From 838ae9f45c4e43b4633d8b0ad1fbedff9ecf177d Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Sat, 30 Mar 2024 07:12:03 -0700 Subject: nouveau/gsp: Avoid addressing beyond end of rpc->entries Using the end of rpc->entries[] for addressing runs into both compile-time and run-time detection of accessing beyond the end of the array. Use the base pointer instead, since was allocated with the additional bytes for storing the strings. Avoids the following warning in future GCC releases with support for __counted_by: In function 'fortify_memcpy_chk', inlined from 'r535_gsp_rpc_set_registry' at ../drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1123:3: ../include/linux/fortify-string.h:553:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] 553 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ for this code: strings = (char *)&rpc->entries[NV_GSP_REG_NUM_ENTRIES]; ... memcpy(strings, r535_registry_entries[i].name, name_len); Signed-off-by: Kees Cook Signed-off-by: Danilo Krummrich Link: https://patchwork.freedesktop.org/patch/msgid/20240330141159.work.063-kees@kernel.org --- drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev') diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c index 9994cbd6f1c4..9858c1438aa7 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c @@ -1112,7 +1112,7 @@ r535_gsp_rpc_set_registry(struct nvkm_gsp *gsp) rpc->numEntries = NV_GSP_REG_NUM_ENTRIES; str_offset = offsetof(typeof(*rpc), entries[NV_GSP_REG_NUM_ENTRIES]); - strings = (char *)&rpc->entries[NV_GSP_REG_NUM_ENTRIES]; + strings = (char *)rpc + str_offset; for (i = 0; i < NV_GSP_REG_NUM_ENTRIES; i++) { int name_len = strlen(r535_registry_entries[i].name) + 1; -- cgit From 185fdb4697cc9684a02f2fab0530ecdd0c2f15d4 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 4 Apr 2024 18:02:25 +0200 Subject: nouveau: fix function cast warning Calling a function through an incompatible pointer type causes breaks kcfi, so clang warns about the assignment: drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c:73:10: error: cast from 'void (*)(const void *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict] 73 | .fini = (void(*)(void *))kfree, Avoid this with a trivial wrapper. Fixes: c39f472e9f14 ("drm/nouveau: remove symlinks, move core/ to nvkm/ (no code changes)") Signed-off-by: Arnd Bergmann Signed-off-by: Danilo Krummrich Link: https://patchwork.freedesktop.org/patch/msgid/20240404160234.2923554-1-arnd@kernel.org --- drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev') diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c index 4bf486b57101..cb05f7f48a98 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c @@ -66,11 +66,16 @@ of_init(struct nvkm_bios *bios, const char *name) return ERR_PTR(-EINVAL); } +static void of_fini(void *p) +{ + kfree(p); +} + const struct nvbios_source nvbios_of = { .name = "OpenFirmware", .init = of_init, - .fini = (void(*)(void *))kfree, + .fini = of_fini, .read = of_read, .size = of_size, .rw = false, -- cgit