From 3eb0f5193b497083391aa05d35210d5645211eef Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 17 Apr 2018 15:26:37 -0500 Subject: 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" --- arch/arc/mm/fault.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/arc/mm') diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c index a0b7bd6d030d..b884bbd6f354 100644 --- a/arch/arc/mm/fault.c +++ b/arch/arc/mm/fault.c @@ -70,6 +70,8 @@ void do_page_fault(unsigned long address, struct pt_regs *regs) int write = regs->ecr_cause & ECR_C_PROTV_STORE; /* ST/EX */ unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + clear_siginfo(&info); + /* * We fault-in kernel-space virtual memory on-demand. The * 'reference' page table is init_mm.pgd. -- cgit v1.2.3