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kallsyms: 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>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230614010354.1026096-1-azeemshaikh38@gmail.com
This commit is contained in:
Azeem Shaikh 2023-06-14 01:03:54 +00:00 committed by Kees Cook
parent 870410910b
commit 33457938a0
2 changed files with 3 additions and 3 deletions
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4
kernel/kallsyms.c
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@ -716,7 +716,7 @@ static int get_ksymbol_bpf(struct kallsym_iter *iter)
{
int ret;
strlcpy(iter->module_name, "bpf", MODULE_NAME_LEN);
strscpy(iter->module_name, "bpf", MODULE_NAME_LEN);
iter->exported = 0;
ret = bpf_get_kallsym(iter->pos - iter->pos_ftrace_mod_end,
&iter->value, &iter->type,
@ -736,7 +736,7 @@ static int get_ksymbol_bpf(struct kallsym_iter *iter)
*/
static int get_ksymbol_kprobe(struct kallsym_iter *iter)
{
strlcpy(iter->module_name, "__builtin__kprobes", MODULE_NAME_LEN);
strscpy(iter->module_name, "__builtin__kprobes", MODULE_NAME_LEN);
iter->exported = 0;
return kprobe_get_kallsym(iter->pos - iter->pos_bpf_end,
&iter->value, &iter->type,

2
kernel/params.c
View File

@ -847,7 +847,7 @@ static void __init param_sysfs_builtin(void)
name_len = 0;
} else {
name_len = dot - kp->name + 1;
strlcpy(modname, kp->name, name_len);
strscpy(modname, kp->name, name_len);
}
kernel_add_sysfs_param(modname, kp, name_len);
}