Gustavo A. R. Silva
2023-Nov-16 18:11 UTC
[Nouveau] [PATCH][next] nouveau/gsp: replace zero-length array with flex-array member and use __counted_by
Fake flexible arrays (zero-length and one-element arrays) are deprecated,
and should be replaced by flexible-array members. So, replace
zero-length array with a flexible-array member in `struct
PACKED_REGISTRY_TABLE`.
Also annotate array `entries` with `__counted_by()` to prepare for the
coming implementation by GCC and Clang of the `__counted_by` attribute.
Flexible array members annotated with `__counted_by` can have their
accesses bounds-checked at run-time via `CONFIG_UBSAN_BOUNDS` (for array
indexing) and `CONFIG_FORTIFY_SOURCE` (for strcpy/memcpy-family functions).
This fixes multiple -Warray-bounds warnings:
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1069:29: warning: array subscript
0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]'
[-Warray-bounds=]
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1070:29: warning: array subscript
0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]'
[-Warray-bounds=]
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1071:29: warning: array subscript
0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]'
[-Warray-bounds=]
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1072:29: warning: array subscript
0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]'
[-Warray-bounds=]
While there, also make use of the struct_size() helper, and address
checkpatch.pl warning:
WARNING: please, no spaces at the start of a line
This results in no differences in binary output.
Signed-off-by: Gustavo A. R. Silva <gustavoars at kernel.org>
---
.../nvrm/535.113.01/nvidia/generated/g_os_nvoc.h | 14 +++++++-------
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c | 2 +-
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git
a/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h
b/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h
index 754c6af42f30..259b25c2ac6b 100644
---
a/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h
+++
b/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h
@@ -28,17 +28,17 @@
typedef struct PACKED_REGISTRY_ENTRY
{
- NvU32 nameOffset;
- NvU8 type;
- NvU32 data;
- NvU32 length;
+ NvU32 nameOffset;
+ NvU8 type;
+ NvU32 data;
+ NvU32 length;
} PACKED_REGISTRY_ENTRY;
typedef struct PACKED_REGISTRY_TABLE
{
- NvU32 size;
- NvU32 numEntries;
- PACKED_REGISTRY_ENTRY entries[0];
+ NvU32 size;
+ NvU32 numEntries;
+ PACKED_REGISTRY_ENTRY entries[] __counted_by(numEntries);
} PACKED_REGISTRY_TABLE;
#endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
index dc44f5c7833f..228335487af5 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
@@ -1048,7 +1048,7 @@ r535_gsp_rpc_set_registry(struct nvkm_gsp *gsp)
char *strings;
int str_offset;
int i;
- size_t rpc_size = sizeof(*rpc) + sizeof(rpc->entries[0]) *
NV_GSP_REG_NUM_ENTRIES;
+ size_t rpc_size = struct_size(rpc, entries, NV_GSP_REG_NUM_ENTRIES);
/* add strings + null terminator */
for (i = 0; i < NV_GSP_REG_NUM_ENTRIES; i++)
--
2.34.1
Kees Cook
2023-Nov-16 18:28 UTC
[Nouveau] [PATCH][next] nouveau/gsp: replace zero-length array with flex-array member and use __counted_by
On Thu, Nov 16, 2023 at 12:11:43PM -0600, Gustavo A. R. Silva wrote:> Fake flexible arrays (zero-length and one-element arrays) are deprecated, > and should be replaced by flexible-array members. So, replace > zero-length array with a flexible-array member in `struct > PACKED_REGISTRY_TABLE`. > > Also annotate array `entries` with `__counted_by()` to prepare for the > coming implementation by GCC and Clang of the `__counted_by` attribute. > Flexible array members annotated with `__counted_by` can have their > accesses bounds-checked at run-time via `CONFIG_UBSAN_BOUNDS` (for array > indexing) and `CONFIG_FORTIFY_SOURCE` (for strcpy/memcpy-family functions). > > This fixes multiple -Warray-bounds warnings: > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1069:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1070:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1071:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1072:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > > While there, also make use of the struct_size() helper, and address > checkpatch.pl warning: > WARNING: please, no spaces at the start of a line > > This results in no differences in binary output. > > Signed-off-by: Gustavo A. R. Silva <gustavoars at kernel.org>Looks nice to me. Reviewed-by: Kees Cook <keescook at chromium.org> -- Kees Cook
Timur Tabi
2023-Nov-16 19:08 UTC
[Nouveau] [PATCH][next] nouveau/gsp: replace zero-length array with flex-array member and use __counted_by
On Thu, 2023-11-16 at 12:11 -0600, Gustavo A. R. Silva wrote:
typedef struct PACKED_REGISTRY_TABLE
{
- NvU32 size;
- NvU32 numEntries;
- PACKED_REGISTRY_ENTRY entries[0];
+ NvU32 size;
+ NvU32 numEntries;
+ PACKED_REGISTRY_ENTRY entries[] __counted_by(numEntries);
} PACKED_REGISTRY_TABLE;
Well, it's better than mine:
https://lore.kernel.org/all/20231107234726.854248-1-ttabi at nvidia.com/T/
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Danilo Krummrich
2023-Nov-16 19:45 UTC
[Nouveau] [PATCH][next] nouveau/gsp: replace zero-length array with flex-array member and use __counted_by
Hi Gustavo, On Thu, Nov 16, 2023 at 12:11:43PM -0600, Gustavo A. R. Silva wrote:> Fake flexible arrays (zero-length and one-element arrays) are deprecated, > and should be replaced by flexible-array members. So, replace > zero-length array with a flexible-array member in `struct > PACKED_REGISTRY_TABLE`. > > Also annotate array `entries` with `__counted_by()` to prepare for the > coming implementation by GCC and Clang of the `__counted_by` attribute. > Flexible array members annotated with `__counted_by` can have their > accesses bounds-checked at run-time via `CONFIG_UBSAN_BOUNDS` (for array > indexing) and `CONFIG_FORTIFY_SOURCE` (for strcpy/memcpy-family functions). > > This fixes multiple -Warray-bounds warnings: > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1069:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1070:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1071:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1072:29: warning: array subscript 0 is outside array bounds of 'PACKED_REGISTRY_ENTRY[0]' [-Warray-bounds=] > > While there, also make use of the struct_size() helper, and address > checkpatch.pl warning: > WARNING: please, no spaces at the start of a line > > This results in no differences in binary output. > > Signed-off-by: Gustavo A. R. Silva <gustavoars at kernel.org> > --- > .../nvrm/535.113.01/nvidia/generated/g_os_nvoc.h | 14 +++++++------- > drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c | 2 +- > 2 files changed, 8 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h b/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h > index 754c6af42f30..259b25c2ac6b 100644 > --- a/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h > +++ b/drivers/gpu/drm/nouveau/include/nvrm/535.113.01/nvidia/generated/g_os_nvoc.h > @@ -28,17 +28,17 @@ > > typedef struct PACKED_REGISTRY_ENTRY > { > - NvU32 nameOffset; > - NvU8 type; > - NvU32 data; > - NvU32 length; > + NvU32 nameOffset; > + NvU8 type; > + NvU32 data; > + NvU32 length; > } PACKED_REGISTRY_ENTRY; > > typedef struct PACKED_REGISTRY_TABLE > { > - NvU32 size; > - NvU32 numEntries; > - PACKED_REGISTRY_ENTRY entries[0]; > + NvU32 size; > + NvU32 numEntries; > + PACKED_REGISTRY_ENTRY entries[] __counted_by(numEntries); > } PACKED_REGISTRY_TABLE;Thanks for the fix! However, I have some concerns about changing those header files, since they're just copied over from Nvidia's driver [1]. Once we add the header files for a new firmware revision, we'd potentially run into the same issue, applying the same fix again. As I already mentioned for Timur's patch [2], I'd prefer to get a fix upstream (meaning [1] in this case). Of course, that's probably more up to Timur to tell if this will work out. If we can't get a fix upstream, I'd probably prefer to silence warning elsewhere. [1] https://github.com/NVIDIA/open-gpu-kernel-modules [2] https://lore.kernel.org/all/20231107234726.854248-1-ttabi at nvidia.com/T/> > #endif > diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c > index dc44f5c7833f..228335487af5 100644 > --- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c > +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c > @@ -1048,7 +1048,7 @@ r535_gsp_rpc_set_registry(struct nvkm_gsp *gsp) > char *strings; > int str_offset; > int i; > - size_t rpc_size = sizeof(*rpc) + sizeof(rpc->entries[0]) * NV_GSP_REG_NUM_ENTRIES; > + size_t rpc_size = struct_size(rpc, entries, NV_GSP_REG_NUM_ENTRIES); > > /* add strings + null terminator */ > for (i = 0; i < NV_GSP_REG_NUM_ENTRIES; i++) > -- > 2.34.1 >
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