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nios2: 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

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
This commit is contained in:
Azeem Shaikh 2023-05-30 16:23:58 +00:00 committed by Dinh Nguyen
parent 6ebe94baa2
commit 6a22e017f9
2 changed files with 4 additions and 4 deletions
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2
arch/nios2/kernel/cpuinfo.c
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@ -47,7 +47,7 @@ void __init setup_cpuinfo(void)
str = of_get_property(cpu, "altr,implementation", &len);
if (str)
strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl));
strscpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl));
else
strcpy(cpuinfo.cpu_impl, "<unknown>");

6
arch/nios2/kernel/setup.c
View File

@ -121,7 +121,7 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
dtb_passed = r6;
if (r7)
strlcpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE);
strscpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE);
}
#endif
@ -129,10 +129,10 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
#ifndef CONFIG_CMDLINE_FORCE
if (cmdline_passed[0])
strlcpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE);
strscpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE);
#ifdef CONFIG_NIOS2_CMDLINE_IGNORE_DTB
else
strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#endif
#endif