diff --git a/NEWS b/NEWS
index ab093142..c97e6898 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,13 @@
 # @markup markdown
 
+2.2.14 (2024-08-XX)
+===================
+
+Fixed issues
+------------
+
+- Fix SIGSEGV when nokogiri is loaded before oci8 (GH-263 - Linux only)
+
 2.2.13 (2024-07-27)
 ===================
 
diff --git a/ext/oci8/oci8lib.c b/ext/oci8/oci8lib.c
index 406738ee..14dde9a0 100644
--- a/ext/oci8/oci8lib.c
+++ b/ext/oci8/oci8lib.c
@@ -9,6 +9,7 @@
 #endif
 #if defined(HAVE_PLTHOOK) && !defined(WIN32)
 #include <dlfcn.h>
+#include <sys/mman.h>
 #include "plthook.h"
 #endif
 
@@ -135,6 +136,8 @@ static void rebind_internal_symbols(void)
     void **addr;
     const char *prefix;
     size_t prefix_len;
+    int prot;
+    size_t page_size = sysconf(_SC_PAGESIZE);
 
 #ifdef RTLD_FIRST
     flags |= RTLD_FIRST; /* for macOS */
@@ -161,7 +164,7 @@ static void rebind_internal_symbols(void)
         plthook_close(ph);
         return;
     }
-    while (plthook_enum(ph, &pos, &name, &addr) == 0) {
+    while (plthook_enum_with_prot(ph, &pos, &name, &addr, &prot) == 0) {
         void *funcaddr;
         if (prefix_len != 0) {
             if (strncmp(name, prefix, prefix_len) != 0) {
@@ -179,7 +182,17 @@ static void rebind_internal_symbols(void)
              * PLT entries are forcedly modified to point to itself not
              * to use functions in other libraries.
              */
+#define ALIGN_ADDR(addr) ((void*)((size_t)(addr) & ~(page_size - 1)))
+            if ((prot & PROT_WRITE) == 0) {
+                /* when the region containing addr isn't writable, make it writable temporarily */
+                if (mprotect(ALIGN_ADDR(addr), page_size, PROT_READ | PROT_WRITE) != 0) {
+                    continue;
+                }
+            }
             *addr = funcaddr;
+            if ((prot & PROT_WRITE) == 0) {
+                mprotect(ALIGN_ADDR(addr), page_size, prot);
+            }
         }
     }
     plthook_close(ph);
diff --git a/ext/oci8/plthook.h b/ext/oci8/plthook.h
index 2ef827ed..94d09796 100644
--- a/ext/oci8/plthook.h
+++ b/ext/oci8/plthook.h
@@ -59,8 +59,14 @@ int plthook_replace(plthook_t *plthook, const char *funcname, void *funcaddr, vo
 void plthook_close(plthook_t *plthook);
 const char *plthook_error(void);
 
+/* enumerate entries with memory protection information (bitwise-OR of PROT_READ, PROT_WRITE and PROT_EXEC)
+ *
+ * source: plthook_elf.c and plthook_osx.c
+ */
+int plthook_enum_with_prot(plthook_t *plthook, unsigned int *pos, const char **name_out, void ***addr_out, int *prot);
+
 #ifdef __cplusplus
-}; /* extern "C" */
+} /* extern "C" */
 #endif
 
 #endif
diff --git a/ext/oci8/plthook_elf.c b/ext/oci8/plthook_elf.c
index 28eaf59a..0be2d8b2 100644
--- a/ext/oci8/plthook_elf.c
+++ b/ext/oci8/plthook_elf.c
@@ -187,6 +187,14 @@
 #endif
 #endif /* __LP64__ */
 
+typedef struct mem_prot {
+    size_t start;
+    size_t end;
+    int prot;
+} mem_prot_t;
+
+#define NUM_MEM_PROT 20
+
 struct plthook {
     const Elf_Sym *dynsym;
     const char *dynstr;
@@ -198,6 +206,7 @@ struct plthook {
     const Elf_Plt_Rel *rela_dyn;
     size_t rela_dyn_cnt;
 #endif
+    mem_prot_t mem_prot[NUM_MEM_PROT];
 };
 
 static char errmsg[512];
@@ -207,7 +216,15 @@ static size_t page_size;
 static int plthook_open_executable(plthook_t **plthook_out);
 static int plthook_open_shared_library(plthook_t **plthook_out, const char *filename);
 static const Elf_Dyn *find_dyn_by_tag(const Elf_Dyn *dyn, Elf_Sxword tag);
+
+typedef struct mem_prot_iter mem_prot_iter_t;
+static int mem_prot_begin(mem_prot_iter_t *iter);
+static int mem_prot_next(mem_prot_iter_t *iter, mem_prot_t *mem_prot);
+static void mem_prot_end(mem_prot_iter_t *iter);
+
 static int plthook_open_real(plthook_t **plthook_out, struct link_map *lmap);
+static int plthook_set_mem_prot(plthook_t *plthook);
+static int plthook_get_mem_prot(plthook_t *plthook, void *addr);
 #if defined __FreeBSD__ || defined __sun
 static int check_elf_header(const Elf_Ehdr *ehdr);
 #endif
@@ -397,22 +414,29 @@ static const Elf_Dyn *find_dyn_by_tag(const Elf_Dyn *dyn, Elf_Sxword tag)
 }
 
 #ifdef __linux__
-static int get_memory_permission(void *address)
-{
-    unsigned long addr = (unsigned long)address;
+struct mem_prot_iter {
     FILE *fp;
-    char buf[PATH_MAX];
-    char perms[5];
-    int bol = 1;
+};
 
-    fp = fopen("/proc/self/maps", "r");
-    if (fp == NULL) {
+static int mem_prot_begin(mem_prot_iter_t *iter)
+{
+    iter->fp = fopen("/proc/self/maps", "r");
+    if (iter->fp == NULL) {
         set_errmsg("failed to open /proc/self/maps");
-        return 0;
+        return -1;
     }
-    while (fgets(buf, PATH_MAX, fp) != NULL) {
+    return 0;
+}
+
+static int mem_prot_next(mem_prot_iter_t *iter, mem_prot_t *mem_prot)
+{
+    char buf[PATH_MAX];
+    char perms[5];
+    int bol = 1; /* beginnng of line */
+
+    while (fgets(buf, PATH_MAX, iter->fp) != NULL) {
         unsigned long start, end;
-        int eol = (strchr(buf, '\n') != NULL);
+        int eol = (strchr(buf, '\n') != NULL); /* end of line */
         if (bol) {
             /* The fgets reads from the beginning of a line. */
             if (!eol) {
@@ -431,121 +455,126 @@ static int get_memory_permission(void *address)
         if (sscanf(buf, "%lx-%lx %4s", &start, &end, perms) != 3) {
             continue;
         }
-        if (start <= addr && addr < end) {
-            int prot = 0;
-            if (perms[0] == 'r') {
-                prot |= PROT_READ;
-            } else if (perms[0] != '-') {
-                goto unknown_perms;
-            }
-            if (perms[1] == 'w') {
-                prot |= PROT_WRITE;
-            } else if (perms[1] != '-') {
-                goto unknown_perms;
-            }
-            if (perms[2] == 'x') {
-                prot |= PROT_EXEC;
-            } else if (perms[2] != '-') {
-                goto unknown_perms;
-            }
-            if (perms[3] != 'p') {
-                goto unknown_perms;
-            }
-            if (perms[4] != '\0') {
-                perms[4] = '\0';
-                goto unknown_perms;
-            }
-            fclose(fp);
-            return prot;
+        mem_prot->start = start;
+        mem_prot->end = end;
+        mem_prot->prot = 0;
+        if (perms[0] == 'r') {
+            mem_prot->prot |= PROT_READ;
+        }
+        if (perms[1] == 'w') {
+            mem_prot->prot |= PROT_WRITE;
         }
+        if (perms[2] == 'x') {
+            mem_prot->prot |= PROT_EXEC;
+        }
+        return 0;
     }
-    fclose(fp);
-    set_errmsg("Could not find memory region containing %p", (void*)addr);
-    return 0;
-unknown_perms:
-    fclose(fp);
-    set_errmsg("Unexcepted memory permission %s at %p", perms, (void*)addr);
-    return 0;
+    return -1;
 }
-#elif defined __FreeBSD__
-static int get_memory_permission(void *address)
+
+static void mem_prot_end(mem_prot_iter_t *iter)
 {
-    uint64_t addr = (uint64_t)address;
-    struct kinfo_vmentry *top;
-    int i, cnt;
+    if (iter->fp != NULL) {
+        fclose(iter->fp);
+    }
+}
+#elif defined __FreeBSD__
+struct mem_prot_iter {
+    struct kinfo_vmentry *kve;
+    int idx;
+    int num;
+};
 
-    top = kinfo_getvmmap(getpid(), &cnt);
-    if (top == NULL) {
+static int mem_prot_begin(mem_prot_iter_t *iter)
+{
+    iter->kve = kinfo_getvmmap(getpid(), &iter->num);
+    if (iter->kve == NULL) {
          set_errmsg("failed to call kinfo_getvmmap()\n");
-         return 0;
+         return -1;
     }
-    for (i = 0; i < cnt; i++) {
-        struct kinfo_vmentry *kve = top + i;
+    iter->idx = 0;
+    return 0;
+}
 
-        if (kve->kve_start <= addr && addr < kve->kve_end) {
-            int prot = 0;
-            if (kve->kve_protection & KVME_PROT_READ) {
-                prot |= PROT_READ;
-            }
-            if (kve->kve_protection & KVME_PROT_WRITE) {
-                prot |= PROT_WRITE;
-            }
-            if (kve->kve_protection & KVME_PROT_EXEC) {
-                prot |= PROT_EXEC;
-            }
-            if (prot == 0) {
-                set_errmsg("Unknown kve_protection 0x%x at %p", kve->kve_protection, (void*)addr);
-            }
-            free(top);
-            return prot;
-        }
+static int mem_prot_next(mem_prot_iter_t *iter, mem_prot_t *mem_prot)
+{
+    if (iter->idx >= iter->num) {
+        return -1;
+    }
+    struct kinfo_vmentry *kve = &iter->kve[iter->idx++];
+    mem_prot->start = kve->kve_start;
+    mem_prot->end = kve->kve_end;
+    mem_prot->prot = 0;
+    if (kve->kve_protection & KVME_PROT_READ) {
+        mem_prot->prot |= PROT_READ;
+    }
+    if (kve->kve_protection & KVME_PROT_WRITE) {
+        mem_prot->prot |= PROT_WRITE;
+    }
+    if (kve->kve_protection & KVME_PROT_EXEC) {
+        mem_prot->prot |= PROT_EXEC;
     }
-    free(top);
-    set_errmsg("Could not find memory region containing %p", (void*)addr);
     return 0;
 }
-#elif defined(__sun)
-#define NUM_MAPS 20
-static int get_memory_permission(void *address)
+
+static void mem_prot_end(mem_prot_iter_t *iter)
 {
-    unsigned long addr = (unsigned long)address;
+    if (iter->kve != NULL) {
+        free(iter->kve);
+    }
+}
+#elif defined(__sun)
+struct mem_prot_iter {
     FILE *fp;
-    prmap_t maps[NUM_MAPS];
+    prmap_t maps[20];
+    size_t idx;
     size_t num;
+};
 
-    fp = fopen("/proc/self/map", "r");
-    if (fp == NULL) {
+static int mem_prot_begin(mem_prot_iter_t *iter)
+{
+    iter->fp = fopen("/proc/self/map", "r");
+    if (iter->fp == NULL) {
         set_errmsg("failed to open /proc/self/map");
-        return 0;
+        return -1;
     }
-    while ((num = fread(maps, sizeof(prmap_t), NUM_MAPS, fp)) > 0) {
-        size_t i;
-        for (i = 0; i < num; i++) {
-            prmap_t *map = &maps[i];
+    iter->idx = iter->num = 0;
+    return 0;
+}
 
-            if (map->pr_vaddr <= addr && addr < map->pr_vaddr + map->pr_size) {
-                int prot = 0;
-                if (map->pr_mflags & MA_READ) {
-                    prot |= PROT_READ;
-                }
-                if (map->pr_mflags & MA_WRITE) {
-                    prot |= PROT_WRITE;
-                }
-                if (map->pr_mflags & MA_EXEC) {
-                    prot |= PROT_EXEC;
-                }
-                if (prot == 0) {
-                    set_errmsg("Unknown pr_mflags 0x%x at %p", map->pr_mflags, (void*)addr);
-                }
-                fclose(fp);
-                return prot;
-            }
+static int mem_prot_next(mem_prot_iter_t *iter, mem_prot_t *mem_prot)
+{
+    prmap_t *map;
+
+    if (iter->idx == iter->num) {
+        iter->num = fread(iter->maps, sizeof(iter->maps[0]), sizeof(iter->maps) / sizeof(iter->maps[0]), iter->fp);
+        if (iter->num == 0) {
+            return -1;
         }
+        iter->idx = 0;
+    }
+    map = &iter->maps[iter->idx++];
+    mem_prot->start = map->pr_vaddr;
+    mem_prot->end = map->pr_vaddr + map->pr_size;
+    mem_prot->prot = 0;
+    if (map->pr_mflags & MA_READ) {
+        mem_prot->prot |= PROT_READ;
+    }
+    if (map->pr_mflags & MA_WRITE) {
+        mem_prot->prot |= PROT_WRITE;
+    }
+    if (map->pr_mflags & MA_EXEC) {
+        mem_prot->prot |= PROT_EXEC;
     }
-    fclose(fp);
-    set_errmsg("Could not find memory region containing %p", (void*)addr);
     return 0;
 }
+
+static void mem_prot_end(mem_prot_iter_t *iter)
+{
+    if (iter->fp != NULL) {
+        fclose(iter->fp);
+    }
+}
 #else
 #error Unsupported platform
 #endif
@@ -572,7 +601,11 @@ static int plthook_open_real(plthook_t **plthook_out, struct link_map *lmap)
     dyn_addr_base = (const char*)lmap->l_addr;
 #endif
 #elif defined __FreeBSD__ || defined __sun
+#if __FreeBSD__ >= 13
+    const Elf_Ehdr *ehdr = (const Elf_Ehdr*)lmap->l_base;
+#else
     const Elf_Ehdr *ehdr = (const Elf_Ehdr*)lmap->l_addr;
+#endif
     int rv_ = check_elf_header(ehdr);
     if (rv_ != 0) {
         return rv_;
@@ -666,6 +699,9 @@ static int plthook_open_real(plthook_t **plthook_out, struct link_map *lmap)
         return PLTHOOK_INTERNAL_ERROR;
     }
 #endif
+    if (plthook_set_mem_prot(&plthook)) {
+        return PLTHOOK_INTERNAL_ERROR;
+    }
 
     *plthook_out = malloc(sizeof(plthook_t));
     if (*plthook_out == NULL) {
@@ -676,6 +712,53 @@ static int plthook_open_real(plthook_t **plthook_out, struct link_map *lmap)
     return 0;
 }
 
+static int plthook_set_mem_prot(plthook_t *plthook)
+{
+    unsigned int pos = 0;
+    const char *name;
+    void **addr;
+    size_t start = (size_t)-1;
+    size_t end = 0;
+    mem_prot_iter_t iter;
+    mem_prot_t mem_prot;
+    int idx = 0;
+
+    while (plthook_enum(plthook, &pos, &name, &addr) == 0) {
+        if (start > (size_t)addr) {
+            start = (size_t)addr;
+        }
+        if (end < (size_t)addr) {
+            end = (size_t)addr;
+        }
+    }
+    end++;
+
+    if (mem_prot_begin(&iter) != 0) {
+        return PLTHOOK_INTERNAL_ERROR;
+    }
+    while (mem_prot_next(&iter, &mem_prot) == 0 && idx < NUM_MEM_PROT) {
+        if (mem_prot.prot != 0 && mem_prot.start < end && start < mem_prot.end) {
+            plthook->mem_prot[idx++] = mem_prot;
+        }
+    }
+    mem_prot_end(&iter);
+    return 0;
+}
+
+static int plthook_get_mem_prot(plthook_t *plthook, void *addr)
+{
+    mem_prot_t *ptr = plthook->mem_prot;
+    mem_prot_t *end = ptr + NUM_MEM_PROT;
+
+    while (ptr < end && ptr->prot != 0) {
+        if (ptr->start <= (size_t)addr && (size_t)addr < ptr->end) {
+            return ptr->prot;
+        }
+        ++ptr;
+    }
+    return 0;
+}
+
 #if defined __FreeBSD__ || defined __sun
 static int check_elf_header(const Elf_Ehdr *ehdr)
 {
@@ -742,12 +825,20 @@ static int check_rel(const plthook_t *plthook, const Elf_Plt_Rel *plt, Elf_Xword
 }
 
 int plthook_enum(plthook_t *plthook, unsigned int *pos, const char **name_out, void ***addr_out)
+{
+    return plthook_enum_with_prot(plthook, pos, name_out, addr_out, NULL);
+}
+
+int plthook_enum_with_prot(plthook_t *plthook, unsigned int *pos, const char **name_out, void ***addr_out, int *prot)
 {
     while (*pos < plthook->rela_plt_cnt) {
         const Elf_Plt_Rel *plt = plthook->rela_plt + *pos;
         int rv = check_rel(plthook, plt, R_JUMP_SLOT, name_out, addr_out);
         (*pos)++;
         if (rv >= 0) {
+            if (rv == 0 && prot != NULL) {
+                *prot = plthook_get_mem_prot(plthook, *addr_out);
+            }
             return rv;
         }
     }
@@ -757,6 +848,9 @@ int plthook_enum(plthook_t *plthook, unsigned int *pos, const char **name_out, v
         int rv = check_rel(plthook, plt, R_GLOBAL_DATA, name_out, addr_out);
         (*pos)++;
         if (rv >= 0) {
+            if (rv == 0 && prot != NULL) {
+                *prot = plthook_get_mem_prot(plthook, *addr_out);
+            }
             return rv;
         }
     }
@@ -781,8 +875,10 @@ int plthook_replace(plthook_t *plthook, const char *funcname, void *funcaddr, vo
     while ((rv = plthook_enum(plthook, &pos, &name, &addr)) == 0) {
         if (strncmp(name, funcname, funcnamelen) == 0) {
             if (name[funcnamelen] == '\0' || name[funcnamelen] == '@') {
-                int prot = get_memory_permission(addr);
+                int prot = plthook_get_mem_prot(plthook, addr);
                 if (prot == 0) {
+                    set_errmsg("Could not get the process memory permission at %p",
+                             ALIGN_ADDR(addr));
                     return PLTHOOK_INTERNAL_ERROR;
                 }
                 if (!(prot & PROT_WRITE)) {
diff --git a/ext/oci8/plthook_osx.c b/ext/oci8/plthook_osx.c
index 4b4a5aab..e6af2732 100644
--- a/ext/oci8/plthook_osx.c
+++ b/ext/oci8/plthook_osx.c
@@ -41,6 +41,7 @@
 #include <inttypes.h>
 #include <dlfcn.h>
 #include <errno.h>
+#include <mach/mach.h>
 #include <mach-o/dyld.h>
 #include <sys/mman.h>
 #include <mach-o/fixup-chains.h>
@@ -152,9 +153,17 @@ typedef struct {
     void **addr;
 } bind_address_t;
 
+typedef struct mem_prot {
+    size_t start;
+    size_t end;
+    int prot;
+} mem_prot_t;
+
+#define NUM_MEM_PROT 100
+
 struct plthook {
     unsigned int num_entries;
-    int readonly_segment;
+    mem_prot_t mem_prot[NUM_MEM_PROT];
     bind_address_t entries[1]; /* This must be the last. */
 };
 
@@ -174,6 +183,8 @@ static int plthook_open_real(plthook_t **plthook_out, uint32_t image_idx, const
 static unsigned int set_bind_addrs(data_t *d, uint32_t lazy_bind_off, uint32_t lazy_bind_size);
 static void set_bind_addr(data_t *d, unsigned int *idx, const char *sym_name, int seg_index, int seg_offset);
 static int read_chained_fixups(data_t *d, const struct mach_header *mh, const char *image_name);
+static int set_mem_prot(plthook_t *plthook);
+static int get_mem_prot(plthook_t *plthook, void *addr);
 
 static void set_errmsg(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
 
@@ -511,6 +522,7 @@ static int plthook_open_real(plthook_t **plthook_out, uint32_t image_idx, const
         data.plthook->num_entries = nbind;
         set_bind_addrs(&data, lazy_bind_off, lazy_bind_size);
     }
+    set_mem_prot(data.plthook);
 
     *plthook_out = data.plthook;
     return 0;
@@ -666,7 +678,6 @@ static int read_chained_fixups(data_t *d, const struct mach_header *mh, const ch
         goto cleanup;
     }
     d->plthook->num_entries = header->imports_count;
-    d->plthook->readonly_segment = 1;
 
     switch (header->imports_format) {
     case DYLD_CHAINED_IMPORT:
@@ -967,7 +978,64 @@ static int read_chained_fixups(data_t *d, const struct mach_header *mh, const ch
     return rv;
 }
 
+static int set_mem_prot(plthook_t *plthook)
+{
+    unsigned int pos = 0;
+    const char *name;
+    void **addr;
+    size_t start = (size_t)-1;
+    size_t end = 0;
+    mach_port_t task = mach_task_self();
+    vm_address_t vm_addr = 0;
+    vm_size_t vm_size;
+    vm_region_basic_info_data_64_t info;
+    mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
+    memory_object_name_t object = 0;
+    int idx = 0;
+
+    while (plthook_enum(plthook, &pos, &name, &addr) == 0) {
+        if (start > (size_t)addr) {
+            start = (size_t)addr;
+        }
+        if (end < (size_t)addr) {
+            end = (size_t)addr;
+        }
+    }
+    end++;
+
+    while (vm_region_64(task, &vm_addr, &vm_size, VM_REGION_BASIC_INFO_64, (vm_region_info_t)&info, &info_count, &object) == KERN_SUCCESS) {
+        mem_prot_t mem_prot = {vm_addr, vm_addr + vm_size, info.protection & (PROT_READ | PROT_WRITE | PROT_EXEC)};
+        if (mem_prot.prot != 0 && mem_prot.start < end && start < mem_prot.end) {
+            plthook->mem_prot[idx++] = mem_prot;
+            if (idx == NUM_MEM_PROT) {
+                break;
+            }
+        }
+        vm_addr += vm_size;
+    }
+    return 0;
+}
+
+static int get_mem_prot(plthook_t *plthook, void *addr)
+{
+    mem_prot_t *ptr = plthook->mem_prot;
+    mem_prot_t *end = ptr + NUM_MEM_PROT;
+
+    while (ptr < end && ptr->prot != 0) {
+        if (ptr->start <= (size_t)addr && (size_t)addr < ptr->end) {
+            return ptr->prot;
+        }
+        ++ptr;
+    }
+    return 0;
+}
+
 int plthook_enum(plthook_t *plthook, unsigned int *pos, const char **name_out, void ***addr_out)
+{
+    return plthook_enum_with_prot(plthook, pos, name_out, addr_out, NULL);
+}
+
+int plthook_enum_with_prot(plthook_t *plthook, unsigned int *pos, const char **name_out, void ***addr_out, int *prot)
 {
     if (*pos >= plthook->num_entries) {
         *name_out = NULL;
@@ -977,6 +1045,9 @@ int plthook_enum(plthook_t *plthook, unsigned int *pos, const char **name_out, v
     *name_out = plthook->entries[*pos].name;
     *addr_out = plthook->entries[*pos].addr;
     (*pos)++;
+    if (prot != NULL) {
+        *prot = get_mem_prot(plthook, *addr_out);
+    }
     return 0;
 }
 
@@ -1020,7 +1091,12 @@ int plthook_replace(plthook_t *plthook, const char *funcname, void *funcaddr, vo
         if (oldfunc) {
             *oldfunc = *addr;
         }
-        if (plthook->readonly_segment) {
+        int prot = get_mem_prot(plthook, addr);
+        if (prot == 0) {
+            set_errmsg("Could not get the process memory permission at %p", addr);
+            return PLTHOOK_INTERNAL_ERROR;
+        }
+        if (!(prot & PROT_WRITE)) {
             size_t page_size = sysconf(_SC_PAGESIZE);
             void *base = (void*)((size_t)addr & ~(page_size - 1));
             if (mprotect(base, page_size, PROT_READ | PROT_WRITE) != 0) {
@@ -1028,7 +1104,7 @@ int plthook_replace(plthook_t *plthook, const char *funcname, void *funcaddr, vo
                 return PLTHOOK_INTERNAL_ERROR;
             }
             *addr = funcaddr;
-            mprotect(base, page_size, PROT_READ);
+            mprotect(base, page_size, prot);
         } else {
             *addr = funcaddr;
         }