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Index: emacs-29.4/src/lread.c
===================================================================
--- emacs-29.4.orig/src/lread.c
+++ emacs-29.4/src/lread.c
@@ -1668,9 +1668,34 @@ directories, make sure the PREDICATE fun
#ifdef HAVE_NATIVE_COMP
static bool
+permit_swap_for_eln (Lisp_Object src_name, Lisp_Object eln_name)
+{
+ char *src = SSDATA (src_name), *eln = SSDATA (eln_name);
+ size_t eln_ln = strlen (eln);
+
+ while (*src && *eln && *src == *eln)
+ {
+ ++src; ++eln; --eln_ln;
+ }
+
+ /* After stripping common prefixes, the first directory should be
+ * "lib/" (inside the Guix store) or "native-lisp" (inside Emacs build).
+ * Alternatively, if eln contains "eln-cache", it's likely the user's
+ * cache, which we will also permit. */
+
+ return
+ (eln_ln > 4 && !strncmp (eln, "lib/", 4)) ||
+ (eln_ln > 12 && !strncmp (eln, "native-lisp/", 12)) ||
+ strstr (eln, "eln-cache") != NULL;
+}
+
+static bool
maybe_swap_for_eln1 (Lisp_Object src_name, Lisp_Object eln_name,
Lisp_Object *filename, int *fd, struct timespec mtime)
{
+ if (!permit_swap_for_eln (src_name, eln_name))
+ return false;
+
struct stat eln_st;
int eln_fd = emacs_open (SSDATA (ENCODE_FILE (eln_name)), O_RDONLY, 0);
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