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authorEric W. Biederman <ebiederm@xmission.com>2018-01-05 17:27:42 -0600
committerEric W. Biederman <ebiederm@xmission.com>2018-01-12 14:21:07 -0600
commitfaf1f22b61f2715224ba9b579e2a983e99b86823 (patch)
treefb871c31027141a61c4e1d898d967df6baab025d /kernel/signal.c
parent8c5dbf2ae00bb8667f61c5edc6521c1fa2bbe4d7 (diff)
downloadlinux-faf1f22b61f2715224ba9b579e2a983e99b86823.tar.bz2
signal: Ensure generic siginfos the kernel sends have all bits initialized
Call clear_siginfo to ensure stack allocated siginfos are fully initialized before being passed to the signal sending functions. This ensures that if there is the kind of confusion documented by TRAP_FIXME, FPE_FIXME, or BUS_FIXME the kernel won't send unitialized data to userspace when the kernel generates a signal with SI_USER but the copy to userspace assumes it is a different kind of signal, and different fields are initialized. This also prepares the way for turning copy_siginfo_to_user into a copy_to_user, by removing the need in many cases to perform a field by field copy simply to skip the uninitialized fields. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index fd182a845490..241d54958bbb 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -549,6 +549,7 @@ still_pending:
* a fast-pathed signal or we must have been
* out of queue space. So zero out the info.
*/
+ clear_siginfo(info);
info->si_signo = sig;
info->si_errno = 0;
info->si_code = SI_USER;
@@ -1043,6 +1044,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
list_add_tail(&q->list, &pending->list);
switch ((unsigned long) info) {
case (unsigned long) SEND_SIG_NOINFO:
+ clear_siginfo(&q->info);
q->info.si_signo = sig;
q->info.si_errno = 0;
q->info.si_code = SI_USER;
@@ -1051,6 +1053,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
q->info.si_uid = from_kuid_munged(current_user_ns(), current_uid());
break;
case (unsigned long) SEND_SIG_PRIV:
+ clear_siginfo(&q->info);
q->info.si_signo = sig;
q->info.si_errno = 0;
q->info.si_code = SI_KERNEL;
@@ -1623,6 +1626,7 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
sig = SIGCHLD;
}
+ clear_siginfo(&info);
info.si_signo = sig;
info.si_errno = 0;
/*
@@ -1717,6 +1721,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk,
parent = tsk->real_parent;
}
+ clear_siginfo(&info);
info.si_signo = SIGCHLD;
info.si_errno = 0;
/*
@@ -1929,7 +1934,7 @@ static void ptrace_do_notify(int signr, int exit_code, int why)
{
siginfo_t info;
- memset(&info, 0, sizeof info);
+ clear_siginfo(&info);
info.si_signo = signr;
info.si_code = exit_code;
info.si_pid = task_pid_vnr(current);
@@ -2136,6 +2141,7 @@ static int ptrace_signal(int signr, siginfo_t *info)
* have updated *info via PTRACE_SETSIGINFO.
*/
if (signr != info->si_signo) {
+ clear_siginfo(info);
info->si_signo = signr;
info->si_errno = 0;
info->si_code = SI_USER;
@@ -2941,6 +2947,7 @@ SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
{
struct siginfo info;
+ clear_siginfo(&info);
info.si_signo = sig;
info.si_errno = 0;
info.si_code = SI_USER;