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| author | Eric W. Biederman <ebiederm@xmission.com> | 2018-04-17 15:26:37 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-04-25 10:40:51 -0500 |
| commit | 3eb0f5193b497083391aa05d35210d5645211eef (patch) | |
| tree | 65f009d4cdd5e407741a4431c0aacd40452779bd /arch/openrisc | |
| parent | f6ed1ecad56fec7ab5c6bf741064b95801e9688f (diff) | |
| download | linux-3eb0f5193b497083391aa05d35210d5645211eef.tar.gz | |
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/openrisc')
| -rw-r--r-- | arch/openrisc/kernel/traps.c | 5 | ||||
| -rw-r--r-- | arch/openrisc/mm/fault.c | 1 |
2 files changed, 5 insertions, 1 deletions
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c index 113c175fe469..1610b1d65a11 100644 --- a/arch/openrisc/kernel/traps.c +++ b/arch/openrisc/kernel/traps.c @@ -251,7 +251,7 @@ void __init trap_init(void) asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) { siginfo_t info; - memset(&info, 0, sizeof(info)); + clear_siginfo(&info); info.si_signo = SIGTRAP; info.si_code = TRAP_TRACE; info.si_addr = (void *)address; @@ -266,6 +266,7 @@ asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) if (user_mode(regs)) { /* Send a SIGBUS */ + clear_siginfo(&info); info.si_signo = SIGBUS; info.si_errno = 0; info.si_code = BUS_ADRALN; @@ -285,6 +286,7 @@ asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address) if (user_mode(regs)) { /* Send a SIGBUS */ + clear_siginfo(&info); info.si_signo = SIGBUS; info.si_errno = 0; info.si_code = BUS_ADRERR; @@ -485,6 +487,7 @@ asmlinkage void do_illegal_instruction(struct pt_regs *regs, if (user_mode(regs)) { /* Send a SIGILL */ + clear_siginfo(&info); info.si_signo = SIGILL; info.si_errno = 0; info.si_code = ILL_ILLOPC; diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c index d0021dfae20a..68be33e4ae17 100644 --- a/arch/openrisc/mm/fault.c +++ b/arch/openrisc/mm/fault.c @@ -56,6 +56,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address, int fault; unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + clear_siginfo(&info); tsk = current; /* |