From 870410910b6ad032afb6a02bfd6a8c65dde6084b Mon Sep 17 00:00:00 2001 From: Azeem Shaikh Date: Tue, 30 May 2023 16:30:41 +0000 Subject: [PATCH] sh: 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 Acked-by: John Paul Adrian Glaubitz Tested-by: John Paul Adrian Glaubitz Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20230530163041.985456-1-azeemshaikh38@gmail.com --- arch/sh/drivers/dma/dma-api.c | 2 +- arch/sh/kernel/setup.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/sh/drivers/dma/dma-api.c b/arch/sh/drivers/dma/dma-api.c index ab9170494dcc..89cd4a3b4cca 100644 --- a/arch/sh/drivers/dma/dma-api.c +++ b/arch/sh/drivers/dma/dma-api.c @@ -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); diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c index af977ec4ca5e..e4f0f9a1d355 100644 --- a/arch/sh/kernel/setup.c +++ b/arch/sh/kernel/setup.c @@ -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));