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Currently we allocate 64k space on the user stack and use it the msgbuf for
sys_{msgrcv,msgsnd} for compat and the results are later copied in user [
by copy_in_user]. This patch introduces helper routines for
sys_{msgrcv,msgsnd} as below:
do_msgsnd() : Accepts the mtype and user space ptr to the buffer along with
the msqid and msgflg.
do_msgrcv() : Accepts a kernel space ptr to mtype and a userspace ptr to
the buffer. The mtype has to be copied back the user space msgbuf by the
caller.
These changes avoid the need to allocate the msgsize on the userspace (
thus removing the size limt ) and the overhead of an extra copy_in_user().
Signed-off-by: Suzuki K P <suzuki@in.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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Change the /proc/sysvipc/shm|sem|msg files to use the generic seq_file
implementation for struct ipc_ids.
Signed-off-by: Mike Waychison <mikew@google.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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From: Manfred Spraul <manfred@colorfullife.com>
cleanup of sysv ipc as a preparation for posix message queues:
- replace !CONFIG_SYSVIPC wrappers for copy_semundo and exit_sem with
static inline wrappers. Now the whole ipc/util.c file is only used if
CONFIG_SYSVIPC is set, use makefile magic instead of #ifdef.
- remove the prototypes for copy_semundo and exit_sem from kernel/fork.c
- they belong into a header file.
- create a new msgutil.c with the helper functions for message queues.
- cleanup the helper functions: run Lindent, add __user tags.
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From: "Randy.Dunlap" <rddunlap@osdl.org>
Add syscalls.h, which contains prototypes for the kernel's system calls.
Replace open-coded declarations all over the place. This patch found a
couple of prior bugs. It appears to be more important with -mregparm=3 as we
discover more asmlinkage mismatches.
Some syscalls have arch-dependent arguments, so their prototypes are in the
arch-specific unistd.h. Maybe it should have been asm/syscalls.h, but there
were already arch-specific syscall prototypes in asm/unistd.h...
Tested on x86, ia64, x86_64, ppc64, s390 and sparc64. May cause
trivial-to-fix build breakage on other architectures.
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msg.h uses list_head. (I'm not sure what config actually required this, but
it is legit).
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This patch adds the remaining System V IPC hooks, including the inline
documentation for them in security.h. This includes a restored
sem_semop hook, as it does seem to be necessary to support fine-grained
access.
All of these System V IPC hooks are used by SELinux. The SELinux System
V IPC access controls were originally described in the technical report
available from http://www.nsa.gov/selinux/slinux-abs.html, and the
LSM-based implementation is described in the technical report available
from http://www.nsa.gov/selinux/module-abs.html.
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msg.c file to the msg.h file
Also move where the msg->q_perm.mode and .key values get set to before
ipc_addid() gets called to make placing a hook there easier.
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