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ipc: rename old-style shmctl/semctl/msgctl syscalls

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The behavior of these system calls is slightly different between
architectures, as determined by the CONFIG_ARCH_WANT_IPC_PARSE_VERSION
symbol. Most architectures that implement the split IPC syscalls don't set
that symbol and only get the modern version, but alpha, arm, microblaze,
mips-n32, mips-n64 and xtensa expect the caller to pass the IPC_64 flag.

For the architectures that so far only implement sys_ipc(), i.e. m68k,
mips-o32, powerpc, s390, sh, sparc, and x86-32, we want the new behavior
when adding the split syscalls, so we need to distinguish between the
two groups of architectures.

The method I picked for this distinction is to have a separate system call
entry point: sys_old_*ctl() now uses ipc_parse_version, while sys_*ctl()
does not. The system call tables of the five architectures are changed
accordingly.

As an additional benefit, we no longer need the configuration specific
definition for ipc_parse_version(), it always does the same thing now,
but simply won't get called on architectures with the modern interface.

A small downside is that on architectures that do set
ARCH_WANT_IPC_PARSE_VERSION, we now have an extra set of entry points
that are never called. They only add a few bytes of bloat, so it seems
better to keep them compared to adding yet another Kconfig symbol.
I considered adding new syscall numbers for the IPC_64 variants for
consistency, but decided against that for now.

Signed-off-by: Arnd Bergmann <[email protected]>
This commit is contained in:
Arnd Bergmann 2018-12-31 22:22:40 +01:00
commit 275f22148e
14 changed files with 137 additions and 62 deletions
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39
ipc/sem.c
View file

@ -1634,9 +1634,8 @@ out_up:
return err;
}
long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg)
static long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg, int version)
{
int version;
struct ipc_namespace *ns;
void __user *p = (void __user *)arg;
struct semid64_ds semid64;
@ -1645,7 +1644,6 @@ long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg)
if (semid < 0)
return -EINVAL;
version = ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;
switch (cmd) {
@ -1691,9 +1689,23 @@ long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg)
SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
{
return ksys_semctl(semid, semnum, cmd, arg);
return ksys_semctl(semid, semnum, cmd, arg, IPC_64);
}
#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg)
{
int version = ipc_parse_version(&cmd);
return ksys_semctl(semid, semnum, cmd, arg, version);
}
SYSCALL_DEFINE4(old_semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
{
return ksys_old_semctl(semid, semnum, cmd, arg);
}
#endif
#ifdef CONFIG_COMPAT
struct compat_semid_ds {
@ -1744,12 +1756,11 @@ static int copy_compat_semid_to_user(void __user *buf, struct semid64_ds *in,
}
}
long compat_ksys_semctl(int semid, int semnum, int cmd, int arg)
static long compat_ksys_semctl(int semid, int semnum, int cmd, int arg, int version)
{
void __user *p = compat_ptr(arg);
struct ipc_namespace *ns;
struct semid64_ds semid64;
int version = compat_ipc_parse_version(&cmd);
int err;
ns = current->nsproxy->ipc_ns;
@ -1792,8 +1803,22 @@ long compat_ksys_semctl(int semid, int semnum, int cmd, int arg)
COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
{
return compat_ksys_semctl(semid, semnum, cmd, arg);
return compat_ksys_semctl(semid, semnum, cmd, arg, IPC_64);
}
#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg)
{
int version = compat_ipc_parse_version(&cmd);
return compat_ksys_semctl(semid, semnum, cmd, arg, version);
}
COMPAT_SYSCALL_DEFINE4(old_semctl, int, semid, int, semnum, int, cmd, int, arg)
{
return compat_ksys_old_semctl(semid, semnum, cmd, arg);
}
#endif
#endif
/* If the task doesn't already have a undo_list, then allocate one