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authorEric W. Biederman <ebiederm@xmission.com>2018-04-17 15:26:37 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-04-25 10:40:51 -0500
commit3eb0f5193b497083391aa05d35210d5645211eef (patch)
tree65f009d4cdd5e407741a4431c0aacd40452779bd /arch/microblaze
parentf6ed1ecad56fec7ab5c6bf741064b95801e9688f (diff)
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>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/kernel/exceptions.c1
-rw-r--r--arch/microblaze/mm/fault.c4
2 files changed, 4 insertions, 1 deletions
diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c
index e6f338d0496b..443ec1feacb4 100644
--- a/arch/microblaze/kernel/exceptions.c
+++ b/arch/microblaze/kernel/exceptions.c
@@ -65,6 +65,7 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
if (kernel_mode(regs))
die("Exception in kernel mode", regs, signr);
+ clear_siginfo(&info);
info.si_signo = signr;
info.si_errno = 0;
info.si_code = code;
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index f91b30f8aaa8..43d92167012a 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -88,7 +88,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
- siginfo_t info;
int code = SEGV_MAPERR;
int is_write = error_code & ESR_S;
int fault;
@@ -295,6 +294,9 @@ out_of_memory:
do_sigbus:
up_read(&mm->mmap_sem);
if (user_mode(regs)) {
+ siginfo_t info;
+
+ clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;