kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

generic sys_compat_rt_sigaction()

Browse source 
Again, protected by a temporary config symbol (GENERIC_COMPAT_RT_SIGACTION);
will be gone by the end of series.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-12-25 18:38:15 -05:00
parent 574c4866e3
commit 08d32fe504
3 changed files with 76 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/Kconfig
View file

@ -368,6 +368,9 @@ config GENERIC_COMPAT_RT_SIGPENDING
config GENERIC_COMPAT_RT_SIGQUEUEINFO
bool
config GENERIC_COMPAT_RT_SIGACTION
bool
#
# ABI hall of shame
#

24
include/linux/compat.h
View file

@ -142,6 +142,22 @@ typedef struct {
compat_sigset_word sig[_COMPAT_NSIG_WORDS];
} compat_sigset_t;
#ifdef CONFIG_GENERIC_COMPAT_RT_SIGACTION
struct compat_sigaction {
#ifndef __ARCH_HAS_ODD_SIGACTION
compat_uptr_t sa_handler;
compat_ulong_t sa_flags;
#else
compat_ulong_t sa_flags;
compat_uptr_t sa_handler;
#endif
#ifdef __ARCH_HAS_SA_RESTORER
compat_uptr_t sa_restorer;
#endif
compat_sigset_t sa_mask __packed;
};
#endif
/*
* These functions operate strictly on struct compat_time*
*/
@ -602,6 +618,14 @@ asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
compat_size_t sigsetsize);
#endif
#ifndef CONFIG_ODD_RT_SIGACTION
#ifdef CONFIG_GENERIC_COMPAT_RT_SIGACTION
asmlinkage long compat_sys_rt_sigaction(int,
const struct compat_sigaction __user *,
struct compat_sigaction __user *,
compat_size_t);
#endif
#endif
#ifdef CONFIG_GENERIC_COMPAT_RT_SIGQUEUEINFO
asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
struct compat_siginfo __user *uinfo);

49
kernel/signal.c
View file

@ -3358,6 +3358,55 @@ SYSCALL_DEFINE4(rt_sigaction, int, sig,
out:
return ret;
}
#ifdef CONFIG_COMPAT
#ifdef CONFIG_GENERIC_COMPAT_RT_SIGACTION
COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig,
const struct compat_sigaction __user *, act,
struct compat_sigaction __user *, oact,
compat_size_t, sigsetsize)
{
struct k_sigaction new_ka, old_ka;
compat_sigset_t mask;
#ifdef __ARCH_HAS_SA_RESTORER
compat_uptr_t restorer;
#endif
int ret;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (act) {
compat_uptr_t handler;
ret = get_user(handler, &act->sa_handler);
new_ka.sa.sa_handler = compat_ptr(handler);
#ifdef __ARCH_HAS_SA_RESTORER
ret |= get_user(restorer, &act->sa_restorer);
new_ka.sa.sa_restorer = compat_ptr(restorer);
#endif
ret |= copy_from_user(&mask, &act->sa_mask, sizeof(mask));
ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
if (ret)
return -EFAULT;
sigset_from_compat(&new_ka.sa.sa_mask, &mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
sigset_to_compat(&mask, &old_ka.sa.sa_mask);
ret = put_user(ptr_to_compat(old_ka.sa.sa_handler),
&oact->sa_handler);
ret |= copy_to_user(&oact->sa_mask, &mask, sizeof(mask));
ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
#ifdef __ARCH_HAS_SA_RESTORER
ret |= put_user(ptr_to_compat(old_ka.sa.sa_restorer),
&oact->sa_restorer);
#endif
}
return ret;
}
#endif
#endif
#endif /* !CONFIG_ODD_RT_SIGACTION */
#ifdef __ARCH_WANT_SYS_SGETMASK