| Message ID | 149141152121.29162.4230904949695480240.stgit@warthog.procyon.org.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Em Wed, 05 Apr 2017 17:58:41 +0100 David Howells <dhowells@redhat.com> escreveu: > When the kernel is running in secure boot mode, we lock down the kernel to > prevent userspace from modifying the running kernel image. Whilst this > includes prohibiting access to things like /dev/mem, it must also prevent > access by means of configuring driver modules in such a way as to cause a > device to access or modify the kernel image. > > To this end, annotate module_param* statements that refer to hardware > configuration and indicate for future reference what type of parameter they > specify. The parameter parser in the core sees this information and can > skip such parameters with an error message if the kernel is locked down. > The module initialisation then runs as normal, but just sees whatever the > default values for those parameters is. > > Note that we do still need to do the module initialisation because some > drivers have viable defaults set in case parameters aren't specified and > some drivers support automatic configuration (e.g. PNP or PCI) in addition > to manually coded parameters. > > This patch annotates drivers in drivers/media/. > > Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> > Signed-off-by: David Howells <dhowells@redhat.com> > cc: Mauro Carvalho Chehab <mchehab@kernel.org> Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> > cc: mjpeg-users@lists.sourceforge.net > cc: linux-media@vger.kernel.org > --- > > drivers/media/pci/zoran/zoran_card.c | 2 +- > drivers/media/rc/serial_ir.c | 10 +++++----- > 2 files changed, 6 insertions(+), 6 deletions(-) > > diff --git a/drivers/media/pci/zoran/zoran_card.c b/drivers/media/pci/zoran/zoran_card.c > index 5266755add63..4680f001653a 100644 > --- a/drivers/media/pci/zoran/zoran_card.c > +++ b/drivers/media/pci/zoran/zoran_card.c > @@ -69,7 +69,7 @@ MODULE_PARM_DESC(card, "Card type"); > */ > > static unsigned long vidmem; /* default = 0 - Video memory base address */ > -module_param(vidmem, ulong, 0444); > +module_param_hw(vidmem, ulong, iomem, 0444); > MODULE_PARM_DESC(vidmem, "Default video memory base address"); > > /* > diff --git a/drivers/media/rc/serial_ir.c b/drivers/media/rc/serial_ir.c > index 41b54e40176c..40d305842a9b 100644 > --- a/drivers/media/rc/serial_ir.c > +++ b/drivers/media/rc/serial_ir.c > @@ -833,11 +833,11 @@ MODULE_LICENSE("GPL"); > module_param(type, int, 0444); > MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug"); > > -module_param(io, int, 0444); > +module_param_hw(io, int, ioport, 0444); > MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)"); > > /* some architectures (e.g. intel xscale) have memory mapped registers */ > -module_param(iommap, bool, 0444); > +module_param_hw(iommap, bool, other, 0444); > MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory mapped io)"); > > /* > @@ -845,13 +845,13 @@ MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory map > * on 32bit word boundaries. > * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out() > */ > -module_param(ioshift, int, 0444); > +module_param_hw(ioshift, int, other, 0444); > MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)"); > > -module_param(irq, int, 0444); > +module_param_hw(irq, int, irq, 0444); > MODULE_PARM_DESC(irq, "Interrupt (4 or 3)"); > > -module_param(share_irq, bool, 0444); > +module_param_hw(share_irq, bool, other, 0444); > MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)"); > > module_param(sense, int, 0444); > Thanks, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/media/pci/zoran/zoran_card.c b/drivers/media/pci/zoran/zoran_card.c index 5266755add63..4680f001653a 100644 --- a/drivers/media/pci/zoran/zoran_card.c +++ b/drivers/media/pci/zoran/zoran_card.c @@ -69,7 +69,7 @@ MODULE_PARM_DESC(card, "Card type"); */ static unsigned long vidmem; /* default = 0 - Video memory base address */ -module_param(vidmem, ulong, 0444); +module_param_hw(vidmem, ulong, iomem, 0444); MODULE_PARM_DESC(vidmem, "Default video memory base address"); /* diff --git a/drivers/media/rc/serial_ir.c b/drivers/media/rc/serial_ir.c index 41b54e40176c..40d305842a9b 100644 --- a/drivers/media/rc/serial_ir.c +++ b/drivers/media/rc/serial_ir.c @@ -833,11 +833,11 @@ MODULE_LICENSE("GPL"); module_param(type, int, 0444); MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug"); -module_param(io, int, 0444); +module_param_hw(io, int, ioport, 0444); MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)"); /* some architectures (e.g. intel xscale) have memory mapped registers */ -module_param(iommap, bool, 0444); +module_param_hw(iommap, bool, other, 0444); MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory mapped io)"); /* @@ -845,13 +845,13 @@ MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory map * on 32bit word boundaries. * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out() */ -module_param(ioshift, int, 0444); +module_param_hw(ioshift, int, other, 0444); MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)"); -module_param(irq, int, 0444); +module_param_hw(irq, int, irq, 0444); MODULE_PARM_DESC(irq, "Interrupt (4 or 3)"); -module_param(share_irq, bool, 0444); +module_param_hw(share_irq, bool, other, 0444); MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)"); module_param(sense, int, 0444);
When the kernel is running in secure boot mode, we lock down the kernel to prevent userspace from modifying the running kernel image. Whilst this includes prohibiting access to things like /dev/mem, it must also prevent access by means of configuring driver modules in such a way as to cause a device to access or modify the kernel image. To this end, annotate module_param* statements that refer to hardware configuration and indicate for future reference what type of parameter they specify. The parameter parser in the core sees this information and can skip such parameters with an error message if the kernel is locked down. The module initialisation then runs as normal, but just sees whatever the default values for those parameters is. Note that we do still need to do the module initialisation because some drivers have viable defaults set in case parameters aren't specified and some drivers support automatic configuration (e.g. PNP or PCI) in addition to manually coded parameters. This patch annotates drivers in drivers/media/. Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> cc: Mauro Carvalho Chehab <mchehab@kernel.org> cc: mjpeg-users@lists.sourceforge.net cc: linux-media@vger.kernel.org --- drivers/media/pci/zoran/zoran_card.c | 2 +- drivers/media/rc/serial_ir.c | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html