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Date: Tue, 3 May 2022 18:44:28 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
David Howells <dhowells@...hat.com>,
Marc Dionne <marc.dionne@...istor.com>,
linux-afs@...ts.infradead.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 Göttsche <cgzones@...glemail.com>,
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 S. Miller" <davem@...emloft.net>,
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>,
Eric Paris <eparis@...isplace.org>,
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>,
Herbert Xu <herbert@...dor.apana.org.au>,
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>,
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John Keeping <john@...anate.com>,
Juergen Gross <jgross@...e.com>, Kalle Valo <kvalo@...nel.org>,
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kunit-dev@...glegroups.com,
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"K. Y. Srinivasan" <kys@...rosoft.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Lee Jones <lee.jones@...aro.org>,
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Liam Girdwood <lgirdwood@...il.com>,
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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>,
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>, netdev@...r.kernel.org,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nuno Sá <nuno.sa@...log.com>,
Paolo Abeni <pabeni@...hat.com>,
Paul Moore <paul@...l-moore.com>,
Rich Felker <dalias@...ifal.cx>,
Rob Herring <robh+dt@...nel.org>,
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"Serge E. Hallyn" <serge@...lyn.com>,
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Simon Horman <simon.horman@...igine.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Stefan Richter <stefanr@...6.in-berlin.de>,
Steffen Klassert <steffen.klassert@...unet.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Stephen Smalley <stephen.smalley.work@...il.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,
Xiu Jianfeng <xiujianfeng@...wei.com>,
Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 19/32] afs: Use mem_to_flex_dup() with struct afs_acl
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.
Cc: David Howells <dhowells@...hat.com>
Cc: Marc Dionne <marc.dionne@...istor.com>
Cc: linux-afs@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
fs/afs/internal.h | 4 ++--
fs/afs/xattr.c | 7 ++-----
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 7a72e9c60423..83014d20b6b3 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1125,8 +1125,8 @@ extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
extern void afs_fs_inline_bulk_status(struct afs_operation *);
struct afs_acl {
- u32 size;
- u8 data[];
+ DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(u32, size);
+ DECLARE_FLEX_ARRAY_ELEMENTS(u8, data);
};
extern void afs_fs_fetch_acl(struct afs_operation *);
diff --git a/fs/afs/xattr.c b/fs/afs/xattr.c
index 7751b0b3f81d..77b3af283d49 100644
--- a/fs/afs/xattr.c
+++ b/fs/afs/xattr.c
@@ -73,16 +73,13 @@ static int afs_xattr_get_acl(const struct xattr_handler *handler,
static bool afs_make_acl(struct afs_operation *op,
const void *buffer, size_t size)
{
- struct afs_acl *acl;
+ struct afs_acl *acl = NULL;
- acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL);
- if (!acl) {
+ if (mem_to_flex_dup(&acl, buffer, size, GFP_KERNEL)) {
afs_op_nomem(op);
return false;
}
- acl->size = size;
- memcpy(acl->data, buffer, size);
op->acl = acl;
return true;
}
--
2.32.0
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