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kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol_descriptor()

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~15 years ago kprobes grew the 'arch_deref_entry_point()' __weak function:

  3d7e33825d: ("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>
This commit is contained in:
Masami Hiramatsu
2021-09-14 23:40:36 +09:00
committed by Steven Rostedt (VMware)
parent a7fe237845
commit f2ec8d9a3b
5 changed files with 3 additions and 24 deletions
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3
lib/error-inject.c
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@@ -8,6 +8,7 @@
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <asm/sections.h>
/* Whitelist of symbols that can be overridden for error injection. */
static LIST_HEAD(error_injection_list);
@@ -64,7 +65,7 @@ static void populate_error_injection_list(struct error_injection_entry *start,
mutex_lock(&ei_mutex);
for (iter = start; iter < end; iter++) {
entry = arch_deref_entry_point((void *)iter->addr);
entry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);
if (!kernel_text_address(entry) ||
!kallsyms_lookup_size_offset(entry, &size, &offset)) {