5.15-stable review patch. If anyone has any objections, please let me know.
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From: Masami Hiramatsu (Google) mhiramat@kernel.org
[ Upstream commit 8c8acb8f26cbde665b233dd1b9bbcbb9b86822dc ]
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@de...
Fixes: de02f2ac5d8c ("kprobes: Prohibit probing on CFI preamble symbol") Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/kprobes.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 258d425b2c4a5..0d463859ad329 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1545,8 +1545,8 @@ 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,