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Message-ID: <20230914-strncpy-drivers-gpu-drm-nouveau-nvif-client-c-v1-1-dc3b3719fcb4@google.com>
Date: Thu, 14 Sep 2023 21:30:37 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Ben Skeggs <bskeggs@...hat.com>, Karol Herbst <kherbst@...hat.com>,
Lyude Paul <lyude@...hat.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] drm/nouveau/nvif: refactor deprecated strncpy
`strncpy` is deprecated and as such we should prefer more robust and
less ambiguous string interfaces.
A suitable replacement is `strscpy_pad` due to the fact that it
guarantees NUL-termination on the destination buffer whilst also
maintaining the NUL-padding behavior that `strncpy` provides. I am not
sure whether NUL-padding is strictly needed but I see in
`nvif_object_ctor()` args is memcpy'd elsewhere so I figured we'd keep
the same functionality.
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Note: build-tested only.
---
drivers/gpu/drm/nouveau/nvif/client.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nvif/client.c b/drivers/gpu/drm/nouveau/nvif/client.c
index a3264a0e933a..3a27245f467f 100644
--- a/drivers/gpu/drm/nouveau/nvif/client.c
+++ b/drivers/gpu/drm/nouveau/nvif/client.c
@@ -69,7 +69,7 @@ nvif_client_ctor(struct nvif_client *parent, const char *name, u64 device,
} nop = {};
int ret;
- strncpy(args.name, name, sizeof(args.name));
+ strscpy_pad(args.name, name, sizeof(args.name));
ret = nvif_object_ctor(parent != client ? &parent->object : NULL,
name ? name : "nvifClient", 0,
NVIF_CLASS_CLIENT, &args, sizeof(args),
---
base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec
change-id: 20230914-strncpy-drivers-gpu-drm-nouveau-nvif-client-c-82b023c36953
Best regards,
--
Justin Stitt <justinstitt@...gle.com>
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