kprobes: Fix to check symbol prefixes correctly

Since str_has_prefix() takes the prefix as the 2nd argument and the string
as the first, is_cfi_preamble_symbol() always fails to check the prefix.
Fix the function parameter order so that it correctly check the prefix.

Link: https://lore.kernel.org/all/172260679559.362040.7360872132937227206.stgit@devnote2/
Fixes: de02f2ac5d8c ("kprobes: Prohibit probing on CFI preamble symbol")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index e85de37..da59c68 100644 (file)
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1557,8 +1557,8 @@ static bool is_cfi_preamble_symbol(unsigned long addr)
        if (lookup_symbol_name(addr, symbuf))
                return false;
 
-       return str_has_prefix("__cfi_", symbuf) ||
-               str_has_prefix("__pfx_", symbuf);
+       return str_has_prefix(symbuf, "__cfi_") ||
+               str_has_prefix(symbuf, "__pfx_");
 }
 
 static int check_kprobe_address_safe(struct kprobe *p,