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drm/nouveau/secboot/acr: Remove VLA usage 

In the quest to remove all stack VLA usage from the kernel[1], this
allocates the working buffers before starting the writing so it won't
abort in the middle. This needs an initial walk of the lists to figure
out how large the buffer should be.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Kees Cook 2018-05-24 10:24:36 -07:00 committed by Ben Skeggs
parent 94a0b8634f
commit 0d46690155
2 changed files with 37 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/gpu/drm/nouveau/nvkm/subdev/secboot/acr_r352.c
View File

@ -414,6 +414,20 @@ acr_r352_ls_write_wpr(struct acr_r352 *acr, struct list_head *imgs,
{
struct ls_ucode_img *_img;
u32 pos = 0;
u32 max_desc_size = 0;
u8 *gdesc;
/* Figure out how large we need gdesc to be. */
list_for_each_entry(_img, imgs, node) {
const struct acr_r352_ls_func *ls_func =
acr->func->ls_func[_img->falcon_id];
max_desc_size = max(max_desc_size, ls_func->bl_desc_size);
}
gdesc = kmalloc(max_desc_size, GFP_KERNEL);
if (!gdesc)
return -ENOMEM;
nvkm_kmap(wpr_blob);
@ -421,7 +435,6 @@ acr_r352_ls_write_wpr(struct acr_r352 *acr, struct list_head *imgs,
struct ls_ucode_img_r352 *img = ls_ucode_img_r352(_img);
const struct acr_r352_ls_func *ls_func =
acr->func->ls_func[_img->falcon_id];
u8 gdesc[ls_func->bl_desc_size];
nvkm_gpuobj_memcpy_to(wpr_blob, pos, &img->wpr_header,
sizeof(img->wpr_header));
@ -447,6 +460,8 @@ acr_r352_ls_write_wpr(struct acr_r352 *acr, struct list_head *imgs,
nvkm_done(wpr_blob);
kfree(gdesc);
return 0;
}
@ -771,7 +786,11 @@ acr_r352_load(struct nvkm_acr *_acr, struct nvkm_falcon *falcon,
struct fw_bl_desc *hsbl_desc;
void *bl, *blob_data, *hsbl_code, *hsbl_data;
u32 code_size;
u8 bl_desc[bl_desc_size];
u8 *bl_desc;
bl_desc = kzalloc(bl_desc_size, GFP_KERNEL);
if (!bl_desc)
return -ENOMEM;
/* Find the bootloader descriptor for our blob and copy it */
if (blob == acr->load_blob) {
@ -802,7 +821,6 @@ acr_r352_load(struct nvkm_acr *_acr, struct nvkm_falcon *falcon,
code_size, hsbl_desc->start_tag, 0, false);
/* Generate the BL header */
memset(bl_desc, 0, bl_desc_size);
acr->func->generate_hs_bl_desc(load_hdr, bl_desc, offset);
/*
@ -811,6 +829,7 @@ acr_r352_load(struct nvkm_acr *_acr, struct nvkm_falcon *falcon,
nvkm_falcon_load_dmem(falcon, bl_desc, hsbl_desc->dmem_load_off,
bl_desc_size, 0);
kfree(bl_desc);
return hsbl_desc->start_tag << 8;
}

16
drivers/gpu/drm/nouveau/nvkm/subdev/secboot/acr_r367.c
View File

@ -265,6 +265,19 @@ acr_r367_ls_write_wpr(struct acr_r352 *acr, struct list_head *imgs,
{
struct ls_ucode_img *_img;
u32 pos = 0;
u32 max_desc_size = 0;
u8 *gdesc;
list_for_each_entry(_img, imgs, node) {
const struct acr_r352_ls_func *ls_func =
acr->func->ls_func[_img->falcon_id];
max_desc_size = max(max_desc_size, ls_func->bl_desc_size);
}
gdesc = kmalloc(max_desc_size, GFP_KERNEL);
if (!gdesc)
return -ENOMEM;
nvkm_kmap(wpr_blob);
@ -272,7 +285,6 @@ acr_r367_ls_write_wpr(struct acr_r352 *acr, struct list_head *imgs,
struct ls_ucode_img_r367 *img = ls_ucode_img_r367(_img);
const struct acr_r352_ls_func *ls_func =
acr->func->ls_func[_img->falcon_id];
u8 gdesc[ls_func->bl_desc_size];
nvkm_gpuobj_memcpy_to(wpr_blob, pos, &img->wpr_header,
sizeof(img->wpr_header));
@ -298,6 +310,8 @@ acr_r367_ls_write_wpr(struct acr_r352 *acr, struct list_head *imgs,
nvkm_done(wpr_blob);
kfree(gdesc);
return 0;
}