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staging: most: Replace all non-returning strlcpy with strscpy 

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230523021640.2406585-1-azeemshaikh38@gmail.com
This commit is contained in:
Azeem Shaikh 2023-05-23 02:16:40 +00:00 committed by Kees Cook
parent f4a0659f82
commit 2af4aa3be5
1 changed files with 4 additions and 4 deletions
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8
drivers/most/configfs.c
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@ -204,7 +204,7 @@ static ssize_t mdev_link_device_store(struct config_item *item,
{
struct mdev_link *mdev_link = to_mdev_link(item);
strlcpy(mdev_link->device, page, sizeof(mdev_link->device));
strscpy(mdev_link->device, page, sizeof(mdev_link->device));
strim(mdev_link->device);
return count;
}
@ -219,7 +219,7 @@ static ssize_t mdev_link_channel_store(struct config_item *item,
{
struct mdev_link *mdev_link = to_mdev_link(item);
strlcpy(mdev_link->channel, page, sizeof(mdev_link->channel));
strscpy(mdev_link->channel, page, sizeof(mdev_link->channel));
strim(mdev_link->channel);
return count;
}
@ -234,7 +234,7 @@ static ssize_t mdev_link_comp_store(struct config_item *item,
{
struct mdev_link *mdev_link = to_mdev_link(item);
strlcpy(mdev_link->comp, page, sizeof(mdev_link->comp));
strscpy(mdev_link->comp, page, sizeof(mdev_link->comp));
strim(mdev_link->comp);
return count;
}
@ -250,7 +250,7 @@ static ssize_t mdev_link_comp_params_store(struct config_item *item,
{
struct mdev_link *mdev_link = to_mdev_link(item);
strlcpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params));
strscpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params));
strim(mdev_link->comp_params);
return count;
}