diff options
| -rw-r--r-- | arch/x86/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/ioport.c (renamed from arch/x86/kernel/ioport_32.c) | 37 | ||||
| -rw-r--r-- | arch/x86/kernel/ioport_64.c | 117 |
3 files changed, 30 insertions, 126 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 3d23ccd366ea..c414c45a0f13 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -10,7 +10,7 @@ CFLAGS_vsyscall_64.o := $(PROFILING) -g0 obj-y := process_$(BITS).o signal_$(BITS).o entry_$(BITS).o obj-y += traps_$(BITS).o irq_$(BITS).o -obj-y += time_$(BITS).o ioport_$(BITS).o ldt.o +obj-y += time_$(BITS).o ioport.o ldt.o obj-y += setup_$(BITS).o i8259_$(BITS).o obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o diff --git a/arch/x86/kernel/ioport_32.c b/arch/x86/kernel/ioport.c index 9295e01ff49c..e723ff3b1d53 100644 --- a/arch/x86/kernel/ioport_32.c +++ b/arch/x86/kernel/ioport.c @@ -1,6 +1,6 @@ /* * This contains the io-permission bitmap code - written by obz, with changes - * by Linus. + * by Linus. 32/64 bits code unification by Miguel Botón. */ #include <linux/sched.h> @@ -36,7 +36,7 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) { struct thread_struct * t = ¤t->thread; struct tss_struct * tss; - unsigned long i, max_long; + unsigned int i, max_long, bytes, bytes_updated; if ((from + num <= from) || (from + num > IO_BITMAP_BITS)) return -EINVAL; @@ -79,8 +79,12 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) if (t->io_bitmap_ptr[i] != ~0UL) max_long = i; - t->io_bitmap_max = (max_long + 1) * sizeof(unsigned long); + bytes = (max_long + 1) * sizeof(unsigned long); + bytes_updated = max(bytes, t->io_bitmap_max); + t->io_bitmap_max = bytes; + +#ifdef CONFIG_X86_32 /* * Sets the lazy trigger so that the next I/O operation will * reload the correct bitmap. @@ -89,6 +93,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) */ tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET_LAZY; tss->io_bitmap_owner = NULL; +#else + /* Update the TSS: */ + memcpy(tss->io_bitmap, t->io_bitmap_ptr, bytes_updated); +#endif put_cpu(); @@ -105,13 +113,12 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) * on system-call entry - see also fork() and the signal handling * code. */ - +#ifdef CONFIG_X86_32 asmlinkage long sys_iopl(unsigned long regsp) { volatile struct pt_regs *regs = (struct pt_regs *)®sp; unsigned int level = regs->bx; unsigned int old = (regs->flags >> 12) & 3; - struct thread_struct *t = ¤t->thread; if (level > 3) return -EINVAL; @@ -120,10 +127,24 @@ asmlinkage long sys_iopl(unsigned long regsp) if (!capable(CAP_SYS_RAWIO)) return -EPERM; } + regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12); + + return 0; +} +#else +asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs) +{ + unsigned int old = (regs->flags >> 12) & 3; - t->iopl = level << 12; - regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | t->iopl; - set_iopl_mask(t->iopl); + if (level > 3) + return -EINVAL; + /* Trying to gain more privileges? */ + if (level > old) { + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + } + regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12); return 0; } +#endif diff --git a/arch/x86/kernel/ioport_64.c b/arch/x86/kernel/ioport_64.c deleted file mode 100644 index ff7514b757e5..000000000000 --- a/arch/x86/kernel/ioport_64.c +++ /dev/null @@ -1,117 +0,0 @@ -/* - * This contains the io-permission bitmap code - written by obz, with changes - * by Linus. - */ - -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/capability.h> -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/ioport.h> -#include <linux/smp.h> -#include <linux/stddef.h> -#include <linux/slab.h> -#include <linux/thread_info.h> -#include <linux/syscalls.h> - -/* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */ -static void set_bitmap(unsigned long *bitmap, unsigned int base, unsigned int extent, int new_value) -{ - int i; - if (new_value) - for (i = base; i < base + extent; i++) - __set_bit(i, bitmap); - else - for (i = base; i < base + extent; i++) - clear_bit(i, bitmap); -} - -/* - * this changes the io permissions bitmap in the current task. - */ -asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) -{ - unsigned int i, max_long, bytes, bytes_updated; - struct thread_struct * t = ¤t->thread; - struct tss_struct * tss; - unsigned long *bitmap; - - if ((from + num <= from) || (from + num > IO_BITMAP_BITS)) - return -EINVAL; - if (turn_on && !capable(CAP_SYS_RAWIO)) - return -EPERM; - - /* - * If it's the first ioperm() call in this thread's lifetime, set the - * IO bitmap up. ioperm() is much less timing critical than clone(), - * this is why we delay this operation until now: - */ - if (!t->io_bitmap_ptr) { - bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL); - if (!bitmap) - return -ENOMEM; - - memset(bitmap, 0xff, IO_BITMAP_BYTES); - t->io_bitmap_ptr = bitmap; - set_thread_flag(TIF_IO_BITMAP); - } - - /* - * do it in the per-thread copy and in the TSS ... - * - * Disable preemption via get_cpu() - we must not switch away - * because the ->io_bitmap_max value must match the bitmap - * contents: - */ - tss = &per_cpu(init_tss, get_cpu()); - - set_bitmap(t->io_bitmap_ptr, from, num, !turn_on); - - /* - * Search for a (possibly new) maximum. This is simple and stupid, - * to keep it obviously correct: - */ - max_long = 0; - for (i = 0; i < IO_BITMAP_LONGS; i++) - if (t->io_bitmap_ptr[i] != ~0UL) - max_long = i; - - bytes = (max_long + 1) * sizeof(long); - bytes_updated = max(bytes, t->io_bitmap_max); - - t->io_bitmap_max = bytes; - - /* Update the TSS: */ - memcpy(tss->io_bitmap, t->io_bitmap_ptr, bytes_updated); - - put_cpu(); - - return 0; -} - -/* - * sys_iopl has to be used when you want to access the IO ports - * beyond the 0x3ff range: to get the full 65536 ports bitmapped - * you'd need 8kB of bitmaps/process, which is a bit excessive. - * - * Here we just change the flags value on the stack: we allow - * only the super-user to do it. This depends on the stack-layout - * on system-call entry - see also fork() and the signal handling - * code. - */ - -asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs) -{ - unsigned int old = (regs->flags >> 12) & 3; - - if (level > 3) - return -EINVAL; - /* Trying to gain more privileges? */ - if (level > old) { - if (!capable(CAP_SYS_RAWIO)) - return -EPERM; - } - regs->flags = (regs->flags &~ X86_EFLAGS_IOPL) | (level << 12); - return 0; -} |