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authorMasami Hiramatsu <mhiramat@kernel.org>2021-09-14 23:40:36 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-09-30 21:24:06 -0400
commitf2ec8d9a3b8c0f22cd6a2b4f5a2d9aee5206e3b7 (patch)
tree062bc0312dc8c349e621742940d6a4345b747aa2 /kernel/kprobes.c
parenta7fe2378454cf46cd5e2776d05e72bbe8f0a468c (diff)
kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol_descriptor()
~15 years ago kprobes grew the 'arch_deref_entry_point()' __weak function: 3d7e33825d87: ("jprobes: make jprobes a little safer for users") But this is just open-coded dereference_symbol_descriptor() in essence, and its obscure nature was causing bugs. Just use the real thing and remove arch_deref_entry_point(). Link: https://lkml.kernel.org/r/163163043630.489837.7924988885652708696.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Tested-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 8021bccb7770..550042d9a6ef 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1861,11 +1861,6 @@ static struct notifier_block kprobe_exceptions_nb = {
.priority = 0x7fffffff /* we need to be notified first */
};
-unsigned long __weak arch_deref_entry_point(void *entry)
-{
- return (unsigned long)entry;
-}
-
#ifdef CONFIG_KRETPROBES
unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs,
@@ -2327,7 +2322,7 @@ static int __init populate_kprobe_blacklist(unsigned long *start,
int ret;
for (iter = start; iter < end; iter++) {
- entry = arch_deref_entry_point((void *)*iter);
+ entry = (unsigned long)dereference_symbol_descriptor((void *)*iter);
ret = kprobe_add_ksym_blacklist(entry);
if (ret == -EINVAL)
continue;