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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 11:54:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 11:54:55 -0800
commit93f30c73ecd0281cf3685ef0e4e384980a176176 (patch)
treebd272334a0dbd258c08b5b2237e8bf5e17ce7255 /kernel
parent06ede5f6086757f746b7be860ae76137f4e95032 (diff)
parent96271654f55c74ff7325fbdfc535466c9deb0ce6 (diff)
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull compat and uaccess updates from Al Viro: - {get,put}_compat_sigset() series - assorted compat ioctl stuff - more set_fs() elimination - a few more timespec64 conversions - several removals of pointless access_ok() in places where it was followed only by non-__ variants of primitives * 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (24 commits) coredump: call do_unlinkat directly instead of sys_unlink fs: expose do_unlinkat for built-in callers ext4: take handling of EXT4_IOC_GROUP_ADD into a helper, get rid of set_fs() ipmi: get rid of pointless access_ok() pi433: sanitize ioctl cxlflash: get rid of pointless access_ok() mtdchar: get rid of pointless access_ok() r128: switch compat ioctls to drm_ioctl_kernel() selection: get rid of field-by-field copyin VT_RESIZEX: get rid of field-by-field copyin i2c compat ioctls: move to ->compat_ioctl() sched_rr_get_interval(): move compat to native, get rid of set_fs() mips: switch to {get,put}_compat_sigset() sparc: switch to {get,put}_compat_sigset() s390: switch to {get,put}_compat_sigset() ppc: switch to {get,put}_compat_sigset() parisc: switch to {get,put}_compat_sigset() get_compat_sigset() get rid of {get,put}_compat_itimerspec() io_getevents: Use timespec64 to represent timeouts ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/compat.c77
-rw-r--r--kernel/sched/core.c36
-rw-r--r--kernel/signal.c77
3 files changed, 83 insertions, 107 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 772e038d04d9..d1cee656a7ed 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -367,24 +367,6 @@ COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
return ret;
}
-int get_compat_itimerspec(struct itimerspec *dst,
- const struct compat_itimerspec __user *src)
-{
- if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
- __compat_get_timespec(&dst->it_value, &src->it_value))
- return -EFAULT;
- return 0;
-}
-
-int put_compat_itimerspec(struct compat_itimerspec __user *dst,
- const struct itimerspec *src)
-{
- if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
- __compat_put_timespec(&src->it_value, &dst->it_value))
- return -EFAULT;
- return 0;
-}
-
int get_compat_itimerspec64(struct itimerspec64 *its,
const struct compat_itimerspec __user *uits)
{
@@ -485,27 +467,44 @@ Efault:
return -EFAULT;
}
-void
-sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
+int
+get_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] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
- case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
- case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
- case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
+ case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
+ case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
+ case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
+ 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(sigset_from_compat);
+EXPORT_SYMBOL_GPL(get_compat_sigset);
-void
-sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
+int
+put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
+ unsigned int size)
{
+ /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
+#ifdef __BIG_ENDIAN
+ compat_sigset_t v;
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];
+ case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
+ case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
+ case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
+ case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
}
+ return copy_to_user(compat, &v, size) ? -EFAULT : 0;
+#else
+ return copy_to_user(compat, set, size) ? -EFAULT : 0;
+#endif
}
#ifdef CONFIG_NUMA
@@ -563,22 +562,6 @@ COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
}
#endif
-COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
- compat_pid_t, pid,
- struct compat_timespec __user *, interval)
-{
- struct timespec t;
- int ret;
- mm_segment_t old_fs = get_fs();
-
- set_fs(KERNEL_DS);
- ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
- set_fs(old_fs);
- if (compat_put_timespec(&t, interval))
- return -EFAULT;
- return ret;
-}
-
/*
* Allocate user-space memory for the duration of a single system call,
* in order to marshall parameters inside a compat thunk.
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a092f350f3a2..75554f366fd3 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -16,6 +16,7 @@
#include <linux/init_task.h>
#include <linux/context_tracking.h>
#include <linux/rcupdate_wait.h>
+#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/kprobes.h>
@@ -5107,13 +5108,11 @@ SYSCALL_DEFINE1(sched_get_priority_min, int, policy)
* Return: On success, 0 and the timeslice is in @interval. Otherwise,
* an error code.
*/
-SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
- struct timespec __user *, interval)
+static int sched_rr_get_interval(pid_t pid, struct timespec64 *t)
{
struct task_struct *p;
unsigned int time_slice;
struct rq_flags rf;
- struct timespec t;
struct rq *rq;
int retval;
@@ -5137,15 +5136,40 @@ SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
task_rq_unlock(rq, p, &rf);
rcu_read_unlock();
- jiffies_to_timespec(time_slice, &t);
- retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;
- return retval;
+ jiffies_to_timespec64(time_slice, t);
+ return 0;
out_unlock:
rcu_read_unlock();
return retval;
}
+SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
+ struct timespec __user *, interval)
+{
+ struct timespec64 t;
+ int retval = sched_rr_get_interval(pid, &t);
+
+ if (retval == 0)
+ retval = put_timespec64(&t, interval);
+
+ return retval;
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
+ compat_pid_t, pid,
+ struct compat_timespec __user *, interval)
+{
+ struct timespec64 t;
+ int retval = sched_rr_get_interval(pid, &t);
+
+ if (retval == 0)
+ retval = compat_put_timespec64(&t, interval);
+ return retval;
+}
+#endif
+
void sched_show_task(struct task_struct *p)
{
unsigned long free = 0;
diff --git a/kernel/signal.c b/kernel/signal.c
index aa1fb9f905db..babb36d3d039 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2599,7 +2599,6 @@ SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, nset,
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. */
@@ -2607,38 +2606,22 @@ COMPAT_SYSCALL_DEFINE4(rt_sigprocmask, int, how, compat_sigset_t __user *, nset,
return -EINVAL;
if (nset) {
- compat_sigset_t new32;
sigset_t new_set;
int error;
- if (copy_from_user(&new32, nset, sizeof(compat_sigset_t)))
+ if (get_compat_sigset(&new_set, nset))
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, &old32, sizeof(compat_sigset_t)))
- return -EFAULT;
- }
- return 0;
-#else
- return sys_rt_sigprocmask(how, (sigset_t __user *)nset,
- (sigset_t __user *)oset, sigsetsize);
-#endif
+ return oset ? put_compat_sigset(oset, &old_set, sizeof(*oset)) : 0;
}
#endif
-static int do_sigpending(void *set, unsigned long sigsetsize)
+static int do_sigpending(sigset_t *set)
{
- if (sigsetsize > sizeof(sigset_t))
- return -EINVAL;
-
spin_lock_irq(&current->sighand->siglock);
sigorsets(set, &current->pending.signal,
&current->signal->shared_pending.signal);
@@ -2658,7 +2641,12 @@ static int do_sigpending(void *set, unsigned long sigsetsize)
SYSCALL_DEFINE2(rt_sigpending, sigset_t __user *, uset, size_t, sigsetsize)
{
sigset_t set;
- int err = do_sigpending(&set, sigsetsize);
+ int err;
+
+ if (sigsetsize > sizeof(*uset))
+ return -EINVAL;
+
+ err = do_sigpending(&set);
if (!err && copy_to_user(uset, &set, sigsetsize))
err = -EFAULT;
return err;
@@ -2668,20 +2656,16 @@ SYSCALL_DEFINE2(rt_sigpending, sigset_t __user *, uset, size_t, sigsetsize)
COMPAT_SYSCALL_DEFINE2(rt_sigpending, compat_sigset_t __user *, uset,
compat_size_t, sigsetsize)
{
-#ifdef __BIG_ENDIAN
sigset_t set;
- int err = do_sigpending(&set, sigsetsize);
- if (!err) {
- compat_sigset_t set32;
- sigset_to_compat(&set32, &set);
- /* we can get here only if sigsetsize <= sizeof(set) */
- if (copy_to_user(uset, &set32, sigsetsize))
- err = -EFAULT;
- }
+ int err;
+
+ if (sigsetsize > sizeof(*uset))
+ return -EINVAL;
+
+ err = do_sigpending(&set);
+ if (!err)
+ err = put_compat_sigset(uset, &set, sigsetsize);
return err;
-#else
- return sys_rt_sigpending((sigset_t __user *)uset, sigsetsize);
-#endif
}
#endif
@@ -2915,7 +2899,6 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
struct compat_siginfo __user *, uinfo,
struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
{
- compat_sigset_t s32;
sigset_t s;
struct timespec t;
siginfo_t info;
@@ -2924,9 +2907,8 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
- if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
+ if (get_compat_sigset(&s, uthese))
return -EFAULT;
- sigset_from_compat(&s, &s32);
if (uts) {
if (compat_get_timespec(&t, uts))
@@ -3344,15 +3326,11 @@ SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, set)
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set32)
{
-#ifdef __BIG_ENDIAN
sigset_t set;
- int err = do_sigpending(&set, sizeof(set.sig[0]));
+ int err = do_sigpending(&set);
if (!err)
err = put_user(set.sig[0], set32);
return err;
-#else
- return sys_rt_sigpending((sigset_t __user *)set32, sizeof(*set32));
-#endif
}
#endif
@@ -3450,7 +3428,6 @@ COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig,
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
@@ -3468,19 +3445,18 @@ COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig,
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_compat_sigset(&new_ka.sa.sa_mask, &act->sa_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_compat_sigset(&oact->sa_mask, &old_ka.sa.sa_mask,
+ sizeof(oact->sa_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),
@@ -3660,22 +3636,15 @@ SYSCALL_DEFINE2(rt_sigsuspend, sigset_t __user *, unewset, size_t, sigsetsize)
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE2(rt_sigsuspend, compat_sigset_t __user *, unewset, compat_size_t, sigsetsize)
{
-#ifdef __BIG_ENDIAN
sigset_t newset;
- compat_sigset_t newset32;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
- if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
+ if (get_compat_sigset(&newset, unewset))
return -EFAULT;
- sigset_from_compat(&newset, &newset32);
return sigsuspend(&newset);
-#else
- /* on little-endian bitmaps don't care about granularity */
- return sys_rt_sigsuspend((sigset_t __user *)unewset, sigsetsize);
-#endif
}
#endif