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generic compat_sys_rt_sigprocmask() 

conditional on GENERIC_COMPAT_RT_SIGPROCMASK; by the end of that series
it will become the same thing as COMPAT and conditional will die out.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-12-25 13:32:58 -05:00
parent ad4b65a434
commit 322a56cb1f
4 changed files with 63 additions and 2 deletions
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3
arch/Kconfig
View File

@ -359,6 +359,9 @@ config MODULES_USE_ELF_REL
config GENERIC_SIGALTSTACK
bool
config GENERIC_COMPAT_RT_SIGPROCMASK
bool
#
# ABI hall of shame
#

8
include/linux/compat.h
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@ -401,7 +401,8 @@ asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
extern int compat_printk(const char *fmt, ...);
extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
extern void sigset_from_compat(sigset_t *set, const compat_sigset_t *compat);
extern void sigset_to_compat(compat_sigset_t *compat, const sigset_t *set);
asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
@ -592,6 +593,11 @@ asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
struct compat_timespec __user *uts, compat_size_t sigsetsize);
asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
compat_size_t sigsetsize);
#ifdef CONFIG_GENERIC_COMPAT_RT_SIGPROCMASK
asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
compat_sigset_t __user *oset,
compat_size_t sigsetsize);
#endif
asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
unsigned long arg);

13
kernel/compat.c
View File

@ -971,7 +971,7 @@ long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
}
void
sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
{
switch (_NSIG_WORDS) {
case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
@ -982,6 +982,17 @@ sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
}
EXPORT_SYMBOL_GPL(sigset_from_compat);
void
sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
{
switch (_NSIG_WORDS) {
case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
}
}
asmlinkage long
compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
struct compat_siginfo __user *uinfo,

41
kernel/signal.c
View File

@ -2613,6 +2613,47 @@ SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, nset,
return 0;
}
#ifdef CONFIG_COMPAT
#ifdef CONFIG_GENERIC_COMPAT_RT_SIGPROCMASK
COMPAT_SYSCALL_DEFINE4(rt_sigprocmask, int, how, compat_sigset_t __user *, nset,
compat_sigset_t __user *, oset, compat_size_t, sigsetsize)
{
#ifdef __BIG_ENDIAN
sigset_t old_set = current->blocked;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (nset) {
compat_sigset_t new32;
sigset_t new_set;
int error;
if (copy_from_user(&new32, nset, sizeof(compat_sigset_t)))
return -EFAULT;
sigset_from_compat(&new_set, &new32);
sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
error = sigprocmask(how, &new_set, NULL);
if (error)
return error;
}
if (oset) {
compat_sigset_t old32;
sigset_to_compat(&old32, &old_set);
if (copy_to_user(oset, &old_set, sizeof(sigset_t)))
return -EFAULT;
}
return 0;
#else
return sys_rt_sigprocmask(how, (sigset_t __user *)nset,
(sigset_t __user *)oset, sigsetsize);
#endif
}
#endif
#endif
long do_sigpending(void __user *set, unsigned long sigsetsize)
{
long error = -EINVAL;