lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 9 Feb 2016 18:12:24 +0000 From: Stuart Yoder <stuart.yoder@....com> To: Robin Murphy <robin.murphy@....com>, "robh+dt@...nel.org" <robh+dt@...nel.org>, "frowand.list@...il.com" <frowand.list@...il.com>, "grant.likely@...aro.org" <grant.likely@...aro.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org> CC: "marc.zyngier@....com" <marc.zyngier@....com>, "mark.rutland@....com" <mark.rutland@....com>, "david.daney@...ium.com" <david.daney@...ium.com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> Subject: RE: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base > -----Original Message----- > From: Robin Murphy [mailto:robin.murphy@....com] > Sent: Tuesday, February 09, 2016 5:05 AM > To: robh+dt@...nel.org; frowand.list@...il.com; grant.likely@...aro.org; > devicetree@...r.kernel.org > Cc: marc.zyngier@....com; mark.rutland@....com; david.daney@...ium.com; Stuart Yoder > <stuart.yoder@....com>; linux-arm-kernel@...ts.infradead.org; linux- > kernel@...r.kernel.org; stable@...r.kernel.org > Subject: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base > > The existing msi-map code is fine for shifting the entire RID space > upwards, but attempting finer-grained remapping reveals a bug. It turns > out that we are mistakenly treating the msi-base part as an offset, not > as a new base to remap onto, so things get squiffy when rid-base is > nonzero. Fix this, and at the same time add a sanity check against > having msi-map-mask clash with a nonzero rid-base, as that's another > thing one can easily get wrong. > > CC: <stable@...r.kernel.org> > Signed-off-by: Robin Murphy <robin.murphy@....com> > --- > drivers/of/irq.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/of/irq.c b/drivers/of/irq.c > index 7ee21ae..e7bfc17 100644 > --- a/drivers/of/irq.c > +++ b/drivers/of/irq.c > @@ -635,6 +635,13 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node > **np, > msi_base = be32_to_cpup(msi_map + 2); > rid_len = be32_to_cpup(msi_map + 3); > > + if (rid_base & ~map_mask) { > + dev_err(parent_dev, > + "Invalid msi-map translation - msi-map-mask (0x%x) ignores rid- > base (0x%x)\n", > + map_mask, rid_base); > + return rid_out; > + } > + > msi_controller_node = of_find_node_by_phandle(phandle); > > matched = (masked_rid >= rid_base && > @@ -654,7 +661,7 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node > **np, > if (!matched) > return rid_out; > > - rid_out = masked_rid + msi_base; > + rid_out = masked_rid - rid_base + msi_base; > dev_dbg(dev, > "msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: > %08x, rid: %08x -> %08x\n", > dev_name(parent_dev), map_mask, rid_base, msi_base, > -- > 2.7.0.25.gfc10eb5.dirty Tested-by: Stuart Yoder <stuart.yoder@....com>
Powered by blists - more mailing lists