signal: Ensure every siginfo we send has all bits initialized

Call clear_siginfo to ensure every stack allocated siginfo is properly
initialized before being passed to the signal sending functions.

Note: It is not safe to depend on C initializers to initialize struct
siginfo on the stack because C is allowed to skip holes when
initializing a structure.

The initialization of struct siginfo in tracehook_report_syscall_exit
was moved from the helper user_single_step_siginfo into
tracehook_report_syscall_exit itself, to make it clear that the local
variable siginfo gets fully initialized.

In a few cases the scope of struct siginfo has been reduced to make it
clear that siginfo siginfo is not used on other paths in the function
in which it is declared.

Instances of using memset to initialize siginfo have been replaced
with calls clear_siginfo for clarity.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 93faeca52284..b3ff0e8e5860 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -268,6 +268,7 @@ static noinline void do_sigsegv(struct pt_regs *regs, int si_code)
 	struct siginfo si;
 
 	report_user_fault(regs, SIGSEGV, 1);
+	clear_siginfo(&si);
 	si.si_signo = SIGSEGV;
 	si.si_errno = 0;
 	si.si_code = si_code;
@@ -323,6 +324,7 @@ static noinline void do_sigbus(struct pt_regs *regs)
 	 * Send a sigbus, regardless of whether we were in kernel
 	 * or user mode.
 	 */
+	clear_siginfo(&si);
 	si.si_signo = SIGBUS;
 	si.si_errno = 0;
 	si.si_code = BUS_ADRERR;