netlabel: cope with NULL catmap (CVE-2020-10711)
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@ -9,6 +9,7 @@ linux (4.19.118-2+deb10u1) UNRELEASED; urgency=medium
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(CVE-2020-12768)
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* scsi: sg: add sg_remove_request in sg_write (CVE-2020-12770)
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* USB: gadget: fix illegal array access in binding with UDC (CVE-2020-13143)
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* netlabel: cope with NULL catmap (CVE-2020-10711)
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-- Salvatore Bonaccorso <carnil@debian.org> Thu, 28 May 2020 23:02:30 +0200
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@ -0,0 +1,92 @@
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From: Paolo Abeni <pabeni@redhat.com>
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Date: Tue, 12 May 2020 14:43:14 +0200
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Subject: netlabel: cope with NULL catmap
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Origin: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=caf6c20c6421ca687751d27b96c8021c655e56e6
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2020-10711
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[ Upstream commit eead1c2ea2509fd754c6da893a94f0e69e83ebe4 ]
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The cipso and calipso code can set the MLS_CAT attribute on
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successful parsing, even if the corresponding catmap has
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not been allocated, as per current configuration and external
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input.
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Later, selinux code tries to access the catmap if the MLS_CAT flag
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is present via netlbl_catmap_getlong(). That may cause null ptr
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dereference while processing incoming network traffic.
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Address the issue setting the MLS_CAT flag only if the catmap is
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really allocated. Additionally let netlbl_catmap_getlong() cope
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with NULL catmap.
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Reported-by: Matthew Sheets <matthew.sheets@gd-ms.com>
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Fixes: 4b8feff251da ("netlabel: fix the horribly broken catmap functions")
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Fixes: ceba1832b1b2 ("calipso: Set the calipso socket label to match the secattr.")
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Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Acked-by: Paul Moore <paul@paul-moore.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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net/ipv4/cipso_ipv4.c | 6 ++++--
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net/ipv6/calipso.c | 3 ++-
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net/netlabel/netlabel_kapi.c | 6 ++++++
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3 files changed, 12 insertions(+), 3 deletions(-)
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diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
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index 1c21dc5d6dd4..5535b722f66d 100644
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--- a/net/ipv4/cipso_ipv4.c
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+++ b/net/ipv4/cipso_ipv4.c
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@@ -1272,7 +1272,8 @@ static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def,
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return ret_val;
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}
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- secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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+ if (secattr->attr.mls.cat)
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+ secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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}
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return 0;
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@@ -1453,7 +1454,8 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
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return ret_val;
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}
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- secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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+ if (secattr->attr.mls.cat)
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+ secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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}
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return 0;
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diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
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index 1c0bb9fb76e6..70611784c071 100644
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--- a/net/ipv6/calipso.c
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+++ b/net/ipv6/calipso.c
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@@ -1061,7 +1061,8 @@ static int calipso_opt_getattr(const unsigned char *calipso,
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goto getattr_return;
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}
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- secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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+ if (secattr->attr.mls.cat)
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+ secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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}
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secattr->type = NETLBL_NLTYPE_CALIPSO;
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diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
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index ee3e5b6471a6..15fe2120b310 100644
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--- a/net/netlabel/netlabel_kapi.c
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+++ b/net/netlabel/netlabel_kapi.c
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@@ -748,6 +748,12 @@ int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
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if ((off & (BITS_PER_LONG - 1)) != 0)
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return -EINVAL;
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+ /* a null catmap is equivalent to an empty one */
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+ if (!catmap) {
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+ *offset = (u32)-1;
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+ return 0;
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+ }
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+
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if (off < catmap->startbit) {
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off = catmap->startbit;
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*offset = off;
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--
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2.27.0.rc0
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@ -306,5 +306,6 @@ bugfix/all/usb-core-fix-free-while-in-use-bug-in-the-usb-s-glib.patch
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bugfix/x86/kvm-svm-fix-potential-memory-leak-in-svm_cpu_init.patch
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bugfix/all/scsi-sg-add-sg_remove_request-in-sg_write.patch
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bugfix/all/usb-gadget-fix-illegal-array-access-in-binding-with-.patch
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bugfix/all/netlabel-cope-with-NULL-catmap.patch
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# ABI maintenance
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