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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/linkage.h>#include <linux/compat.h>#include <linux/errno.h>#include <linux/time.h>#include <linux/signal.h>#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */#include <linux/syscalls.h>#include <linux/unistd.h>#include <linux/security.h>#include <linux/export.h>#include <linux/migrate.h>#include <linux/posix-timers.h>#include <linux/times.h>#include <linux/ptrace.h>#include <linux/gfp.h>
#include <linux/uaccess.h>
#ifdef __ARCH_WANT_SYS_SIGPROCMASK
/* * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the * blocked set of signals to the supplied signal set */static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set){ memcpy(blocked->sig, &set, sizeof(set));}
COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, compat_old_sigset_t __user *, nset, compat_old_sigset_t __user *, oset){ old_sigset_t old_set, new_set; sigset_t new_blocked;
old_set = current->blocked.sig[0];
if (nset) { if (get_user(new_set, nset)) return -EFAULT; new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
new_blocked = current->blocked;
switch (how) { case SIG_BLOCK: sigaddsetmask(&new_blocked, new_set); break; case SIG_UNBLOCK: sigdelsetmask(&new_blocked, new_set); break; case SIG_SETMASK: compat_sig_setmask(&new_blocked, new_set); break; default: return -EINVAL; }
set_current_blocked(&new_blocked); }
if (oset) { if (put_user(old_set, oset)) return -EFAULT; }
return 0;}
#endif
int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru){ struct compat_rusage r32; memset(&r32, 0, sizeof(r32)); r32.ru_utime.tv_sec = r->ru_utime.tv_sec; r32.ru_utime.tv_usec = r->ru_utime.tv_usec; r32.ru_stime.tv_sec = r->ru_stime.tv_sec; r32.ru_stime.tv_usec = r->ru_stime.tv_usec; r32.ru_maxrss = r->ru_maxrss; r32.ru_ixrss = r->ru_ixrss; r32.ru_idrss = r->ru_idrss; r32.ru_isrss = r->ru_isrss; r32.ru_minflt = r->ru_minflt; r32.ru_majflt = r->ru_majflt; r32.ru_nswap = r->ru_nswap; r32.ru_inblock = r->ru_inblock; r32.ru_oublock = r->ru_oublock; r32.ru_msgsnd = r->ru_msgsnd; r32.ru_msgrcv = r->ru_msgrcv; r32.ru_nsignals = r->ru_nsignals; r32.ru_nvcsw = r->ru_nvcsw; r32.ru_nivcsw = r->ru_nivcsw; if (copy_to_user(ru, &r32, sizeof(r32))) return -EFAULT; return 0;}
static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, unsigned len, struct cpumask *new_mask){ unsigned long *k;
if (len < cpumask_size()) memset(new_mask, 0, cpumask_size()); else if (len > cpumask_size()) len = cpumask_size();
k = cpumask_bits(new_mask); return compat_get_bitmap(k, user_mask_ptr, len * 8);}
COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, unsigned int, len, compat_ulong_t __user *, user_mask_ptr){ cpumask_var_t new_mask; int retval;
if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) return -ENOMEM;
retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); if (retval) goto out;
retval = sched_setaffinity(pid, new_mask);out: free_cpumask_var(new_mask); return retval;}
COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, compat_ulong_t __user *, user_mask_ptr){ int ret; cpumask_var_t mask;
if ((len * BITS_PER_BYTE) < nr_cpu_ids) return -EINVAL; if (len & (sizeof(compat_ulong_t)-1)) return -EINVAL;
if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) return -ENOMEM;
ret = sched_getaffinity(pid, mask); if (ret == 0) { unsigned int retlen = min(len, cpumask_size());
if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) ret = -EFAULT; else ret = retlen; } free_cpumask_var(mask);
return ret;}
/* * We currently only need the following fields from the sigevent * structure: sigev_value, sigev_signo, sig_notify and (sometimes * sigev_notify_thread_id). The others are handled in user mode. * We also assume that copying sigev_value.sival_int is sufficient * to keep all the bits of sigev_value.sival_ptr intact. */int get_compat_sigevent(struct sigevent *event, const struct compat_sigevent __user *u_event){ memset(event, 0, sizeof(*event)); return (!access_ok(u_event, sizeof(*u_event)) || __get_user(event->sigev_value.sival_int, &u_event->sigev_value.sival_int) || __get_user(event->sigev_signo, &u_event->sigev_signo) || __get_user(event->sigev_notify, &u_event->sigev_notify) || __get_user(event->sigev_notify_thread_id, &u_event->sigev_notify_thread_id)) ? -EFAULT : 0;}
long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, unsigned long bitmap_size){ unsigned long nr_compat_longs;
/* align bitmap up to nearest compat_long_t boundary */ bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
if (!user_read_access_begin(umask, bitmap_size / 8)) return -EFAULT;
while (nr_compat_longs > 1) { compat_ulong_t l1, l2; unsafe_get_user(l1, umask++, Efault); unsafe_get_user(l2, umask++, Efault); *mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1; nr_compat_longs -= 2; } if (nr_compat_longs) unsafe_get_user(*mask, umask++, Efault); user_read_access_end(); return 0;
Efault: user_read_access_end(); return -EFAULT;}
long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, unsigned long bitmap_size){ unsigned long nr_compat_longs;
/* align bitmap up to nearest compat_long_t boundary */ bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
if (!user_write_access_begin(umask, bitmap_size / 8)) return -EFAULT;
while (nr_compat_longs > 1) { unsigned long m = *mask++; unsafe_put_user((compat_ulong_t)m, umask++, Efault); unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault); nr_compat_longs -= 2; } if (nr_compat_longs) unsafe_put_user((compat_ulong_t)*mask, umask++, Efault); user_write_access_end(); return 0;Efault: user_write_access_end(); return -EFAULT;}
intget_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat){#ifdef __BIG_ENDIAN compat_sigset_t v; if (copy_from_user(&v, compat, sizeof(compat_sigset_t))) return -EFAULT; switch (_NSIG_WORDS) { case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 ); fallthrough; case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 ); fallthrough; case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 ); fallthrough; case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 ); }#else if (copy_from_user(set, compat, sizeof(compat_sigset_t))) return -EFAULT;#endif return 0;}EXPORT_SYMBOL_GPL(get_compat_sigset);