From cd0ae1d395a8bfc208437ce612413e58f5137499 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Wed, 21 Jun 2017 19:23:18 +0200 Subject: s390/crash: Remove unused KEXEC_NOTE_BYTES After commmit 692f66f26a4c19 ("crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE") the KEXEC_NOTE_BYTES macro is not used anymore and for s390 we create the ELF header in the new kernel anyway. Therefore remove the macro. Reported-by: Xunlei Pang Reviewed-by: Mikhail Zaslonko Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/kexec.h | 18 ------------------ 1 file changed, 18 deletions(-) (limited to 'arch/s390') diff --git a/arch/s390/include/asm/kexec.h b/arch/s390/include/asm/kexec.h index 2f924bc..dccf24e 100644 --- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -41,24 +41,6 @@ /* The native architecture */ #define KEXEC_ARCH KEXEC_ARCH_S390 -/* - * Size for s390x ELF notes per CPU - * - * Seven notes plus zero note at the end: prstatus, fpregset, timer, - * tod_cmp, tod_reg, control regs, and prefix - */ -#define KEXEC_NOTE_BYTES \ - (ALIGN(sizeof(struct elf_note), 4) * 8 + \ - ALIGN(sizeof("CORE"), 4) * 7 + \ - ALIGN(sizeof(struct elf_prstatus), 4) + \ - ALIGN(sizeof(elf_fpregset_t), 4) + \ - ALIGN(sizeof(u64), 4) + \ - ALIGN(sizeof(u64), 4) + \ - ALIGN(sizeof(u32), 4) + \ - ALIGN(sizeof(u64) * 16, 4) + \ - ALIGN(sizeof(u32), 4) \ - ) - /* Provide a dummy definition to avoid build failures. */ static inline void crash_setup_regs(struct pt_regs *newregs, struct pt_regs *oldregs) { } -- cgit v1.1 From c46fc0424ced3fb71208e72bd597d91b9169a781 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Thu, 29 Jun 2017 11:38:11 +0200 Subject: s390/syscalls: Fix out of bounds arguments access Zorro reported following crash while having enabled syscall tracing (CONFIG_FTRACE_SYSCALLS): Unable to handle kernel pointer dereference at virtual ... Oops: 0011 [#1] SMP DEBUG_PAGEALLOC SNIP Call Trace: ([<000000000024d79c>] ftrace_syscall_enter+0xec/0x1d8) [<00000000001099c6>] do_syscall_trace_enter+0x236/0x2f8 [<0000000000730f1c>] sysc_tracesys+0x1a/0x32 [<000003fffcf946a2>] 0x3fffcf946a2 INFO: lockdep is turned off. Last Breaking-Event-Address: [<000000000022dd44>] rb_event_data+0x34/0x40 ---[ end trace 8c795f86b1b3f7b9 ]--- The crash happens in syscall_get_arguments function for syscalls with zero arguments, that will try to access first argument (args[0]) in event entry, but it's not allocated. Bail out of there are no arguments. Cc: stable@vger.kernel.org Reported-by: Zorro Lang Signed-off-by: Jiri Olsa Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/syscall.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/s390') diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h index 6ba0bf9..6bc941b 100644 --- a/arch/s390/include/asm/syscall.h +++ b/arch/s390/include/asm/syscall.h @@ -64,6 +64,12 @@ static inline void syscall_get_arguments(struct task_struct *task, { unsigned long mask = -1UL; + /* + * No arguments for this syscall, there's nothing to do. + */ + if (!n) + return; + BUG_ON(i + n > 6); #ifdef CONFIG_COMPAT if (test_tsk_thread_flag(task, TIF_31BIT)) -- cgit v1.1