void (*)(int))xpc_notloaded,
(enum xp_retval(*)(short, int, u32, void *, u16))xpc_notloaded,
(enum xp_retval(*)(short, int, u32, void *, u16, xpc_notify_func,
void *))xpc_notloaded,
(void (*)(short, int, void *))xpc_notloaded,
(enum xp_retval(*)(short, void *))xpc_notloaded
};
struct xpc_interface xpc_interface = { };
EXPORT_SYMBOL_GPL(xpc_interface);
/*
@ -115,17 +101,7 @@ EXPORT_SYMBOL_GPL(xpc_set_interface);
void
xpc_clear_interface(void)
{
xpc_interface.connect = (void (*)(int))xpc_notloaded;
xpc_interface.disconnect = (void (*)(int))xpc_notloaded;
xpc_interface.send = (enum xp_retval(*)(short, int, u32, void *, u16))
xpc_notloaded;
xpc_interface.send_notify = (enum xp_retval(*)(short, int, u32, void *,
u16, xpc_notify_func,
void *))xpc_notloaded;
xpc_interface.received = (void (*)(short, int, void *))
xpc_notloaded;
xpc_interface.partid_to_nasids = (enum xp_retval(*)(short, void *))
xpc_notloaded;
memset(&xpc_interface, 0, sizeof(xpc_interface));
}
EXPORT_SYMBOL_GPL(xpc_clear_interface);
@ -188,7 +164,8 @@ xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
mutex_unlock(&registration->mutex);
xpc_interface.connect(ch_number);
if (xpc_interface.connect)
xpc_interface.connect(ch_number);
return xpSuccess;
}
@ -237,7 +214,8 @@ xpc_disconnect(int ch_number)
registration->assigned_limit = 0;
registration->idle_limit = 0;
xpc_interface.disconnect(ch_number);
if (xpc_interface.disconnect)
xpc_interface.disconnect(ch_number);
mutex_unlock(&registration->mutex);