From 6a22e017f952ecaf4bb510cd0939259470a27b06 Mon Sep 17 00:00:00 2001 From: Azeem Shaikh Date: Tue, 30 May 2023 16:23:58 +0000 Subject: [PATCH] nios2: 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 Reviewed-by: Kees Cook Signed-off-by: Azeem Shaikh Signed-off-by: Dinh Nguyen --- arch/nios2/kernel/cpuinfo.c | 2 +- arch/nios2/kernel/setup.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/nios2/kernel/cpuinfo.c b/arch/nios2/kernel/cpuinfo.c index 203870c4b86d9..338849c430a52 100644 --- a/arch/nios2/kernel/cpuinfo.c +++ b/arch/nios2/kernel/cpuinfo.c @@ -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, ""); diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c index 40bc8fb75e0b5..8582ed9658447 100644 --- a/arch/nios2/kernel/setup.c +++ b/arch/nios2/kernel/setup.c @@ -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 -- 2.30.2