Commit 6f4d368e authored by Harvey Harrison's avatar Harvey Harrison Committed by Ingo Molnar
Browse files

x86: last of trivial fault_32|64.c unification



Comments, indentation, printk format.

Uses task_pid_nr() on X86_64 now, but this is always defined
to task->pid.
Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 608566b4
......@@ -36,10 +36,10 @@
* bit 3 == 1 means use of reserved bit detected
* bit 4 == 1 means fault was an instruction fetch
*/
#define PF_PROT (1<<0)
#define PF_PROT (1<<0)
#define PF_WRITE (1<<1)
#define PF_USER (1<<2)
#define PF_RSVD (1<<3)
#define PF_USER (1<<2)
#define PF_RSVD (1<<3)
#define PF_INSTR (1<<4)
static inline int notify_page_fault(struct pt_regs *regs)
......@@ -460,11 +460,15 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
printk_ratelimit()) {
printk("%s%s[%d]: segfault at %08lx ip %08lx "
"sp %08lx error %lx\n",
task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
tsk->comm, task_pid_nr(tsk), address, regs->ip,
regs->sp, error_code);
printk(
#ifdef CONFIG_X86_32
"%s%s[%d]: segfault at %08lx ip %08lx sp %08lx error %lx\n",
#else
"%s%s[%d]: segfault at %lx ip %lx sp %lx error %lx\n",
#endif
task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
tsk->comm, task_pid_nr(tsk), address, regs->ip,
regs->sp, error_code);
}
tsk->thread.cr2 = address;
/* Kernel addresses are always protection faults */
......
......@@ -440,8 +440,11 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
if (error_code & PF_USER) {
/* Allow userspace just enough access below the stack pointer
* to let the 'enter' instruction work.
/*
* Accessing the stack below %sp is always a bug.
* The large cushion allows instructions like enter
* and pusha to work. ("enter $65535,$31" pushes
* 32 pointers and then decrements %sp by 65535.)
*/
if (address + 65536 + 32 * sizeof(unsigned long) < regs->sp)
goto bad_area;
......@@ -522,10 +525,14 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
printk_ratelimit()) {
printk(
"%s%s[%d]: segfault at %lx ip %lx sp %lx error %lx\n",
tsk->pid > 1 ? KERN_INFO : KERN_EMERG,
tsk->comm, tsk->pid, address, regs->ip,
regs->sp, error_code);
#ifdef CONFIG_X86_32
"%s%s[%d]: segfault at %08lx ip %08lx sp %08lx error %lx\n",
#else
"%s%s[%d]: segfault at %lx ip %lx sp %lx error %lx\n",
#endif
task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
tsk->comm, task_pid_nr(tsk), address, regs->ip,
regs->sp, error_code);
}
tsk->thread.cr2 = address;
......@@ -609,10 +616,12 @@ LIST_HEAD(pgd_list);
void vmalloc_sync_all(void)
{
/* Note that races in the updates of insync and start aren't
problematic:
insync can only get set bits added, and updates to start are only
improving performance (without affecting correctness if undone). */
/*
* Note that races in the updates of insync and start aren't
* problematic: insync can only get set bits added, and updates to
* start are only improving performance (without affecting correctness
* if undone).
*/
static DECLARE_BITMAP(insync, PTRS_PER_PGD);
static unsigned long start = VMALLOC_START & PGDIR_MASK;
unsigned long address;
......
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