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-rw-r--r--kernel/signal.c456
1 files changed, 292 insertions, 164 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 5843c541fda9..9a32bc2088c9 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -78,6 +78,10 @@ static bool sig_task_ignored(struct task_struct *t, int sig, bool force)
handler = sig_handler(t, sig);
+ /* SIGKILL and SIGSTOP may not be sent to the global init */
+ if (unlikely(is_global_init(t) && sig_kernel_only(sig)))
+ return true;
+
if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
handler == SIG_DFL && !(force && sig_kernel_only(sig)))
return true;
@@ -172,6 +176,7 @@ void recalc_sigpending(void)
clear_thread_flag(TIF_SIGPENDING);
}
+EXPORT_SYMBOL(recalc_sigpending);
void calculate_sigpending(void)
{
@@ -462,6 +467,7 @@ void flush_signals(struct task_struct *t)
flush_sigqueue(&t->signal->shared_pending);
spin_unlock_irqrestore(&t->sighand->siglock, flags);
}
+EXPORT_SYMBOL(flush_signals);
#ifdef CONFIG_POSIX_TIMERS
static void __flush_itimer_signals(struct sigpending *pending)
@@ -543,7 +549,7 @@ bool unhandled_signal(struct task_struct *tsk, int sig)
return !tsk->ptrace;
}
-static void collect_signal(int sig, struct sigpending *list, siginfo_t *info,
+static void collect_signal(int sig, struct sigpending *list, kernel_siginfo_t *info,
bool *resched_timer)
{
struct sigqueue *q, *first = NULL;
@@ -589,7 +595,7 @@ still_pending:
}
static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
- siginfo_t *info, bool *resched_timer)
+ kernel_siginfo_t *info, bool *resched_timer)
{
int sig = next_signal(pending, mask);
@@ -604,7 +610,7 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
*
* All callers have to hold the siglock.
*/
-int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
+int dequeue_signal(struct task_struct *tsk, sigset_t *mask, kernel_siginfo_t *info)
{
bool resched_timer = false;
int signr;
@@ -680,6 +686,7 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
#endif
return signr;
}
+EXPORT_SYMBOL_GPL(dequeue_signal);
/*
* Tell a process that it has a new active signal..
@@ -730,12 +737,12 @@ static void flush_sigqueue_mask(sigset_t *mask, struct sigpending *s)
}
}
-static inline int is_si_special(const struct siginfo *info)
+static inline int is_si_special(const struct kernel_siginfo *info)
{
- return info <= SEND_SIG_FORCED;
+ return info <= SEND_SIG_PRIV;
}
-static inline bool si_fromuser(const struct siginfo *info)
+static inline bool si_fromuser(const struct kernel_siginfo *info)
{
return info == SEND_SIG_NOINFO ||
(!is_si_special(info) && SI_FROMUSER(info));
@@ -760,7 +767,7 @@ static bool kill_ok_by_cred(struct task_struct *t)
* Bad permissions for sending the signal
* - the caller must hold the RCU read lock
*/
-static int check_kill_permission(int sig, struct siginfo *info,
+static int check_kill_permission(int sig, struct kernel_siginfo *info,
struct task_struct *t)
{
struct pid *sid;
@@ -885,7 +892,7 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force)
/*
* The first thread which returns from do_signal_stop()
* will take ->siglock, notice SIGNAL_CLD_MASK, and
- * notify its parent. See get_signal_to_deliver().
+ * notify its parent. See get_signal().
*/
signal_set_stop_flags(signal, why | SIGNAL_STOP_CONTINUED);
signal->group_stop_count = 0;
@@ -1003,7 +1010,7 @@ static inline bool legacy_queue(struct sigpending *signals, int sig)
}
#ifdef CONFIG_USER_NS
-static inline void userns_fixup_signal_uid(struct siginfo *info, struct task_struct *t)
+static inline void userns_fixup_signal_uid(struct kernel_siginfo *info, struct task_struct *t)
{
if (current_user_ns() == task_cred_xxx(t, user_ns))
return;
@@ -1017,13 +1024,13 @@ static inline void userns_fixup_signal_uid(struct siginfo *info, struct task_str
rcu_read_unlock();
}
#else
-static inline void userns_fixup_signal_uid(struct siginfo *info, struct task_struct *t)
+static inline void userns_fixup_signal_uid(struct kernel_siginfo *info, struct task_struct *t)
{
return;
}
#endif
-static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
+static int __send_signal(int sig, struct kernel_siginfo *info, struct task_struct *t,
enum pid_type type, int from_ancestor_ns)
{
struct sigpending *pending;
@@ -1035,7 +1042,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
result = TRACE_SIGNAL_IGNORED;
if (!prepare_signal(sig, t,
- from_ancestor_ns || (info == SEND_SIG_FORCED)))
+ from_ancestor_ns || (info == SEND_SIG_PRIV)))
goto ret;
pending = (type != PIDTYPE_PID) ? &t->signal->shared_pending : &t->pending;
@@ -1050,10 +1057,10 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
result = TRACE_SIGNAL_DELIVERED;
/*
- * fast-pathed signals for kernel-internal things like SIGSTOP
- * or SIGKILL.
+ * Skip useless siginfo allocation for SIGKILL SIGSTOP,
+ * and kernel threads.
*/
- if (info == SEND_SIG_FORCED)
+ if (sig_kernel_only(sig) || (t->flags & PF_KTHREAD))
goto out_set;
/*
@@ -1143,7 +1150,7 @@ ret:
return ret;
}
-static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
+static int send_signal(int sig, struct kernel_siginfo *info, struct task_struct *t,
enum pid_type type)
{
int from_ancestor_ns = 0;
@@ -1190,18 +1197,12 @@ static int __init setup_print_fatal_signals(char *str)
__setup("print-fatal-signals=", setup_print_fatal_signals);
int
-__group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
+__group_send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p)
{
return send_signal(sig, info, p, PIDTYPE_TGID);
}
-static int
-specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)
-{
- return send_signal(sig, info, t, PIDTYPE_PID);
-}
-
-int do_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
+int do_send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p,
enum pid_type type)
{
unsigned long flags;
@@ -1227,7 +1228,7 @@ int do_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
* that is why we also clear SIGNAL_UNKILLABLE.
*/
int
-force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
+force_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *t)
{
unsigned long int flags;
int ret, blocked, ignored;
@@ -1250,7 +1251,7 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
*/
if (action->sa.sa_handler == SIG_DFL && !t->ptrace)
t->signal->flags &= ~SIGNAL_UNKILLABLE;
- ret = specific_send_sig_info(sig, info, t);
+ ret = send_signal(sig, info, t, PIDTYPE_PID);
spin_unlock_irqrestore(&t->sighand->siglock, flags);
return ret;
@@ -1315,8 +1316,8 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
/*
* send signal info to all the members of a group
*/
-int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
- enum pid_type type)
+int group_send_sig_info(int sig, struct kernel_siginfo *info,
+ struct task_struct *p, enum pid_type type)
{
int ret;
@@ -1335,7 +1336,7 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
* control characters do (^C, ^Z etc)
* - the caller must hold at least a readlock on tasklist_lock
*/
-int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
+int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp)
{
struct task_struct *p = NULL;
int retval, success;
@@ -1350,7 +1351,7 @@ int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
return success ? 0 : retval;
}
-int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
+int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid)
{
int error = -ESRCH;
struct task_struct *p;
@@ -1372,7 +1373,7 @@ int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
}
}
-static int kill_proc_info(int sig, struct siginfo *info, pid_t pid)
+static int kill_proc_info(int sig, struct kernel_siginfo *info, pid_t pid)
{
int error;
rcu_read_lock();
@@ -1393,7 +1394,7 @@ static inline bool kill_as_cred_perm(const struct cred *cred,
}
/* like kill_pid_info(), but doesn't use uid/euid of "current" */
-int kill_pid_info_as_cred(int sig, struct siginfo *info, struct pid *pid,
+int kill_pid_info_as_cred(int sig, struct kernel_siginfo *info, struct pid *pid,
const struct cred *cred)
{
int ret = -EINVAL;
@@ -1437,7 +1438,7 @@ EXPORT_SYMBOL_GPL(kill_pid_info_as_cred);
* is probably wrong. Should make it like BSD or SYSV.
*/
-static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
+static int kill_something_info(int sig, struct kernel_siginfo *info, pid_t pid)
{
int ret;
@@ -1481,7 +1482,7 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
* These are for backward compatibility with the rest of the kernel source.
*/
-int send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
+int send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p)
{
/*
* Make sure legacy kernel users don't send in bad values
@@ -1492,6 +1493,7 @@ int send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
return do_send_sig_info(sig, info, p, PIDTYPE_PID);
}
+EXPORT_SYMBOL(send_sig_info);
#define __si_special(priv) \
((priv) ? SEND_SIG_PRIV : SEND_SIG_NOINFO)
@@ -1501,11 +1503,13 @@ send_sig(int sig, struct task_struct *p, int priv)
{
return send_sig_info(sig, __si_special(priv), p);
}
+EXPORT_SYMBOL(send_sig);
void force_sig(int sig, struct task_struct *p)
{
force_sig_info(sig, SEND_SIG_PRIV, p);
}
+EXPORT_SYMBOL(force_sig);
/*
* When things go south during signal handling, we
@@ -1529,7 +1533,7 @@ int force_sig_fault(int sig, int code, void __user *addr
___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)
, struct task_struct *t)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = sig;
@@ -1552,7 +1556,7 @@ int send_sig_fault(int sig, int code, void __user *addr
___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)
, struct task_struct *t)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = sig;
@@ -1572,7 +1576,7 @@ int send_sig_fault(int sig, int code, void __user *addr
int force_sig_mceerr(int code, void __user *addr, short lsb, struct task_struct *t)
{
- struct siginfo info;
+ struct kernel_siginfo info;
WARN_ON((code != BUS_MCEERR_AO) && (code != BUS_MCEERR_AR));
clear_siginfo(&info);
@@ -1586,7 +1590,7 @@ int force_sig_mceerr(int code, void __user *addr, short lsb, struct task_struct
int send_sig_mceerr(int code, void __user *addr, short lsb, struct task_struct *t)
{
- struct siginfo info;
+ struct kernel_siginfo info;
WARN_ON((code != BUS_MCEERR_AO) && (code != BUS_MCEERR_AR));
clear_siginfo(&info);
@@ -1601,7 +1605,7 @@ EXPORT_SYMBOL(send_sig_mceerr);
int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = SIGSEGV;
@@ -1616,7 +1620,7 @@ int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper)
#ifdef SEGV_PKUERR
int force_sig_pkuerr(void __user *addr, u32 pkey)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = SIGSEGV;
@@ -1633,7 +1637,7 @@ int force_sig_pkuerr(void __user *addr, u32 pkey)
*/
int force_sig_ptrace_errno_trap(int errno, void __user *addr)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
@@ -1762,7 +1766,7 @@ ret:
*/
bool do_notify_parent(struct task_struct *tsk, int sig)
{
- struct siginfo info;
+ struct kernel_siginfo info;
unsigned long flags;
struct sighand_struct *psig;
bool autoreap = false;
@@ -1867,7 +1871,7 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
static void do_notify_parent_cldstop(struct task_struct *tsk,
bool for_ptracer, int why)
{
- struct siginfo info;
+ struct kernel_siginfo info;
unsigned long flags;
struct task_struct *parent;
struct sighand_struct *sighand;
@@ -1967,7 +1971,7 @@ static bool sigkill_pending(struct task_struct *tsk)
* If we actually decide not to stop at all because the tracer
* is gone, we keep current->exit_code unless clear_code.
*/
-static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
+static void ptrace_stop(int exit_code, int why, int clear_code, kernel_siginfo_t *info)
__releases(&current->sighand->siglock)
__acquires(&current->sighand->siglock)
{
@@ -2104,7 +2108,7 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
static void ptrace_do_notify(int signr, int exit_code, int why)
{
- siginfo_t info;
+ kernel_siginfo_t info;
clear_siginfo(&info);
info.si_signo = signr;
@@ -2285,7 +2289,7 @@ static void do_jobctl_trap(void)
}
}
-static int ptrace_signal(int signr, siginfo_t *info)
+static int ptrace_signal(int signr, kernel_siginfo_t *info)
{
/*
* We do not check sig_kernel_stop(signr) but set this marker
@@ -2326,7 +2330,7 @@ static int ptrace_signal(int signr, siginfo_t *info)
/* If the (new) signal is now blocked, requeue it. */
if (sigismember(&current->blocked, signr)) {
- specific_send_sig_info(signr, info, current);
+ send_signal(signr, info, current, PIDTYPE_PID);
signr = 0;
}
@@ -2636,14 +2640,6 @@ out:
}
}
-EXPORT_SYMBOL(recalc_sigpending);
-EXPORT_SYMBOL_GPL(dequeue_signal);
-EXPORT_SYMBOL(flush_signals);
-EXPORT_SYMBOL(force_sig);
-EXPORT_SYMBOL(send_sig);
-EXPORT_SYMBOL(send_sig_info);
-EXPORT_SYMBOL(sigprocmask);
-
/*
* System call entry points.
*/
@@ -2737,6 +2733,7 @@ int sigprocmask(int how, sigset_t *set, sigset_t *oldset)
__set_current_blocked(&newset);
return 0;
}
+EXPORT_SYMBOL(sigprocmask);
/**
* sys_rt_sigprocmask - change the list of currently blocked signals
@@ -2847,27 +2844,48 @@ COMPAT_SYSCALL_DEFINE2(rt_sigpending, compat_sigset_t __user *, uset,
}
#endif
-enum siginfo_layout siginfo_layout(int sig, int si_code)
+static const struct {
+ unsigned char limit, layout;
+} sig_sicodes[] = {
+ [SIGILL] = { NSIGILL, SIL_FAULT },
+ [SIGFPE] = { NSIGFPE, SIL_FAULT },
+ [SIGSEGV] = { NSIGSEGV, SIL_FAULT },
+ [SIGBUS] = { NSIGBUS, SIL_FAULT },
+ [SIGTRAP] = { NSIGTRAP, SIL_FAULT },
+#if defined(SIGEMT)
+ [SIGEMT] = { NSIGEMT, SIL_FAULT },
+#endif
+ [SIGCHLD] = { NSIGCHLD, SIL_CHLD },
+ [SIGPOLL] = { NSIGPOLL, SIL_POLL },
+ [SIGSYS] = { NSIGSYS, SIL_SYS },
+};
+
+static bool known_siginfo_layout(unsigned sig, int si_code)
+{
+ if (si_code == SI_KERNEL)
+ return true;
+ else if ((si_code > SI_USER)) {
+ if (sig_specific_sicodes(sig)) {
+ if (si_code <= sig_sicodes[sig].limit)
+ return true;
+ }
+ else if (si_code <= NSIGPOLL)
+ return true;
+ }
+ else if (si_code >= SI_DETHREAD)
+ return true;
+ else if (si_code == SI_ASYNCNL)
+ return true;
+ return false;
+}
+
+enum siginfo_layout siginfo_layout(unsigned sig, int si_code)
{
enum siginfo_layout layout = SIL_KILL;
if ((si_code > SI_USER) && (si_code < SI_KERNEL)) {
- static const struct {
- unsigned char limit, layout;
- } filter[] = {
- [SIGILL] = { NSIGILL, SIL_FAULT },
- [SIGFPE] = { NSIGFPE, SIL_FAULT },
- [SIGSEGV] = { NSIGSEGV, SIL_FAULT },
- [SIGBUS] = { NSIGBUS, SIL_FAULT },
- [SIGTRAP] = { NSIGTRAP, SIL_FAULT },
-#if defined(SIGEMT) && defined(NSIGEMT)
- [SIGEMT] = { NSIGEMT, SIL_FAULT },
-#endif
- [SIGCHLD] = { NSIGCHLD, SIL_CHLD },
- [SIGPOLL] = { NSIGPOLL, SIL_POLL },
- [SIGSYS] = { NSIGSYS, SIL_SYS },
- };
- if ((sig < ARRAY_SIZE(filter)) && (si_code <= filter[sig].limit)) {
- layout = filter[sig].layout;
+ if ((sig < ARRAY_SIZE(sig_sicodes)) &&
+ (si_code <= sig_sicodes[sig].limit)) {
+ layout = sig_sicodes[sig].layout;
/* Handle the exceptions */
if ((sig == SIGBUS) &&
(si_code >= BUS_MCEERR_AR) && (si_code <= BUS_MCEERR_AO))
@@ -2892,22 +2910,69 @@ enum siginfo_layout siginfo_layout(int sig, int si_code)
return layout;
}
-int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from)
+static inline char __user *si_expansion(const siginfo_t __user *info)
+{
+ return ((char __user *)info) + sizeof(struct kernel_siginfo);
+}
+
+int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from)
{
- if (copy_to_user(to, from , sizeof(struct siginfo)))
+ char __user *expansion = si_expansion(to);
+ if (copy_to_user(to, from , sizeof(struct kernel_siginfo)))
+ return -EFAULT;
+ if (clear_user(expansion, SI_EXPANSION_SIZE))
return -EFAULT;
return 0;
}
+static int post_copy_siginfo_from_user(kernel_siginfo_t *info,
+ const siginfo_t __user *from)
+{
+ if (unlikely(!known_siginfo_layout(info->si_signo, info->si_code))) {
+ char __user *expansion = si_expansion(from);
+ char buf[SI_EXPANSION_SIZE];
+ int i;
+ /*
+ * An unknown si_code might need more than
+ * sizeof(struct kernel_siginfo) bytes. Verify all of the
+ * extra bytes are 0. This guarantees copy_siginfo_to_user
+ * will return this data to userspace exactly.
+ */
+ if (copy_from_user(&buf, expansion, SI_EXPANSION_SIZE))
+ return -EFAULT;
+ for (i = 0; i < SI_EXPANSION_SIZE; i++) {
+ if (buf[i] != 0)
+ return -E2BIG;
+ }
+ }
+ return 0;
+}
+
+static int __copy_siginfo_from_user(int signo, kernel_siginfo_t *to,
+ const siginfo_t __user *from)
+{
+ if (copy_from_user(to, from, sizeof(struct kernel_siginfo)))
+ return -EFAULT;
+ to->si_signo = signo;
+ return post_copy_siginfo_from_user(to, from);
+}
+
+int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from)
+{
+ if (copy_from_user(to, from, sizeof(struct kernel_siginfo)))
+ return -EFAULT;
+ return post_copy_siginfo_from_user(to, from);
+}
+
#ifdef CONFIG_COMPAT
int copy_siginfo_to_user32(struct compat_siginfo __user *to,
- const struct siginfo *from)
+ const struct kernel_siginfo *from)
#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
{
return __copy_siginfo_to_user32(to, from, in_x32_syscall());
}
int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
- const struct siginfo *from, bool x32_ABI)
+ const struct kernel_siginfo *from, bool x32_ABI)
#endif
{
struct compat_siginfo new;
@@ -2991,88 +3056,106 @@ int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
return 0;
}
-int copy_siginfo_from_user32(struct siginfo *to,
- const struct compat_siginfo __user *ufrom)
+static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
+ const struct compat_siginfo *from)
{
- struct compat_siginfo from;
-
- if (copy_from_user(&from, ufrom, sizeof(struct compat_siginfo)))
- return -EFAULT;
-
clear_siginfo(to);
- to->si_signo = from.si_signo;
- to->si_errno = from.si_errno;
- to->si_code = from.si_code;
- switch(siginfo_layout(from.si_signo, from.si_code)) {
+ to->si_signo = from->si_signo;
+ to->si_errno = from->si_errno;
+ to->si_code = from->si_code;
+ switch(siginfo_layout(from->si_signo, from->si_code)) {
case SIL_KILL:
- to->si_pid = from.si_pid;
- to->si_uid = from.si_uid;
+ to->si_pid = from->si_pid;
+ to->si_uid = from->si_uid;
break;
case SIL_TIMER:
- to->si_tid = from.si_tid;
- to->si_overrun = from.si_overrun;
- to->si_int = from.si_int;
+ to->si_tid = from->si_tid;
+ to->si_overrun = from->si_overrun;
+ to->si_int = from->si_int;
break;
case SIL_POLL:
- to->si_band = from.si_band;
- to->si_fd = from.si_fd;
+ to->si_band = from->si_band;
+ to->si_fd = from->si_fd;
break;
case SIL_FAULT:
- to->si_addr = compat_ptr(from.si_addr);
+ to->si_addr = compat_ptr(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- to->si_trapno = from.si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
break;
case SIL_FAULT_MCEERR:
- to->si_addr = compat_ptr(from.si_addr);
+ to->si_addr = compat_ptr(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- to->si_trapno = from.si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
- to->si_addr_lsb = from.si_addr_lsb;
+ to->si_addr_lsb = from->si_addr_lsb;
break;
case SIL_FAULT_BNDERR:
- to->si_addr = compat_ptr(from.si_addr);
+ to->si_addr = compat_ptr(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- to->si_trapno = from.si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
- to->si_lower = compat_ptr(from.si_lower);
- to->si_upper = compat_ptr(from.si_upper);
+ to->si_lower = compat_ptr(from->si_lower);
+ to->si_upper = compat_ptr(from->si_upper);
break;
case SIL_FAULT_PKUERR:
- to->si_addr = compat_ptr(from.si_addr);
+ to->si_addr = compat_ptr(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- to->si_trapno = from.si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
- to->si_pkey = from.si_pkey;
+ to->si_pkey = from->si_pkey;
break;
case SIL_CHLD:
- to->si_pid = from.si_pid;
- to->si_uid = from.si_uid;
- to->si_status = from.si_status;
+ to->si_pid = from->si_pid;
+ to->si_uid = from->si_uid;
+ to->si_status = from->si_status;
#ifdef CONFIG_X86_X32_ABI
if (in_x32_syscall()) {
- to->si_utime = from._sifields._sigchld_x32._utime;
- to->si_stime = from._sifields._sigchld_x32._stime;
+ to->si_utime = from->_sifields._sigchld_x32._utime;
+ to->si_stime = from->_sifields._sigchld_x32._stime;
} else
#endif
{
- to->si_utime = from.si_utime;
- to->si_stime = from.si_stime;
+ to->si_utime = from->si_utime;
+ to->si_stime = from->si_stime;
}
break;
case SIL_RT:
- to->si_pid = from.si_pid;
- to->si_uid = from.si_uid;
- to->si_int = from.si_int;
+ to->si_pid = from->si_pid;
+ to->si_uid = from->si_uid;
+ to->si_int = from->si_int;
break;
case SIL_SYS:
- to->si_call_addr = compat_ptr(from.si_call_addr);
- to->si_syscall = from.si_syscall;
- to->si_arch = from.si_arch;
+ to->si_call_addr = compat_ptr(from->si_call_addr);
+ to->si_syscall = from->si_syscall;
+ to->si_arch = from->si_arch;
break;
}
return 0;
}
+
+static int __copy_siginfo_from_user32(int signo, struct kernel_siginfo *to,
+ const struct compat_siginfo __user *ufrom)
+{
+ struct compat_siginfo from;
+
+ if (copy_from_user(&from, ufrom, sizeof(struct compat_siginfo)))
+ return -EFAULT;
+
+ from.si_signo = signo;
+ return post_copy_siginfo_from_user32(to, &from);
+}
+
+int copy_siginfo_from_user32(struct kernel_siginfo *to,
+ const struct compat_siginfo __user *ufrom)
+{
+ struct compat_siginfo from;
+
+ if (copy_from_user(&from, ufrom, sizeof(struct compat_siginfo)))
+ return -EFAULT;
+
+ return post_copy_siginfo_from_user32(to, &from);
+}
#endif /* CONFIG_COMPAT */
/**
@@ -3081,8 +3164,8 @@ int copy_siginfo_from_user32(struct siginfo *to,
* @info: if non-null, the signal's siginfo is returned here
* @ts: upper bound on process time suspension
*/
-static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
- const struct timespec *ts)
+static int do_sigtimedwait(const sigset_t *which, kernel_siginfo_t *info,
+ const struct timespec64 *ts)
{
ktime_t *to = NULL, timeout = KTIME_MAX;
struct task_struct *tsk = current;
@@ -3090,9 +3173,9 @@ static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
int sig, ret = 0;
if (ts) {
- if (!timespec_valid(ts))
+ if (!timespec64_valid(ts))
return -EINVAL;
- timeout = timespec_to_ktime(*ts);
+ timeout = timespec64_to_ktime(*ts);
to = &timeout;
}
@@ -3140,12 +3223,13 @@ static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
* @sigsetsize: size of sigset_t type
*/
SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
- siginfo_t __user *, uinfo, const struct timespec __user *, uts,
+ siginfo_t __user *, uinfo,
+ const struct __kernel_timespec __user *, uts,
size_t, sigsetsize)
{
sigset_t these;
- struct timespec ts;
- siginfo_t info;
+ struct timespec64 ts;
+ kernel_siginfo_t info;
int ret;
/* XXX: Don't preclude handling different sized sigset_t's. */
@@ -3156,7 +3240,7 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
return -EFAULT;
if (uts) {
- if (copy_from_user(&ts, uts, sizeof(ts)))
+ if (get_timespec64(&ts, uts))
return -EFAULT;
}
@@ -3173,11 +3257,11 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
struct compat_siginfo __user *, uinfo,
- struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
+ struct old_timespec32 __user *, uts, compat_size_t, sigsetsize)
{
sigset_t s;
- struct timespec t;
- siginfo_t info;
+ struct timespec64 t;
+ kernel_siginfo_t info;
long ret;
if (sigsetsize != sizeof(sigset_t))
@@ -3187,7 +3271,7 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
return -EFAULT;
if (uts) {
- if (compat_get_timespec(&t, uts))
+ if (get_old_timespec32(&t, uts))
return -EFAULT;
}
@@ -3209,7 +3293,7 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
*/
SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = sig;
@@ -3222,7 +3306,7 @@ SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
}
static int
-do_send_specific(pid_t tgid, pid_t pid, int sig, struct siginfo *info)
+do_send_specific(pid_t tgid, pid_t pid, int sig, struct kernel_siginfo *info)
{
struct task_struct *p;
int error = -ESRCH;
@@ -3253,7 +3337,7 @@ do_send_specific(pid_t tgid, pid_t pid, int sig, struct siginfo *info)
static int do_tkill(pid_t tgid, pid_t pid, int sig)
{
- struct siginfo info;
+ struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = sig;
@@ -3300,7 +3384,7 @@ SYSCALL_DEFINE2(tkill, pid_t, pid, int, sig)
return do_tkill(0, pid, sig);
}
-static int do_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t *info)
+static int do_rt_sigqueueinfo(pid_t pid, int sig, kernel_siginfo_t *info)
{
/* Not even root can pretend to send signals from the kernel.
* Nor can they impersonate a kill()/tgkill(), which adds source info.
@@ -3309,8 +3393,6 @@ static int do_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t *info)
(task_pid_vnr(current) != pid))
return -EPERM;
- info->si_signo = sig;
-
/* POSIX.1b doesn't mention process groups. */
return kill_proc_info(sig, info, pid);
}
@@ -3324,9 +3406,10 @@ static int do_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t *info)
SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,
siginfo_t __user *, uinfo)
{
- siginfo_t info;
- if (copy_from_user(&info, uinfo, sizeof(siginfo_t)))
- return -EFAULT;
+ kernel_siginfo_t info;
+ int ret = __copy_siginfo_from_user(sig, &info, uinfo);
+ if (unlikely(ret))
+ return ret;
return do_rt_sigqueueinfo(pid, sig, &info);
}
@@ -3336,15 +3419,15 @@ COMPAT_SYSCALL_DEFINE3(rt_sigqueueinfo,
int, sig,
struct compat_siginfo __user *, uinfo)
{
- siginfo_t info;
- int ret = copy_siginfo_from_user32(&info, uinfo);
+ kernel_siginfo_t info;
+ int ret = __copy_siginfo_from_user32(sig, &info, uinfo);
if (unlikely(ret))
return ret;
return do_rt_sigqueueinfo(pid, sig, &info);
}
#endif
-static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)
+static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, kernel_siginfo_t *info)
{
/* This is only valid for single tasks */
if (pid <= 0 || tgid <= 0)
@@ -3357,19 +3440,16 @@ static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)
(task_pid_vnr(current) != pid))
return -EPERM;
- info->si_signo = sig;
-
return do_send_specific(tgid, pid, sig, info);
}
SYSCALL_DEFINE4(rt_tgsigqueueinfo, pid_t, tgid, pid_t, pid, int, sig,
siginfo_t __user *, uinfo)
{
- siginfo_t info;
-
- if (copy_from_user(&info, uinfo, sizeof(siginfo_t)))
- return -EFAULT;
-
+ kernel_siginfo_t info;
+ int ret = __copy_siginfo_from_user(sig, &info, uinfo);
+ if (unlikely(ret))
+ return ret;
return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
}
@@ -3380,10 +3460,10 @@ COMPAT_SYSCALL_DEFINE4(rt_tgsigqueueinfo,
int, sig,
struct compat_siginfo __user *, uinfo)
{
- siginfo_t info;
-
- if (copy_siginfo_from_user32(&info, uinfo))
- return -EFAULT;
+ kernel_siginfo_t info;
+ int ret = __copy_siginfo_from_user32(sig, &info, uinfo);
+ if (unlikely(ret))
+ return ret;
return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
}
#endif
@@ -3460,7 +3540,8 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
}
static int
-do_sigaltstack (const stack_t *ss, stack_t *oss, unsigned long sp)
+do_sigaltstack (const stack_t *ss, stack_t *oss, unsigned long sp,
+ size_t min_ss_size)
{
struct task_struct *t = current;
@@ -3490,7 +3571,7 @@ do_sigaltstack (const stack_t *ss, stack_t *oss, unsigned long sp)
ss_size = 0;
ss_sp = NULL;
} else {
- if (unlikely(ss_size < MINSIGSTKSZ))
+ if (unlikely(ss_size < min_ss_size))
return -ENOMEM;
}
@@ -3508,7 +3589,8 @@ SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)
if (uss && copy_from_user(&new, uss, sizeof(stack_t)))
return -EFAULT;
err = do_sigaltstack(uss ? &new : NULL, uoss ? &old : NULL,
- current_user_stack_pointer());
+ current_user_stack_pointer(),
+ MINSIGSTKSZ);
if (!err && uoss && copy_to_user(uoss, &old, sizeof(stack_t)))
err = -EFAULT;
return err;
@@ -3519,7 +3601,8 @@ int restore_altstack(const stack_t __user *uss)
stack_t new;
if (copy_from_user(&new, uss, sizeof(stack_t)))
return -EFAULT;
- (void)do_sigaltstack(&new, NULL, current_user_stack_pointer());
+ (void)do_sigaltstack(&new, NULL, current_user_stack_pointer(),
+ MINSIGSTKSZ);
/* squash all but EFAULT for now */
return 0;
}
@@ -3553,7 +3636,8 @@ static int do_compat_sigaltstack(const compat_stack_t __user *uss_ptr,
uss.ss_size = uss32.ss_size;
}
ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss,
- compat_user_stack_pointer());
+ compat_user_stack_pointer(),
+ COMPAT_MINSIGSTKSZ);
if (ret >= 0 && uoss_ptr) {
compat_stack_t old;
memset(&old, 0, sizeof(old));
@@ -3962,13 +4046,57 @@ __weak const char *arch_vma_name(struct vm_area_struct *vma)
return NULL;
}
-void __init signals_init(void)
+static inline void siginfo_buildtime_checks(void)
{
- /* If this check fails, the __ARCH_SI_PREAMBLE_SIZE value is wrong! */
- BUILD_BUG_ON(__ARCH_SI_PREAMBLE_SIZE
- != offsetof(struct siginfo, _sifields._pad));
BUILD_BUG_ON(sizeof(struct siginfo) != SI_MAX_SIZE);
+ /* Verify the offsets in the two siginfos match */
+#define CHECK_OFFSET(field) \
+ BUILD_BUG_ON(offsetof(siginfo_t, field) != offsetof(kernel_siginfo_t, field))
+
+ /* kill */
+ CHECK_OFFSET(si_pid);
+ CHECK_OFFSET(si_uid);
+
+ /* timer */
+ CHECK_OFFSET(si_tid);
+ CHECK_OFFSET(si_overrun);
+ CHECK_OFFSET(si_value);
+
+ /* rt */
+ CHECK_OFFSET(si_pid);
+ CHECK_OFFSET(si_uid);
+ CHECK_OFFSET(si_value);
+
+ /* sigchld */
+ CHECK_OFFSET(si_pid);
+ CHECK_OFFSET(si_uid);
+ CHECK_OFFSET(si_status);
+ CHECK_OFFSET(si_utime);
+ CHECK_OFFSET(si_stime);
+
+ /* sigfault */
+ CHECK_OFFSET(si_addr);
+ CHECK_OFFSET(si_addr_lsb);
+ CHECK_OFFSET(si_lower);
+ CHECK_OFFSET(si_upper);
+ CHECK_OFFSET(si_pkey);
+
+ /* sigpoll */
+ CHECK_OFFSET(si_band);
+ CHECK_OFFSET(si_fd);
+
+ /* sigsys */
+ CHECK_OFFSET(si_call_addr);
+ CHECK_OFFSET(si_syscall);
+ CHECK_OFFSET(si_arch);
+#undef CHECK_OFFSET
+}
+
+void __init signals_init(void)
+{
+ siginfo_buildtime_checks();
+
sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.