| Message ID | 148059559339.31612.16180464424786438715.stgit@warthog.procyon.org.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, 1 Dec 2016, David Howells wrote: > 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. > I can see how base addresses and IO ports are relevant, but the irq parameter changes below don't protect the kernel image AFAICT. What's the rationale for those changes? I think it should be stated here. > 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/scsi/. > > Suggested-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> > Signed-off-by: David Howells <dhowells@redhat.com> > cc: "Juergen E. Fischer" <fischer@norbit.de> > cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> > cc: "Martin K. Petersen" <martin.petersen@oracle.com> > cc: Dario Ballabio <ballabio_dario@emc.com> > cc: Finn Thain <fthain@telegraphics.com.au> > cc: Michael Schmitz <schmitzmic@gmail.com> > cc: Achim Leubner <achim_leubner@adaptec.com> > cc: linux-scsi@vger.kernel.org > --- > > drivers/scsi/aha152x.c | 4 ++-- > drivers/scsi/aha1542.c | 2 +- > drivers/scsi/g_NCR5380.c | 8 ++++---- > drivers/scsi/gdth.c | 2 +- > drivers/scsi/qlogicfas.c | 4 ++-- > 5 files changed, 10 insertions(+), 10 deletions(-) > > diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c > index f44d0487236e..ce5dc73d85bb 100644 > --- a/drivers/scsi/aha152x.c > +++ b/drivers/scsi/aha152x.c > @@ -331,11 +331,11 @@ MODULE_LICENSE("GPL"); > #if !defined(PCMCIA) > #if defined(MODULE) > static int io[] = {0, 0}; > -module_param_array(io, int, NULL, 0); > +module_param_hw_array(io, int, ioport, NULL, 0); > MODULE_PARM_DESC(io,"base io address of controller"); > > static int irq[] = {0, 0}; > -module_param_array(irq, int, NULL, 0); > +module_param_hw_array(irq, int, irq, NULL, 0); > MODULE_PARM_DESC(irq,"interrupt for controller"); > > static int scsiid[] = {7, 7}; > diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c > index 7db448ec8beb..a23cc9ac5acd 100644 > --- a/drivers/scsi/aha1542.c > +++ b/drivers/scsi/aha1542.c > @@ -31,7 +31,7 @@ module_param(isapnp, bool, 0); > MODULE_PARM_DESC(isapnp, "enable PnP support (default=1)"); > > static int io[MAXBOARDS] = { 0x330, 0x334, 0, 0 }; > -module_param_array(io, int, NULL, 0); > +module_param_hw_array(io, int, ioport, NULL, 0); > MODULE_PARM_DESC(io, "base IO address of controller (0x130,0x134,0x230,0x234,0x330,0x334, default=0x330,0x334)"); > > /* time AHA spends on the AT-bus during data transfer */ > diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c > index cbf010324c18..cf4fa7a2e738 100644 > --- a/drivers/scsi/g_NCR5380.c > +++ b/drivers/scsi/g_NCR5380.c > @@ -44,8 +44,8 @@ static int ncr_53c400; > static int ncr_53c400a; > static int dtc_3181e; > static int hp_c2502; > -module_param(ncr_irq, int, 0); > -module_param(ncr_addr, int, 0); > +module_param_hw(ncr_irq, int, irq, 0); > +module_param_hw(ncr_addr, int, ioport, 0); > module_param(ncr_5380, int, 0); > module_param(ncr_53c400, int, 0); > module_param(ncr_53c400a, int, 0); > @@ -53,11 +53,11 @@ module_param(dtc_3181e, int, 0); > module_param(hp_c2502, int, 0); > > static int irq[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; > -module_param_array(irq, int, NULL, 0); > +module_param_hw_array(irq, int, irq, NULL, 0); > MODULE_PARM_DESC(irq, "IRQ number(s)"); > > static int base[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; > -module_param_array(base, int, NULL, 0); > +module_param_hw_array(base, int, ioport, NULL, 0); > MODULE_PARM_DESC(base, "base address(es)"); > > static int card[] = { -1, -1, -1, -1, -1, -1, -1, -1 }; > diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c > index 0a767740bf02..4ec08fb2dfa8 100644 > --- a/drivers/scsi/gdth.c > +++ b/drivers/scsi/gdth.c > @@ -353,7 +353,7 @@ static int probe_eisa_isa = 0; > static int force_dma32 = 0; > > /* parameters for modprobe/insmod */ > -module_param_array(irq, int, NULL, 0); > +module_param_hw_array(irq, int, irq, NULL, 0); > module_param(disable, int, 0); > module_param(reserve_mode, int, 0); > module_param_array(reserve_list, int, NULL, 0); > diff --git a/drivers/scsi/qlogicfas.c b/drivers/scsi/qlogicfas.c > index 61cac87fb86f..840823b99e51 100644 > --- a/drivers/scsi/qlogicfas.c > +++ b/drivers/scsi/qlogicfas.c > @@ -137,8 +137,8 @@ static struct Scsi_Host *__qlogicfas_detect(struct scsi_host_template *host, > static struct qlogicfas408_priv *cards; > static int iobase[MAX_QLOGICFAS]; > static int irq[MAX_QLOGICFAS] = { [0 ... MAX_QLOGICFAS-1] = -1 }; > -module_param_array(iobase, int, NULL, 0); > -module_param_array(irq, int, NULL, 0); > +module_param_hw_array(iobase, int, ioport, NULL, 0); > +module_param_hw_array(irq, int, irq, NULL, 0); > MODULE_PARM_DESC(iobase, "I/O address"); > MODULE_PARM_DESC(irq, "IRQ"); > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
Finn Thain <fthain@telegraphics.com.au> wrote: > I can see how base addresses and IO ports are relevant, but the irq > parameter changes below don't protect the kernel image AFAICT. What's the > rationale for those changes? I think it should be stated here. Easier grepping for one. But I'm also currently preventing the changing of any hardware parameters. If a driver refuses to share an irq, you could use it to deprive another driver of the ability to get an irq at all. David -- 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/scsi/aha152x.c b/drivers/scsi/aha152x.c index f44d0487236e..ce5dc73d85bb 100644 --- a/drivers/scsi/aha152x.c +++ b/drivers/scsi/aha152x.c @@ -331,11 +331,11 @@ MODULE_LICENSE("GPL"); #if !defined(PCMCIA) #if defined(MODULE) static int io[] = {0, 0}; -module_param_array(io, int, NULL, 0); +module_param_hw_array(io, int, ioport, NULL, 0); MODULE_PARM_DESC(io,"base io address of controller"); static int irq[] = {0, 0}; -module_param_array(irq, int, NULL, 0); +module_param_hw_array(irq, int, irq, NULL, 0); MODULE_PARM_DESC(irq,"interrupt for controller"); static int scsiid[] = {7, 7}; diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c index 7db448ec8beb..a23cc9ac5acd 100644 --- a/drivers/scsi/aha1542.c +++ b/drivers/scsi/aha1542.c @@ -31,7 +31,7 @@ module_param(isapnp, bool, 0); MODULE_PARM_DESC(isapnp, "enable PnP support (default=1)"); static int io[MAXBOARDS] = { 0x330, 0x334, 0, 0 }; -module_param_array(io, int, NULL, 0); +module_param_hw_array(io, int, ioport, NULL, 0); MODULE_PARM_DESC(io, "base IO address of controller (0x130,0x134,0x230,0x234,0x330,0x334, default=0x330,0x334)"); /* time AHA spends on the AT-bus during data transfer */ diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index cbf010324c18..cf4fa7a2e738 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -44,8 +44,8 @@ static int ncr_53c400; static int ncr_53c400a; static int dtc_3181e; static int hp_c2502; -module_param(ncr_irq, int, 0); -module_param(ncr_addr, int, 0); +module_param_hw(ncr_irq, int, irq, 0); +module_param_hw(ncr_addr, int, ioport, 0); module_param(ncr_5380, int, 0); module_param(ncr_53c400, int, 0); module_param(ncr_53c400a, int, 0); @@ -53,11 +53,11 @@ module_param(dtc_3181e, int, 0); module_param(hp_c2502, int, 0); static int irq[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; -module_param_array(irq, int, NULL, 0); +module_param_hw_array(irq, int, irq, NULL, 0); MODULE_PARM_DESC(irq, "IRQ number(s)"); static int base[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; -module_param_array(base, int, NULL, 0); +module_param_hw_array(base, int, ioport, NULL, 0); MODULE_PARM_DESC(base, "base address(es)"); static int card[] = { -1, -1, -1, -1, -1, -1, -1, -1 }; diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c index 0a767740bf02..4ec08fb2dfa8 100644 --- a/drivers/scsi/gdth.c +++ b/drivers/scsi/gdth.c @@ -353,7 +353,7 @@ static int probe_eisa_isa = 0; static int force_dma32 = 0; /* parameters for modprobe/insmod */ -module_param_array(irq, int, NULL, 0); +module_param_hw_array(irq, int, irq, NULL, 0); module_param(disable, int, 0); module_param(reserve_mode, int, 0); module_param_array(reserve_list, int, NULL, 0); diff --git a/drivers/scsi/qlogicfas.c b/drivers/scsi/qlogicfas.c index 61cac87fb86f..840823b99e51 100644 --- a/drivers/scsi/qlogicfas.c +++ b/drivers/scsi/qlogicfas.c @@ -137,8 +137,8 @@ static struct Scsi_Host *__qlogicfas_detect(struct scsi_host_template *host, static struct qlogicfas408_priv *cards; static int iobase[MAX_QLOGICFAS]; static int irq[MAX_QLOGICFAS] = { [0 ... MAX_QLOGICFAS-1] = -1 }; -module_param_array(iobase, int, NULL, 0); -module_param_array(irq, int, NULL, 0); +module_param_hw_array(iobase, int, ioport, NULL, 0); +module_param_hw_array(irq, int, irq, NULL, 0); MODULE_PARM_DESC(iobase, "I/O address"); MODULE_PARM_DESC(irq, "IRQ");
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/scsi/. Suggested-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> cc: "Juergen E. Fischer" <fischer@norbit.de> cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> cc: "Martin K. Petersen" <martin.petersen@oracle.com> cc: Dario Ballabio <ballabio_dario@emc.com> cc: Finn Thain <fthain@telegraphics.com.au> cc: Michael Schmitz <schmitzmic@gmail.com> cc: Achim Leubner <achim_leubner@adaptec.com> cc: linux-scsi@vger.kernel.org --- drivers/scsi/aha152x.c | 4 ++-- drivers/scsi/aha1542.c | 2 +- drivers/scsi/g_NCR5380.c | 8 ++++---- drivers/scsi/gdth.c | 2 +- drivers/scsi/qlogicfas.c | 4 ++-- 5 files changed, 10 insertions(+), 10 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