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Message-ID: <CAOfkYf7yk7L9oY0yt92DGb-HW=tp1-FE0tFr_=YmXKNFxaK68g@mail.gmail.com>
Date: Wed, 12 Jun 2019 02:35:28 +0530
From: Shyam Saini <mayhs11saini@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: Shyam Saini <shyam.saini@...rulasolutions.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org,
dri-devel <dri-devel@...ts.freedesktop.org>,
Network Development <netdev@...r.kernel.org>,
linux-ext4@...r.kernel.org, devel@...ts.orangefs.org,
linux-mm <linux-mm@...ck.org>, linux-sctp@...r.kernel.org,
bpf <bpf@...r.kernel.org>, kvm@...r.kernel.org,
William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH V2] include: linux: Regularise the use of FIELD_SIZEOF macro
Hi Kees,
Cc'ing William Kucharski,
> On Wed, Jun 12, 2019 at 01:08:36AM +0530, Shyam Saini wrote:
> > In favour of FIELD_SIZEOF, this patch also deprecates other two similar
> > macros sizeof_field and SIZEOF_FIELD.
> >
> > For code compatibility reason, retain sizeof_field macro as a wrapper macro
> > to FIELD_SIZEOF
>
> Can you explain this part? First sentence says you want to remove
> sizeof_field, and the second says you're keeping it? I thought the point
> was to switch all of these to FIELD_SIZEOF()?
Previously, William [1] suggested to retain sizeof_field as macro to
FIELD_SIZEOF
for code compatibility reason. I have removed all the usage of
sizeof_field apart from retained
wrapper macro definition.
[1] https://patchwork.ozlabs.org/patch/1085275/
Thanks,
Shyam
> >
> > arch/arm64/include/asm/processor.h | 10 +++++-----
> > arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 9 +--------
> > drivers/gpu/drm/i915/gvt/scheduler.c | 2 +-
> > drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++--
> > fs/befs/linuxvfs.c | 2 +-
> > fs/ext2/super.c | 2 +-
> > fs/ext4/super.c | 2 +-
> > fs/freevxfs/vxfs_super.c | 2 +-
> > fs/orangefs/super.c | 2 +-
> > fs/ufs/super.c | 2 +-
> > include/linux/kernel.h | 9 ---------
> > include/linux/slab.h | 2 +-
> > include/linux/stddef.h | 17 ++++++++++++++---
> > kernel/fork.c | 2 +-
> > kernel/utsname.c | 2 +-
> > net/caif/caif_socket.c | 2 +-
> > net/core/skbuff.c | 2 +-
> > net/ipv4/raw.c | 2 +-
> > net/ipv6/raw.c | 2 +-
> > net/sctp/socket.c | 4 ++--
> > tools/testing/selftests/bpf/bpf_util.h | 22 +++++++++++++++++++---
> > virt/kvm/kvm_main.c | 2 +-
> > 22 files changed, 58 insertions(+), 47 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
> > index fcd0e691b1ea..ace906d887cc 100644
> > --- a/arch/arm64/include/asm/processor.h
> > +++ b/arch/arm64/include/asm/processor.h
> > @@ -164,13 +164,13 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset,
> > unsigned long *size)
> > {
> > /* Verify that there is no padding among the whitelisted fields: */
> > - BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) !=
> > - sizeof_field(struct thread_struct, uw.tp_value) +
> > - sizeof_field(struct thread_struct, uw.tp2_value) +
> > - sizeof_field(struct thread_struct, uw.fpsimd_state));
> > + BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) !=
> > + FIELD_SIZEOF(struct thread_struct, uw.tp_value) +
> > + FIELD_SIZEOF(struct thread_struct, uw.tp2_value) +
> > + FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state));
> >
> > *offset = offsetof(struct thread_struct, uw);
> > - *size = sizeof_field(struct thread_struct, uw);
> > + *size = FIELD_SIZEOF(struct thread_struct, uw);
> > }
> >
> > #ifdef CONFIG_COMPAT
> > diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > index ba8f82a29a81..44b506a14666 100644
> > --- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > +++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > @@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
> > /* See header file for descriptions of functions */
> >
> > /**
> > - * This macro returns the size of a member of a structure.
> > - * Logically it is the same as "sizeof(s::field)" in C++, but
> > - * C lacks the "::" operator.
> > - */
> > -#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field)
> > -
> > -/**
> > * This macro returns a member of the
> > * cvmx_bootmem_named_block_desc_t structure. These members can't
> > * be directly addressed as they might be in memory not directly
> > @@ -65,7 +58,7 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
> > #define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \
> > __cvmx_bootmem_desc_get(addr, \
> > offsetof(struct cvmx_bootmem_named_block_desc, field), \
> > - SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field))
> > + FIELD_SIZEOF(struct cvmx_bootmem_named_block_desc, field))
> >
> > /**
> > * This function is the implementation of the get macros defined
> > diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
> > index 0f919f0a43d4..820f95a52542 100644
> > --- a/drivers/gpu/drm/i915/gvt/scheduler.c
> > +++ b/drivers/gpu/drm/i915/gvt/scheduler.c
> > @@ -1243,7 +1243,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
> > sizeof(struct intel_vgpu_workload), 0,
> > SLAB_HWCACHE_ALIGN,
> > offsetof(struct intel_vgpu_workload, rb_tail),
> > - sizeof_field(struct intel_vgpu_workload, rb_tail),
> > + FIELD_SIZEOF(struct intel_vgpu_workload, rb_tail),
> > NULL);
> >
> > if (!s->workloads) {
> > diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
> > index 46baf3b44309..c0447bf07fbb 100644
> > --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
> > +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
> > @@ -49,13 +49,13 @@ struct mlxsw_sp_fid_8021d {
> > };
> >
> > static const struct rhashtable_params mlxsw_sp_fid_ht_params = {
> > - .key_len = sizeof_field(struct mlxsw_sp_fid, fid_index),
> > + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, fid_index),
> > .key_offset = offsetof(struct mlxsw_sp_fid, fid_index),
> > .head_offset = offsetof(struct mlxsw_sp_fid, ht_node),
> > };
> >
> > static const struct rhashtable_params mlxsw_sp_fid_vni_ht_params = {
> > - .key_len = sizeof_field(struct mlxsw_sp_fid, vni),
> > + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, vni),
> > .key_offset = offsetof(struct mlxsw_sp_fid, vni),
> > .head_offset = offsetof(struct mlxsw_sp_fid, vni_ht_node),
> > };
> > diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
> > index 462d096ff3e9..06ffd4829e2e 100644
> > --- a/fs/befs/linuxvfs.c
> > +++ b/fs/befs/linuxvfs.c
> > @@ -438,7 +438,7 @@ befs_init_inodecache(void)
> > SLAB_ACCOUNT),
> > offsetof(struct befs_inode_info,
> > i_data.symlink),
> > - sizeof_field(struct befs_inode_info,
> > + FIELD_SIZEOF(struct befs_inode_info,
> > i_data.symlink),
> > init_once);
> > if (befs_inode_cachep == NULL)
> > diff --git a/fs/ext2/super.c b/fs/ext2/super.c
> > index 1d7ab73b1014..d9a6c81f4a47 100644
> > --- a/fs/ext2/super.c
> > +++ b/fs/ext2/super.c
> > @@ -220,7 +220,7 @@ static int __init init_inodecache(void)
> > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
> > SLAB_ACCOUNT),
> > offsetof(struct ext2_inode_info, i_data),
> > - sizeof_field(struct ext2_inode_info, i_data),
> > + FIELD_SIZEOF(struct ext2_inode_info, i_data),
> > init_once);
> > if (ext2_inode_cachep == NULL)
> > return -ENOMEM;
> > diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> > index 4079605d437a..b1b5856248bd 100644
> > --- a/fs/ext4/super.c
> > +++ b/fs/ext4/super.c
> > @@ -1148,7 +1148,7 @@ static int __init init_inodecache(void)
> > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
> > SLAB_ACCOUNT),
> > offsetof(struct ext4_inode_info, i_data),
> > - sizeof_field(struct ext4_inode_info, i_data),
> > + FIELD_SIZEOF(struct ext4_inode_info, i_data),
> > init_once);
> > if (ext4_inode_cachep == NULL)
> > return -ENOMEM;
> > diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c
> > index a89f68c3cbed..ffd22f85bbe0 100644
> > --- a/fs/freevxfs/vxfs_super.c
> > +++ b/fs/freevxfs/vxfs_super.c
> > @@ -329,7 +329,7 @@ vxfs_init(void)
> > sizeof(struct vxfs_inode_info), 0,
> > SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
> > offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
> > - sizeof_field(struct vxfs_inode_info,
> > + FIELD_SIZEOF(struct vxfs_inode_info,
> > vii_immed.vi_immed),
> > NULL);
> > if (!vxfs_inode_cachep)
> > diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
> > index ee5efdc35cc1..30f625059ad9 100644
> > --- a/fs/orangefs/super.c
> > +++ b/fs/orangefs/super.c
> > @@ -646,7 +646,7 @@ int orangefs_inode_cache_initialize(void)
> > ORANGEFS_CACHE_CREATE_FLAGS,
> > offsetof(struct orangefs_inode_s,
> > link_target),
> > - sizeof_field(struct orangefs_inode_s,
> > + FIELD_SIZEOF(struct orangefs_inode_s,
> > link_target),
> > orangefs_inode_cache_ctor);
> >
> > diff --git a/fs/ufs/super.c b/fs/ufs/super.c
> > index 3d247c0d92aa..1e8bcd950f6d 100644
> > --- a/fs/ufs/super.c
> > +++ b/fs/ufs/super.c
> > @@ -1469,7 +1469,7 @@ static int __init init_inodecache(void)
> > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
> > SLAB_ACCOUNT),
> > offsetof(struct ufs_inode_info, i_u1.i_symlink),
> > - sizeof_field(struct ufs_inode_info,
> > + FIELD_SIZEOF(struct ufs_inode_info,
> > i_u1.i_symlink),
> > init_once);
> > if (ufs_inode_cachep == NULL)
> > diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> > index 74b1ee9027f5..4672391cdb5b 100644
> > --- a/include/linux/kernel.h
> > +++ b/include/linux/kernel.h
> > @@ -79,15 +79,6 @@
> > */
> > #define round_down(x, y) ((x) & ~__round_mask(x, y))
> >
> > -/**
> > - * FIELD_SIZEOF - get the size of a struct's field
> > - * @t: the target struct
> > - * @f: the target struct's field
> > - * Return: the size of @f in the struct definition without having a
> > - * declared instance of @t.
> > - */
> > -#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
> > -
> > #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP
> >
> > #define DIV_ROUND_DOWN_ULL(ll, d) \
> > diff --git a/include/linux/slab.h b/include/linux/slab.h
> > index 9449b19c5f10..8bdfdd389b37 100644
> > --- a/include/linux/slab.h
> > +++ b/include/linux/slab.h
> > @@ -175,7 +175,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *);
> > sizeof(struct __struct), \
> > __alignof__(struct __struct), (__flags), \
> > offsetof(struct __struct, __field), \
> > - sizeof_field(struct __struct, __field), NULL)
> > + FIELD_SIZEOF(struct __struct, __field), NULL)
> >
> > /*
> > * Common kmalloc functions provided by all allocators
> > diff --git a/include/linux/stddef.h b/include/linux/stddef.h
> > index 998a4ba28eba..a5960e2b4a8b 100644
> > --- a/include/linux/stddef.h
> > +++ b/include/linux/stddef.h
> > @@ -20,12 +20,23 @@ enum {
> > #endif
> >
> > /**
> > - * sizeof_field(TYPE, MEMBER)
> > + * FIELD_SIZEOF - get the size of a struct's field
> > + * @t: the target struct
> > + * @f: the target struct's field
> > + * Return: the size of @f in the struct definition without having a
> > + * declared instance of @t.
> > + */
> > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f))
> > +
> > +/*
> > + * For code compatibility
> > *
> > + * sizeof_field(TYPE, MEMBER)
> > * @TYPE: The structure containing the field of interest
> > * @MEMBER: The field to return the size of
> > */
> > -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
> > +
> > +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER)
> >
> > /**
> > * offsetofend(TYPE, MEMBER)
> > @@ -34,6 +45,6 @@ enum {
> > * @MEMBER: The member within the structure to get the end offset of
> > */
> > #define offsetofend(TYPE, MEMBER) \
> > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
> > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER))
> >
> > #endif
> > diff --git a/kernel/fork.c b/kernel/fork.c
> > index 75675b9bf6df..ef40b95bf82c 100644
> > --- a/kernel/fork.c
> > +++ b/kernel/fork.c
> > @@ -2553,7 +2553,7 @@ void __init proc_caches_init(void)
> > mm_size, ARCH_MIN_MMSTRUCT_ALIGN,
> > SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
> > offsetof(struct mm_struct, saved_auxv),
> > - sizeof_field(struct mm_struct, saved_auxv),
> > + FIELD_SIZEOF(struct mm_struct, saved_auxv),
> > NULL);
> > vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT);
> > mmap_init();
> > diff --git a/kernel/utsname.c b/kernel/utsname.c
> > index f0e491193009..28257c571553 100644
> > --- a/kernel/utsname.c
> > +++ b/kernel/utsname.c
> > @@ -174,6 +174,6 @@ void __init uts_ns_init(void)
> > "uts_namespace", sizeof(struct uts_namespace), 0,
> > SLAB_PANIC|SLAB_ACCOUNT,
> > offsetof(struct uts_namespace, name),
> > - sizeof_field(struct uts_namespace, name),
> > + FIELD_SIZEOF(struct uts_namespace, name),
> > NULL);
> > }
> > diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
> > index 13ea920600ae..3306bbed77eb 100644
> > --- a/net/caif/caif_socket.c
> > +++ b/net/caif/caif_socket.c
> > @@ -1033,7 +1033,7 @@ static int caif_create(struct net *net, struct socket *sock, int protocol,
> > .owner = THIS_MODULE,
> > .obj_size = sizeof(struct caifsock),
> > .useroffset = offsetof(struct caifsock, conn_req.param),
> > - .usersize = sizeof_field(struct caifsock, conn_req.param)
> > + .usersize = FIELD_SIZEOF(struct caifsock, conn_req.param)
> > };
> >
> > if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> > index 47c1aa9ee045..816bea0c4a8e 100644
> > --- a/net/core/skbuff.c
> > +++ b/net/core/skbuff.c
> > @@ -3983,7 +3983,7 @@ void __init skb_init(void)
> > 0,
> > SLAB_HWCACHE_ALIGN|SLAB_PANIC,
> > offsetof(struct sk_buff, cb),
> > - sizeof_field(struct sk_buff, cb),
> > + FIELD_SIZEOF(struct sk_buff, cb),
> > NULL);
> > skbuff_fclone_cache = kmem_cache_create("skbuff_fclone_cache",
> > sizeof(struct sk_buff_fclones),
> > diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
> > index 0b8e06ca75d6..efa4c745f7b9 100644
> > --- a/net/ipv4/raw.c
> > +++ b/net/ipv4/raw.c
> > @@ -977,7 +977,7 @@ struct proto raw_prot = {
> > .unhash = raw_unhash_sk,
> > .obj_size = sizeof(struct raw_sock),
> > .useroffset = offsetof(struct raw_sock, filter),
> > - .usersize = sizeof_field(struct raw_sock, filter),
> > + .usersize = FIELD_SIZEOF(struct raw_sock, filter),
> > .h.raw_hash = &raw_v4_hashinfo,
> > #ifdef CONFIG_COMPAT
> > .compat_setsockopt = compat_raw_setsockopt,
> > diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
> > index 70693bc7ad9d..257c71e22d74 100644
> > --- a/net/ipv6/raw.c
> > +++ b/net/ipv6/raw.c
> > @@ -1292,7 +1292,7 @@ struct proto rawv6_prot = {
> > .unhash = raw_unhash_sk,
> > .obj_size = sizeof(struct raw6_sock),
> > .useroffset = offsetof(struct raw6_sock, filter),
> > - .usersize = sizeof_field(struct raw6_sock, filter),
> > + .usersize = FIELD_SIZEOF(struct raw6_sock, filter),
> > .h.raw_hash = &raw_v6_hashinfo,
> > #ifdef CONFIG_COMPAT
> > .compat_setsockopt = compat_rawv6_setsockopt,
> > diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> > index 39ea0a37af09..6b648a6033b9 100644
> > --- a/net/sctp/socket.c
> > +++ b/net/sctp/socket.c
> > @@ -9377,7 +9377,7 @@ struct proto sctp_prot = {
> > .useroffset = offsetof(struct sctp_sock, subscribe),
> > .usersize = offsetof(struct sctp_sock, initmsg) -
> > offsetof(struct sctp_sock, subscribe) +
> > - sizeof_field(struct sctp_sock, initmsg),
> > + FIELD_SIZEOF(struct sctp_sock, initmsg),
> > .sysctl_mem = sysctl_sctp_mem,
> > .sysctl_rmem = sysctl_sctp_rmem,
> > .sysctl_wmem = sysctl_sctp_wmem,
> > @@ -9419,7 +9419,7 @@ struct proto sctpv6_prot = {
> > .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
> > .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
> > offsetof(struct sctp6_sock, sctp.subscribe) +
> > - sizeof_field(struct sctp6_sock, sctp.initmsg),
> > + FIELD_SIZEOF(struct sctp6_sock, sctp.initmsg),
> > .sysctl_mem = sysctl_sctp_mem,
> > .sysctl_rmem = sysctl_sctp_rmem,
> > .sysctl_wmem = sysctl_sctp_wmem,
> > diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h
> > index a29206ebbd13..571c35aac90f 100644
> > --- a/tools/testing/selftests/bpf/bpf_util.h
> > +++ b/tools/testing/selftests/bpf/bpf_util.h
> > @@ -58,13 +58,29 @@ static inline unsigned int bpf_num_possible_cpus(void)
> > # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
> > #endif
> >
> > -#ifndef sizeof_field
> > -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
> > +/*
> > + * FIELD_SIZEOF - get the size of a struct's field
> > + * @t: the target struct
> > + * @f: the target struct's field
> > + * Return: the size of @f in the struct definition without having a
> > + * declared instance of @t.
> > + */
> > +#ifndef FIELD_SIZEOF
> > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f))
> > #endif
> >
> > +/*
> > + * For code compatibility
> > + *
> > + * sizeof_field(TYPE, MEMBER)
> > + * @TYPE: The structure containing the field of interest
> > + * @MEMBER: The field to return the size of
> > + */
> > +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER)
> > +
> > #ifndef offsetofend
> > #define offsetofend(TYPE, MEMBER) \
> > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
> > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER))
> > #endif
> >
> > #endif /* __BPF_UTIL__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index ca54b09adf5b..e43e3a26f6ab 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -4275,7 +4275,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
> > kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
> > SLAB_ACCOUNT,
> > offsetof(struct kvm_vcpu, arch),
> > - sizeof_field(struct kvm_vcpu, arch),
> > + FIELD_SIZEOF(struct kvm_vcpu, arch),
> > NULL);
> > if (!kvm_vcpu_cache) {
> > r = -ENOMEM;
> > --
> > 2.11.0
> >
>
> --
> Kees Cook
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