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sh: Replace all non-returning strlcpy with strscpy

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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>
Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230530163041.985456-1-azeemshaikh38@gmail.com
This commit is contained in:
Azeem Shaikh 2023-05-30 16:30:41 +00:00 • committed by Kees Cook
parent fdd932efae
commit 870410910b
2 changed files with 3 additions and 3 deletions
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2
arch/sh/drivers/dma/dma-api.c
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@ -198,7 +198,7 @@ int request_dma(unsigned int chan, const char *dev_id)
if (atomic_xchg(&channel->busy, 1))
return -EBUSY;
strlcpy(channel->dev_id, dev_id, sizeof(channel->dev_id));
strscpy(channel->dev_id, dev_id, sizeof(channel->dev_id));
if (info->ops->request) {
result = info->ops->request(channel);

4
arch/sh/kernel/setup.c
View file

@ -304,9 +304,9 @@ void __init setup_arch(char **cmdline_p)
bss_resource.end = virt_to_phys(__bss_stop)-1;
#ifdef CONFIG_CMDLINE_OVERWRITE
strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
#else
strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
strscpy(command_line, COMMAND_LINE, sizeof(command_line));
#ifdef CONFIG_CMDLINE_EXTEND
strlcat(command_line, " ", sizeof(command_line));
strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));