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Message-Id: <20220504014440.3697851-29-keescook@chromium.org>
Date: Tue, 3 May 2022 18:44:37 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
Steffen Klassert <steffen.klassert@...unet.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Paul Moore <paul@...l-moore.com>,
Stephen Smalley <stephen.smalley.work@...il.com>,
Eric Paris <eparis@...isplace.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Xiu Jianfeng <xiujianfeng@...wei.com>,
Christian Göttsche <cgzones@...glemail.com>,
netdev@...r.kernel.org, selinux@...r.kernel.org,
Alexei Starovoitov <ast@...nel.org>,
alsa-devel@...a-project.org, Al Viro <viro@...iv.linux.org.uk>,
Andrew Gabbasov <andrew_gabbasov@...tor.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Gross <agross@...nel.org>,
Andy Lavr <andy.lavr@...il.com>,
Arend van Spriel <aspriel@...il.com>,
Baowen Zheng <baowen.zheng@...igine.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Bradley Grove <linuxdrivers@...otech.com>,
brcm80211-dev-list.pdl@...adcom.com,
Christian Brauner <brauner@...nel.org>,
Christian Lamparter <chunkeey@...glemail.com>,
Chris Zankel <chris@...kel.net>,
Cong Wang <cong.wang@...edance.com>,
Daniel Axtens <dja@...ens.net>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Dan Williams <dan.j.williams@...el.com>,
David Gow <davidgow@...gle.com>,
David Howells <dhowells@...hat.com>,
Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
devicetree@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
Eli Cohen <elic@...dia.com>,
Eric Dumazet <edumazet@...gle.com>,
Eugeniu Rosca <erosca@...adit-jv.com>,
Felipe Balbi <balbi@...nel.org>,
Francis Laniel <laniel_francis@...vacyrequired.com>,
Frank Rowand <frowand.list@...il.com>,
Franky Lin <franky.lin@...adcom.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Gregory Greenman <gregory.greenman@...el.com>,
Guenter Roeck <linux@...ck-us.net>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Hante Meuleman <hante.meuleman@...adcom.com>,
Hulk Robot <hulkci@...wei.com>,
Jakub Kicinski <kuba@...nel.org>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
James Morris <jmorris@...ei.org>,
Jarkko Sakkinen <jarkko@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>,
Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
Johan Hedberg <johan.hedberg@...il.com>,
Johannes Berg <johannes.berg@...el.com>,
Johannes Berg <johannes@...solutions.net>,
John Keeping <john@...anate.com>,
Juergen Gross <jgross@...e.com>, Kalle Valo <kvalo@...nel.org>,
Keith Packard <keithp@...thp.com>, keyrings@...r.kernel.org,
kunit-dev@...glegroups.com,
Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Lee Jones <lee.jones@...aro.org>,
Leon Romanovsky <leon@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
linux1394-devel@...ts.sourceforge.net,
linux-afs@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org,
linux-hardening@...r.kernel.org, linux-hyperv@...r.kernel.org,
linux-integrity@...r.kernel.org, linux-rdma@...r.kernel.org,
linux-scsi@...r.kernel.org, linux-security-module@...r.kernel.org,
linux-usb@...r.kernel.org, linux-wireless@...r.kernel.org,
linux-xtensa@...ux-xtensa.org, llvm@...ts.linux.dev,
Loic Poulain <loic.poulain@...aro.org>,
Louis Peens <louis.peens@...igine.com>,
Luca Coelho <luciano.coelho@...el.com>,
Luiz Augusto von Dentz <luiz.dentz@...il.com>,
Marc Dionne <marc.dionne@...istor.com>,
Marcel Holtmann <marcel@...tmann.org>,
Mark Brown <broonie@...nel.org>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Max Filippov <jcmvbkbc@...il.com>,
Mimi Zohar <zohar@...ux.ibm.com>,
Muchun Song <songmuchun@...edance.com>,
Nathan Chancellor <nathan@...nel.org>,
Nuno Sá <nuno.sa@...log.com>,
Paolo Abeni <pabeni@...hat.com>,
Rich Felker <dalias@...ifal.cx>,
Rob Herring <robh+dt@...nel.org>,
Russell King <linux@...linux.org.uk>,
"Serge E. Hallyn" <serge@...lyn.com>,
SHA-cyfmac-dev-list@...ineon.com,
Simon Horman <simon.horman@...igine.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Stefan Richter <stefanr@...6.in-berlin.de>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Tadeusz Struk <tadeusz.struk@...aro.org>,
Takashi Iwai <tiwai@...e.com>, Tom Rix <trix@...hat.com>,
Udipto Goswami <quic_ugoswami@...cinc.com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
wcn36xx@...ts.infradead.org, Wei Liu <wei.liu@...nel.org>,
xen-devel@...ts.xenproject.org,
Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 28/32] selinux: Use mem_to_flex_dup() with xfrm and sidtab
As part of the work to perform bounds checking on all memcpy() uses,
replace the open-coded a deserialization of bytes out of memory into a
trailing flexible array by using a flex_array.h helper to perform the
allocation, bounds checking, and copying:
struct xfrm_sec_ctx
struct sidtab_str_cache
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Paul Moore <paul@...l-moore.com>
Cc: Stephen Smalley <stephen.smalley.work@...il.com>
Cc: Eric Paris <eparis@...isplace.org>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Xiu Jianfeng <xiujianfeng@...wei.com>
Cc: "Christian Göttsche" <cgzones@...glemail.com>
Cc: netdev@...r.kernel.org
Cc: selinux@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/uapi/linux/xfrm.h | 4 ++--
security/selinux/ss/sidtab.c | 9 +++------
security/selinux/xfrm.c | 7 ++-----
3 files changed, 7 insertions(+), 13 deletions(-)
diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
index 65e13a099b1a..4a6fa2beff6a 100644
--- a/include/uapi/linux/xfrm.h
+++ b/include/uapi/linux/xfrm.h
@@ -31,9 +31,9 @@ struct xfrm_id {
struct xfrm_sec_ctx {
__u8 ctx_doi;
__u8 ctx_alg;
- __u16 ctx_len;
+ __DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(__u16, ctx_len);
__u32 ctx_sid;
- char ctx_str[0];
+ __DECLARE_FLEX_ARRAY_ELEMENTS(char, ctx_str);
};
/* Security Context Domains of Interpretation */
diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
index a54b8652bfb5..a9d434e8cff7 100644
--- a/security/selinux/ss/sidtab.c
+++ b/security/selinux/ss/sidtab.c
@@ -23,8 +23,8 @@ struct sidtab_str_cache {
struct rcu_head rcu_member;
struct list_head lru_member;
struct sidtab_entry *parent;
- u32 len;
- char str[];
+ DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(u32, len);
+ DECLARE_FLEX_ARRAY_ELEMENTS(char, str);
};
#define index_to_sid(index) ((index) + SECINITSID_NUM + 1)
@@ -570,8 +570,7 @@ void sidtab_sid2str_put(struct sidtab *s, struct sidtab_entry *entry,
goto out_unlock;
}
- cache = kmalloc(struct_size(cache, str, str_len), GFP_ATOMIC);
- if (!cache)
+ if (mem_to_flex_dup(&cache, str, str_len, GFP_ATOMIC))
goto out_unlock;
if (s->cache_free_slots == 0) {
@@ -584,8 +583,6 @@ void sidtab_sid2str_put(struct sidtab *s, struct sidtab_entry *entry,
s->cache_free_slots--;
}
cache->parent = entry;
- cache->len = str_len;
- memcpy(cache->str, str, str_len);
list_add(&cache->lru_member, &s->cache_lru_list);
rcu_assign_pointer(entry->cache, cache);
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index c576832febc6..bc7a54bf8f0d 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -345,7 +345,7 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
struct xfrm_sec_ctx *polsec, u32 secid)
{
int rc;
- struct xfrm_sec_ctx *ctx;
+ struct xfrm_sec_ctx *ctx = NULL;
char *ctx_str = NULL;
u32 str_len;
@@ -360,8 +360,7 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
if (rc)
return rc;
- ctx = kmalloc(struct_size(ctx, ctx_str, str_len), GFP_ATOMIC);
- if (!ctx) {
+ if (mem_to_flex_dup(&ctx, ctx_str, str_len, GFP_ATOMIC)) {
rc = -ENOMEM;
goto out;
}
@@ -369,8 +368,6 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
ctx->ctx_doi = XFRM_SC_DOI_LSM;
ctx->ctx_alg = XFRM_SC_ALG_SELINUX;
ctx->ctx_sid = secid;
- ctx->ctx_len = str_len;
- memcpy(ctx->ctx_str, ctx_str, str_len);
x->security = ctx;
atomic_inc(&selinux_xfrm_refcount);
--
2.32.0
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