This is a stab at providing three new helpers for allocation size
calculation:
struct_size(), array_size(), and array3_size().
These are implemented on top of Rasmus's overflow checking functions. The
existing allocators are adjusted to use the more efficient overflow
checks as well.
While the tree-wide conversions continue to be largely unchanged,
I've updated their commit logs a bit with some more details on
rationale and options. Notably, while there are NO plans to replace
kmalloc_array() and kcalloc() with kmalloc(array_size(...),...) and
kzalloc(array_size(...),...), the treewide conversions only add the
new helpers, as making the ..._array() and ...calloc() conversions
balloons the Coccinelle script terribly (I haven't found a way to
make the replacement function name depend on the matched regular expression).
So, while nothing does:
kmalloc_array(a, b, ...) -> kmalloc(array_size(a, b), ...)
the treewide changes DO perform changes like this:
kmalloc(a * b, ...) -> kmalloc(array_size(a, b), ...)
It should also be noted that the treewide changes overlap with a few
recently reported "real" overflows, so these aren't theoretical fixes.
At the very least, I'd like to get the helpers and self-test landed in
the v4.18 merge window (coming right up!) since those are relatively
self-contained. If the treewide changes need adjustment we've got,
in theory, through the end of -rc2 to land those.
The series is also up here:
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=kspp/overflow/array_size
Thanks!
-Kees
Changes from v2:
- updated commit logs
- added full allocator test coverage to test_overflow.ko
Changes from v1:
- use explicit overflow helpers instead of array_size() helpers.
- drop early-checks for SIZE_MAX.
- protect devm_kmalloc()-family from addition overflow.
- added missing overflow.h includes.
- fixed 0-day issues in a few treewide manual conversions
Kees Cook (14):
lib: overflow: Report test failures
overflow.h: Add allocation size calculation helpers
lib: overflow: Add memory allocation overflow tests
mm: Use overflow helpers in kmalloc_array*()
mm: Use overflow helpers in kvmalloc()
device: Use overflow helpers for devm_kmalloc()
treewide: Use struct_size() for kmalloc()-family
treewide: Use struct_size() for vmalloc()-family
treewide: Use struct_size() for devm_kmalloc() and friends
treewide: Use array_size() for kmalloc()-family
treewide: Use array_size() for kmalloc()-family, leftovers
treewide: Use array_size() for vmalloc()
treewide: Use array_size() for devm_*alloc()-like
treewide: Use array_size() for devm_*alloc()-like, leftovers
Rasmus Villemoes (2):
compiler.h: enable builtin overflow checkers and add fallback code
lib: add runtime test of check_*_overflow functions
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net/ceph/osdmap.c | 2 +-
net/ceph/pagevec.c | 4 +-
net/core/dev.c | 3 +-
net/core/ethtool.c | 10 +-
net/dcb/dcbnl.c | 3 +-
net/dccp/ccids/ccid2.c | 3 +-
net/ieee802154/nl-phy.c | 2 +-
net/ipv4/fib_frontend.c | 2 +-
net/ipv4/route.c | 6 +-
net/ipv6/icmp.c | 3 +-
net/ipv6/ila/ila_xlat.c | 3 +-
net/ipv6/route.c | 2 +-
net/mac80211/chan.c | 3 +-
net/mac80211/main.c | 3 +-
net/mac80211/rc80211_minstrel.c | 5 +-
net/mac80211/rc80211_minstrel_ht.c | 6 +-
net/mac80211/scan.c | 2 +-
net/mac80211/util.c | 4 +-
net/netfilter/ipvs/ip_vs_conn.c | 2 +-
net/netfilter/nf_conntrack_proto.c | 3 +-
net/netfilter/nf_nat_core.c | 2 +-
net/netfilter/nf_tables_api.c | 4 +-
net/netfilter/nfnetlink_cthelper.c | 4 +-
net/netfilter/x_tables.c | 3 +-
net/netfilter/xt_dccp.c | 2 +-
net/netfilter/xt_recent.c | 3 +-
net/netlink/genetlink.c | 8 +-
net/netrom/af_netrom.c | 3 +-
net/openvswitch/datapath.c | 2 +-
net/openvswitch/vport.c | 2 +-
net/rds/ib.c | 2 +-
net/rds/info.c | 3 +-
net/rose/af_rose.c | 3 +-
net/rxrpc/rxkad.c | 2 +-
net/sched/sch_fq_codel.c | 7 +-
net/sched/sch_hhf.c | 8 +-
net/sctp/auth.c | 4 +-
net/sctp/endpointola.c | 4 +-
net/sctp/protocol.c | 3 +-
net/smc/smc_wr.c | 5 +-
net/sunrpc/auth_gss/auth_gss.c | 4 +-
net/sunrpc/auth_gss/gss_krb5_crypto.c | 2 +-
net/sunrpc/auth_gss/gss_rpc_upcall.c | 3 +-
net/sunrpc/cache.c | 2 +-
net/tipc/netlink_compat.c | 4 +-
net/wireless/nl80211.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
security/keys/trusted.c | 2 +-
security/selinux/ss/services.c | 2 +-
sound/core/pcm_compat.c | 2 +-
sound/core/pcm_native.c | 4 +-
sound/core/seq/seq_midi_emul.c | 3 +-
sound/core/vmaster.c | 4 +-
sound/firewire/dice/dice-transaction.c | 4 +-
sound/firewire/fireface/ff-protocol-ff400.c | 2 +-
sound/firewire/packets-buffer.c | 3 +-
sound/oss/dmasound/dmasound_core.c | 2 +-
sound/pci/cs46xx/cs46xx_lib.c | 6 +-
sound/pci/cs46xx/dsp_spos.c | 6 +-
sound/pci/ctxfi/ctatc.c | 25 +-
sound/pci/ctxfi/ctdaio.c | 3 +-
sound/pci/ctxfi/ctmixer.c | 5 +-
sound/pci/ctxfi/ctsrc.c | 2 +-
sound/pci/emu10k1/emufx.c | 6 +-
sound/pci/hda/hda_codec.c | 6 +-
sound/pci/hda/hda_proc.c | 2 +-
sound/pci/hda/patch_ca0132.c | 3 +-
sound/pci/trident/trident_main.c | 2 +-
sound/pci/via82xx.c | 3 +-
sound/pci/via82xx_modem.c | 3 +-
sound/pci/ymfpci/ymfpci_main.c | 2 +-
sound/soc/au1x/dbdma2.c | 2 +-
sound/soc/codecs/hdmi-codec.c | 3 +-
sound/soc/codecs/rt5645.c | 3 +-
sound/soc/codecs/wm8904.c | 4 +-
sound/soc/codecs/wm8958-dsp2.c | 16 +-
sound/soc/codecs/wm8994.c | 3 +-
sound/soc/codecs/wm_adsp.c | 2 +-
sound/soc/davinci/davinci-mcasp.c | 12 +-
sound/soc/generic/audio-graph-card.c | 6 +-
sound/soc/generic/audio-graph-scu-card.c | 6 +-
sound/soc/generic/simple-card.c | 9 +-
sound/soc/generic/simple-scu-card.c | 6 +-
sound/soc/img/img-i2s-in.c | 3 +-
sound/soc/img/img-i2s-out.c | 3 +-
sound/soc/intel/common/sst-ipc.c | 4 +-
sound/soc/intel/skylake/skl-topology.c | 10 +-
sound/soc/pxa/mmp-sspa.c | 4 +-
sound/soc/qcom/apq8016_sbc.c | 3 +-
sound/soc/rockchip/rk3399_gru_sound.c | 2 +-
sound/soc/sh/rcar/cmd.c | 2 +-
sound/soc/sh/rcar/core.c | 4 +-
sound/soc/sh/rcar/ctu.c | 2 +-
sound/soc/sh/rcar/dvc.c | 3 +-
sound/soc/sh/rcar/mix.c | 3 +-
sound/soc/sh/rcar/src.c | 3 +-
sound/soc/sh/rcar/ssi.c | 3 +-
sound/soc/sh/rcar/ssiu.c | 3 +-
sound/soc/soc-core.c | 10 +-
sound/soc/soc-dapm.c | 7 +-
sound/soc/soc-topology.c | 2 +-
sound/soc/uniphier/aio-cpu.c | 7 +-
sound/usb/6fire/pcm.c | 8 +-
sound/usb/caiaq/audio.c | 9 +-
sound/usb/format.c | 6 +-
sound/usb/line6/capture.c | 4 +-
sound/usb/line6/pcm.c | 4 +-
sound/usb/line6/playback.c | 4 +-
sound/usb/mixer.c | 3 +-
sound/usb/pcm.c | 2 +-
sound/usb/usx2y/usbusx2y.c | 2 +-
sound/usb/usx2y/usbusx2yaudio.c | 6 +-
tools/virtio/ringtest/ptr_ring.c | 2 +-
virt/kvm/arm/vgic/vgic-v4.c | 2 +-
1263 files changed, 4034 insertions(+), 2767 deletions(-)
create mode 100644 include/linux/overflow.h
create mode 100644 lib/test_overflow.c
--
2.17.0
