linux-stable.git/ipc/compat.c, branch linux-3.10.y

ipc: fix compat msgrcv with negative msgtyp

2015-04-19T08:10:50+00:00

commit e7ca2552369c1dfe0216c626baf82c3d83ec36bb upstream.

Compat function takes msgtyp argument as u32 and passes it down to
do_msgrcv which results in casting to long, thus the sign is lost and we
get a big positive number instead.

Cast the argument to signed type before passing it down.

Signed-off-by: Mateusz Guzik 
Reported-by: Gabriellla Schmidt 
Cc: Al Viro 
Cc: Davidlohr Bueso 
Cc: Manfred Spraul 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Cc: Masanari Iida 
Signed-off-by: Greg Kroah-Hartman

get rid of union semop in sys_semctl(2) arguments

2013-03-05T20:14:16+00:00

just have the bugger take unsigned long and deal with SETVAL
case (when we use an int member in the union) explicitly.

Signed-off-by: Al Viro

get rid of compat_sys_semctl() and friends in case of ARCH_WANT_OLD_COMPAT_IPC

2013-03-04T04:00:27+00:00

Signed-off-by: Al Viro

merge compat sys_ipc instances

2013-03-04T04:00:27+00:00

Signed-off-by: Al Viro

selftests: IPC message queue copy feature test

2013-01-05T00:11:45+00:00

This test can be used to check wheither kernel supports IPC message queue
copy and restore features (required by CRIU project).

Signed-off-by: Stanislav Kinsbursky 
Cc: Serge Hallyn 
Cc: "Eric W. Biederman" 
Cc: Pavel Emelyanov 
Cc: Al Viro 
Cc: KOSAKI Motohiro 
Cc: Michael Kerrisk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: message queue receive cleanup

2013-01-05T00:11:45+00:00

Move all message related manipulation into one function msg_fill().
Actually, two functions because of the compat one.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Stanislav Kinsbursky 
Cc: Serge Hallyn 
Cc: "Eric W. Biederman" 
Cc: Pavel Emelyanov 
Cc: Al Viro 
Cc: KOSAKI Motohiro 
Cc: Michael Kerrisk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: use Kconfig options for __ARCH_WANT_[COMPAT_]IPC_PARSE_VERSION

2012-07-31T00:25:21+00:00

Rather than #define the options manually in the architecture code, add
Kconfig options for them and select them there instead.  This also allows
us to select the compat IPC version parsing automatically for platforms
using the old compat IPC interface.

Reported-by: Andrew Morton 
Signed-off-by: Will Deacon 
Cc: Arnd Bergmann 
Cc: Chris Metcalf 
Cc: Catalin Marinas 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: compat: use signed size_t types for msgsnd and msgrcv

2012-07-31T00:25:21+00:00

The msgsnd and msgrcv system calls use size_t to represent the size of the
message being transferred.  POSIX states that values of msgsz greater than
SSIZE_MAX cause the result to be implementation-defined.  On Linux, this
equates to returning -EINVAL if (long) msgsz < 0.

For compat tasks where !CONFIG_ARCH_WANT_OLD_COMPAT_IPC and compat_size_t
is smaller than size_t, negative size values passed from userspace will be
interpreted as positive values by do_msg{rcv,snd} and will fail to exit
early with -EINVAL.

This patch changes the compat prototypes for msg{rcv,snd} so that the
message size is represented as a compat_ssize_t, which we cast to the
native ssize_t type for the core IPC code.

Cc: Arnd Bergmann 
Acked-by: Chris Metcalf 
Acked-by: Catalin Marinas 
Signed-off-by: Will Deacon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: allow compat IPC version field parsing if !ARCH_WANT_OLD_COMPAT_IPC

2012-07-31T00:25:21+00:00

Commit 48b25c43e6ee ("ipc: provide generic compat versions of IPC
syscalls") added a new ARCH_WANT_OLD_COMPAT_IPC config option for
architectures to select if their compat target requires the old IPC
syscall interface.

For architectures (such as AArch64) that do not require the internal
calling conventions provided by this option, but have a compat target
where the C library passes the IPC_64 flag explicitly,
compat_ipc_parse_version no longer strips out the flag before calling
the native system call implementation, resulting in unknown SHM/IPC
commands and -EINVAL being returned to userspace.

This patch separates the selection of the internal calling conventions
for the IPC syscalls from the version parsing, allowing architectures to
select __ARCH_WANT_COMPAT_IPC_PARSE_VERSION if they want to use version
parsing whilst retaining the newer syscall calling conventions.

Acked-by: Chris Metcalf 
Cc: Arnd Bergmann 
Acked-by: Catalin Marinas 
Signed-off-by: Will Deacon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: add COMPAT_SHMLBA support

2012-07-31T00:25:20+00:00

If the SHMLBA definition for a native task differs from the definition for
a compat task, the do_shmat() function would need to handle both.

This patch introduces COMPAT_SHMLBA, which is used by the compat shmat
syscall when calling the ipc code and allows architectures such as AArch64
(where the native SHMLBA is 64k but the compat (AArch32) definition is
16k) to provide the correct semantics for compat IPC system calls.

Cc: David S. Miller 
Cc: Chris Zankel 
Cc: Arnd Bergmann 
Acked-by: Catalin Marinas 
Signed-off-by: Will Deacon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds