search for: set_tsk_thread_flag

...struct task_struct *p) +{ + if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, + IO_BITMAP_BYTES, GFP_KERNEL); + if (!p->thread.io_bitmap_ptr) { + p->thread.io_bitmap_max = 0; + return -ENOMEM; + } + set_tsk_thread_flag(p, TIF_IO_BITMAP); + } else { + p->thread.io_bitmap_ptr = NULL; + } + + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 884f98f..e86028b 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_3...

...(unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { > + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, > + IO_BITMAP_BYTES, GFP_KERNEL); > + if (!p->thread.io_bitmap_ptr) { > + p->thread.io_bitmap_max = 0; > + return -ENOMEM; > + } > + set_tsk_thread_flag(p, TIF_IO_BITMAP); > + } else { > + p->thread.io_bitmap_ptr = NULL; > + } > + > + return 0; > +} > + I really don't like the .h-file like this. Could you try avoiding it? I think it's possible to unify the copy_thread function and in the end move it to process.c in...

...(unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { > + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, > + IO_BITMAP_BYTES, GFP_KERNEL); > + if (!p->thread.io_bitmap_ptr) { > + p->thread.io_bitmap_max = 0; > + return -ENOMEM; > + } > + set_tsk_thread_flag(p, TIF_IO_BITMAP); > + } else { > + p->thread.io_bitmap_ptr = NULL; > + } > + > + return 0; > +} > + I really don't like the .h-file like this. Could you try avoiding it? I think it's possible to unify the copy_thread function and in the end move it to process.c in...

...struct task_struct *p) +{ + if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, + IO_BITMAP_BYTES, GFP_KERNEL); + if (!p->thread.io_bitmap_ptr) { + p->thread.io_bitmap_max = 0; + return -ENOMEM; + } + set_tsk_thread_flag(p, TIF_IO_BITMAP); + } else { + p->thread.io_bitmap_ptr = NULL; + } + + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 0de43e9..73a38c8 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_3...

...struct task_struct *p) +{ + if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, + IO_BITMAP_BYTES, GFP_KERNEL); + if (!p->thread.io_bitmap_ptr) { + p->thread.io_bitmap_max = 0; + return -ENOMEM; + } + set_tsk_thread_flag(p, TIF_IO_BITMAP); + } else { + p->thread.io_bitmap_ptr = NULL; + } + + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 0de43e9..73a38c8 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_3...

...struct task_struct *p) +{ + if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, + IO_BITMAP_BYTES, GFP_KERNEL); + if (!p->thread.io_bitmap_ptr) { + p->thread.io_bitmap_max = 0; + return -ENOMEM; + } + set_tsk_thread_flag(p, TIF_IO_BITMAP); + } else { + p->thread.io_bitmap_ptr = NULL; + } + + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 8f3ebfe..07550ff 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_3...

...struct task_struct *p) +{ + if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { + p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr, + IO_BITMAP_BYTES, GFP_KERNEL); + if (!p->thread.io_bitmap_ptr) { + p->thread.io_bitmap_max = 0; + return -ENOMEM; + } + set_tsk_thread_flag(p, TIF_IO_BITMAP); + } else { + p->thread.io_bitmap_ptr = NULL; + } + + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 8f3ebfe..07550ff 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_3...

This patch series makes it possible to compile out the userspace IO system calls, iopl and ioperm. The first patch does some 32/64 unification in copy_thread to make subsequent changes easier. The second patch simplifies the complex calculation of the TSS segment limit, which also makes it easier to change in the last patch. Patches 3-9 introduce helpers to make it easier to compile out IO.

This patch series makes it possible to compile out the userspace IO system calls, iopl and ioperm. The first patch does some 32/64 unification in copy_thread to make subsequent changes easier. The second patch simplifies the complex calculation of the TSS segment limit, which also makes it easier to change in the last patch. Patches 3-9 introduce helpers to make it easier to compile out IO.

This patch series makes it possible to compile out the iopl and ioperm system calls, which allow privileged processes to request permission to directly poke I/O ports from userspace. Nothing on a modern Linux system uses these calls anymore, and anything new should be using /dev/port instead, or better yet writing a driver. Copying the bloat-o-meter stats from the final patch: 32-bit

This patch series makes it possible to compile out the iopl and ioperm system calls, which allow privileged processes to request permission to directly poke I/O ports from userspace. Nothing on a modern Linux system uses these calls anymore, and anything new should be using /dev/port instead, or better yet writing a driver. Copying the bloat-o-meter stats from the final patch: 32-bit

...ff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 3b8f17c..7eb9adc 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -165,7 +165,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, p->thread.usersp = me->thread.usersp; set_tsk_thread_flag(p, TIF_FORK); p->thread.fpu_counter = 0; - p->thread.io_bitmap_ptr = NULL; + clear_thread_io_bitmap(p); savesegment(gs, p->thread.gsindex); p->thread.gs = p->thread.gsindex ? 0 : me->thread.gs; diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index 7461f50....

...00644 > --- a/arch/x86/kernel/process_64.c > +++ b/arch/x86/kernel/process_64.c > @@ -164,7 +164,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, > p->thread.sp = (unsigned long) childregs; > p->thread.usersp = me->thread.usersp; > set_tsk_thread_flag(p, TIF_FORK); > - p->thread.io_bitmap_ptr = NULL; > + clear_thread_io_bitmap(p); > > savesegment(gs, p->thread.gsindex); > p->thread.gs = p->thread.gsindex ? 0 : me->thread.gs; > diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptr...

...x86/kernel/process_64.c index b1babb4..d18f3fc 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -164,7 +164,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, p->thread.sp = (unsigned long) childregs; p->thread.usersp = me->thread.usersp; set_tsk_thread_flag(p, TIF_FORK); - p->thread.io_bitmap_ptr = NULL; + clear_thread_io_bitmap(p); savesegment(gs, p->thread.gsindex); p->thread.gs = p->thread.gsindex ? 0 : me->thread.gs; diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index 749b0e4..fdb74a8 100644 --- a/arch/x86/k...

...x86/kernel/process_64.c index b1babb4..d18f3fc 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -164,7 +164,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, p->thread.sp = (unsigned long) childregs; p->thread.usersp = me->thread.usersp; set_tsk_thread_flag(p, TIF_FORK); - p->thread.io_bitmap_ptr = NULL; + clear_thread_io_bitmap(p); savesegment(gs, p->thread.gsindex); p->thread.gs = p->thread.gsindex ? 0 : me->thread.gs; diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index 749b0e4..fdb74a8 100644 --- a/arch/x86/k...