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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 13 Feb 2018 07:46:59 -0800
From:   Reinette Chatre <>
        Reinette Chatre <>
Subject: [RFC PATCH V2 15/22] x86/intel_rdt: Prevent new allocations from pseudo-locked regions

When a user requests a new cache allocation we need to enforce that it
does not intersect with an existing pseudo-locked region. An allocation
with a bitmask intersection with a pseudo-locked region will enable
cache allocations to that region and thus evict pseudo-locked data.

Signed-off-by: Reinette Chatre <>
 arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
index 4a11aea3ad2c..4f823d631345 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
@@ -136,8 +136,10 @@ static bool cbm_validate(char *buf, unsigned long *data, struct rdt_resource *r)
- * Read one cache bit mask (hex). Check that it is valid for the current
- * resource type.
+ * Read one cache bit mask (hex). Check that it is valid and available for
+ * the current resource type. While CAT allows CBM to overlap amongst
+ * classes of service we do not allow a CBM to overlap with a region that has
+ * been pseudo-locked.
 int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d)
@@ -150,6 +152,8 @@ int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d)
 	if(!cbm_validate(buf, &data, r))
 		return -EINVAL;
+	if (cbm_pseudo_locked(data, d))
+		return -EINVAL;
 	d->new_ctrl = data;
 	d->have_new_ctrl = true;

Powered by blists - more mailing lists