[PATCH 00/26] use array_size

[PATCH 00/26] use array_size

[Julia Lawall]

Use array_size to protect against multiplication overflows.

This follows up on the following patches by Kees Cook from 2018.

42bc47b35320 ("treewide: Use array_size() in vmalloc()")
fad953ce0b22 ("treewide: Use array_size() in vzalloc()")

The changes were done using the following Coccinelle semantic patch,
adapted from the one posted by Kees.

// Drop single-byte sizes and redundant parens.
@@
    expression COUNT;
    typedef u8;
    typedef __u8;
    type t = {u8,__u8,char,unsigned char};
    identifier alloc = {vmalloc,vzalloc};
@@
      alloc(
-           (sizeof(t)) * (COUNT)
+           COUNT
      , ...)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
    expression COUNT;
    size_t e1, e2, e3;
    identifier alloc = {vmalloc,vzalloc};
@@

(    
      alloc(
-           (e1) * (e2) * (e3)
+           array3_size(e1, e2, e3)
      ,...)
|
      alloc(
-           (e1) * (e2) * (COUNT)
+           array3_size(COUNT, e1, e2)
      ,...)
)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
    expression STRIDE, COUNT;
    size_t e;
    identifier alloc = {vmalloc,vzalloc};
@@

      alloc(
-           (e) * (COUNT) * (STRIDE)
+           array3_size(COUNT, STRIDE, e)
      ,...)

// Any remaining multi-factor products, first at least 3-factor products
// when they're not all constants...
@@
    expression E1, E2, E3;
    constant C1, C2, C3;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2 * C3,...)
|
      alloc(
-           (E1) * (E2) * (E3)
+           array3_size(E1, E2, E3)
      ,...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
    size_t e1,e2;
    expression COUNT;
    identifier alloc = {vmalloc,vzalloc};
@@

(
      alloc(
-           (e1) * (e2)
+           array_size(e1, e2)
      ,...)
|
      alloc(
-           (e1) * (COUNT)
+           array_size(COUNT, e1)
      ,...)
)
    
// And then all remaining 2 factors products when they're not all constants.
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)


---

 arch/x86/kernel/cpu/sgx/main.c                    |    3 ++-
 drivers/accel/habanalabs/common/device.c          |    3 ++-
 drivers/accel/habanalabs/common/state_dump.c      |    6 +++---
 drivers/bus/mhi/host/init.c                       |    4 ++--
 drivers/comedi/comedi_buf.c                       |    4 ++--
 drivers/dma-buf/heaps/system_heap.c               |    2 +-
 drivers/gpu/drm/gud/gud_pipe.c                    |    2 +-
 drivers/gpu/drm/i915/gvt/gtt.c                    |    6 ++++--
 drivers/gpu/drm/vmwgfx/vmwgfx_devcaps.c           |    2 +-
 drivers/infiniband/hw/bnxt_re/qplib_res.c         |    4 ++--
 drivers/infiniband/hw/erdma/erdma_verbs.c         |    4 ++--
 drivers/infiniband/sw/siw/siw_qp.c                |    4 ++--
 drivers/infiniband/sw/siw/siw_verbs.c             |    6 +++---
 drivers/iommu/tegra-gart.c                        |    4 ++--
 drivers/net/ethernet/amd/pds_core/core.c          |    4 ++--
 drivers/net/ethernet/freescale/enetc/enetc.c      |    4 ++--
 drivers/net/ethernet/google/gve/gve_tx.c          |    2 +-
 drivers/net/ethernet/marvell/octeon_ep/octep_rx.c |    2 +-
 drivers/net/ethernet/microsoft/mana/hw_channel.c  |    2 +-
 drivers/net/ethernet/pensando/ionic/ionic_lif.c   |    4 ++--
 drivers/scsi/fnic/fnic_trace.c                    |    2 +-
 drivers/scsi/qla2xxx/qla_init.c                   |    4 ++--
 drivers/staging/media/ipu3/ipu3-mmu.c             |    2 +-
 drivers/vdpa/vdpa_user/iova_domain.c              |    3 +--
 drivers/virtio/virtio_mem.c                       |    6 +++---
 fs/btrfs/zoned.c                                  |    5 +++--
 kernel/kcov.c                                     |    2 +-
 lib/test_vmalloc.c                                |   12 ++++++------
 28 files changed, 56 insertions(+), 52 deletions(-)

[PATCH 21/26] x86/sgx: use array_size

[Julia Lawall]

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

---
 arch/x86/kernel/cpu/sgx/main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 166692f2d501..3a234942c586 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -628,7 +628,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size,
 	if (!section->virt_addr)
 		return false;
 
-	section->pages = vmalloc(nr_pages * sizeof(struct sgx_epc_page));
+	section->pages = vmalloc(array_size(nr_pages,
+					    sizeof(struct sgx_epc_page)));
 	if (!section->pages) {
 		memunmap(section->virt_addr);
 		return false;

Re: [PATCH 21/26] x86/sgx: use array_size

[Jarkko Sakkinen]

On Fri, 2023-06-23 at 23:14 +0200, Julia Lawall wrote:
> Use array_size to protect against multiplication overflows.
> 
> The changes were done using the following Coccinelle semantic patch:
> 
> // <smpl>
> @@
>     expression E1, E2;
>     constant C1, C2;
>     identifier alloc = {vmalloc,vzalloc};
> @@
>     
> (
>       alloc(C1 * C2,...)
> > 
>       alloc(
> -           (E1) * (E2)
> +           array_size(E1, E2)
>       ,...)
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
> 
> ---
>  arch/x86/kernel/cpu/sgx/main.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> index 166692f2d501..3a234942c586 100644
> --- a/arch/x86/kernel/cpu/sgx/main.c
> +++ b/arch/x86/kernel/cpu/sgx/main.c
> @@ -628,7 +628,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size,
>  	if (!section->virt_addr)
>  		return false;
>  
> -	section->pages = vmalloc(nr_pages * sizeof(struct sgx_epc_page));
> +	section->pages = vmalloc(array_size(nr_pages,
> +					    sizeof(struct sgx_epc_page)));
>  	if (!section->pages) {
>  		memunmap(section->virt_addr);
>  		return false;
> 

Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

BR, Jarkko