1 files changed, 145 insertions, 45 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 3318692e4e76..e8fba959fffb 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -14,6 +14,7 @@
 #define _GNU_SOURCE
 #include <stdio.h>
 #include <ctype.h>
+#include <string.h>
 #include "modpost.h"
 #include "../../include/generated/autoconf.h"
 #include "../../include/linux/license.h"
@@ -253,7 +254,7 @@ static enum export export_no(const char *s)
         return export_unknown;
 }
 
-static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
+static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
 {
         if (sec == elf->export_sec)
                 return export_plain;
@@ -373,6 +374,8 @@ static int parse_elf(struct elf_info *info, const char *filename)
         Elf_Ehdr *hdr;
         Elf_Shdr *sechdrs;
         Elf_Sym  *sym;
+        const char *secstrings;
+        unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
 
         hdr = grab_file(filename, &info->size);
         if (!hdr) {
@@ -417,8 +420,27 @@ static int parse_elf(struct elf_info *info, const char *filename)
                 return 0;
         }
 
+        if (hdr->e_shnum == 0) {
+                /*
+                 * There are more than 64k sections,
+                 * read count from .sh_size.
+                 * note: it doesn't need shndx2secindex()
+                 */
+                info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
+        }
+        else {
+                info->num_sections = hdr->e_shnum;
+        }
+        if (hdr->e_shstrndx == SHN_XINDEX) {
+                info->secindex_strings =
+                    shndx2secindex(TO_NATIVE(sechdrs[0].sh_link));
+        }
+        else {
+                info->secindex_strings = hdr->e_shstrndx;
+        }
+
         /* Fix endianness in section headers */
-        for (i = 0; i < hdr->e_shnum; i++) {
+        for (i = 0; i < info->num_sections; i++) {
                 sechdrs[i].sh_name      = TO_NATIVE(sechdrs[i].sh_name);
                 sechdrs[i].sh_type      = TO_NATIVE(sechdrs[i].sh_type);
                 sechdrs[i].sh_flags     = TO_NATIVE(sechdrs[i].sh_flags);
@@ -431,9 +453,8 @@ static int parse_elf(struct elf_info *info, const char *filename)
                 sechdrs[i].sh_entsize   = TO_NATIVE(sechdrs[i].sh_entsize);
         }
         /* Find symbol table. */
-        for (i = 1; i < hdr->e_shnum; i++) {
-                const char *secstrings
-                        = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+        secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
+        for (i = 1; i < info->num_sections; i++) {
                 const char *secname;
                 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
 
@@ -461,14 +482,26 @@ static int parse_elf(struct elf_info *info, const char *filename)
                 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
                         info->export_gpl_future_sec = i;
 
-                if (sechdrs[i].sh_type != SHT_SYMTAB)
-                        continue;
+                if (sechdrs[i].sh_type == SHT_SYMTAB) {
+                        unsigned int sh_link_idx;
+                        symtab_idx = i;
+                        info->symtab_start = (void *)hdr +
+                            sechdrs[i].sh_offset;
+                        info->symtab_stop  = (void *)hdr +
+                            sechdrs[i].sh_offset + sechdrs[i].sh_size;
+                        sh_link_idx = shndx2secindex(sechdrs[i].sh_link);
+                        info->strtab       = (void *)hdr +
+                            sechdrs[sh_link_idx].sh_offset;
+                }
 
-                info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
-                info->symtab_stop  = (void *)hdr + sechdrs[i].sh_offset
-                                                 + sechdrs[i].sh_size;
-                info->strtab       = (void *)hdr +
-                                     sechdrs[sechdrs[i].sh_link].sh_offset;
+                /* 32bit section no. table? ("more than 64k sections") */
+                if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
+                        symtab_shndx_idx = i;
+                        info->symtab_shndx_start = (void *)hdr +
+                            sechdrs[i].sh_offset;
+                        info->symtab_shndx_stop  = (void *)hdr +
+                            sechdrs[i].sh_offset + sechdrs[i].sh_size;
+                }
         }
         if (!info->symtab_start)
                 fatal("%s has no symtab?\n", filename);
@@ -480,6 +513,21 @@ static int parse_elf(struct elf_info *info, const char *filename)
                 sym->st_value = TO_NATIVE(sym->st_value);
                 sym->st_size  = TO_NATIVE(sym->st_size);
         }
+
+        if (symtab_shndx_idx != ~0U) {
+                Elf32_Word *p;
+                if (symtab_idx !=
+                    shndx2secindex(sechdrs[symtab_shndx_idx].sh_link))
+                        fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
+                              filename,
+                              shndx2secindex(sechdrs[symtab_shndx_idx].sh_link),
+                              symtab_idx);
+                /* Fix endianness */
+                for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
+                     p++)
+                        *p = TO_NATIVE(*p);
+        }
+
         return 1;
 }
 
@@ -503,6 +551,11 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
                     strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
                     strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
                         return 1;
+        if (info->hdr->e_machine == EM_PPC64)
+                /* Special register function linked on all modules during final link of .ko */
+                if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
+                    strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
+                        return 1;
         /* Do not ignore this symbol */
         return 0;
 }
@@ -514,7 +567,7 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
                                Elf_Sym *sym, const char *symname)
 {
         unsigned int crc;
-        enum export export = export_from_sec(info, sym->st_shndx);
+        enum export export = export_from_sec(info, get_secindex(info, sym));
 
         switch (sym->st_shndx) {
         case SHN_COMMON:
@@ -656,19 +709,19 @@ static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
                 return "(unknown)";
 }
 
-static const char *sec_name(struct elf_info *elf, int shndx)
+static const char *sec_name(struct elf_info *elf, int secindex)
 {
         Elf_Shdr *sechdrs = elf->sechdrs;
         return (void *)elf->hdr +
-                elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
-                sechdrs[shndx].sh_name;
+                elf->sechdrs[elf->secindex_strings].sh_offset +
+                sechdrs[secindex].sh_name;
 }
 
 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
 {
         return (void *)elf->hdr +
-                elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
-                sechdr->sh_name;
+                elf->sechdrs[elf->secindex_strings].sh_offset +
+                sechdr->sh_name;
 }
 
 /* if sym is empty or point to a string
@@ -737,6 +790,8 @@ static const char *section_white_list[] =
 {
         ".comment*",
         ".debug*",
+        ".zdebug*",             /* Compressed debug sections. */
+        ".GCC-command-line",    /* mn10300 */
         ".mdebug*",        /* alpha, score, mips etc. */
         ".pdr",            /* alpha, score, mips etc. */
         ".stab*",
@@ -981,6 +1036,13 @@ static const struct sectioncheck *section_mismatch(
  *   fromsec = .data*
  *   atsym   =__param*
  *
+ * Pattern 1a:
+ *   module_param_call() ops can refer to __init set function if permissions=0
+ *   The pattern is identified by:
+ *   tosec   = .init.text
+ *   fromsec = .data*
+ *   atsym   = __param_ops_*
+ *
  * Pattern 2:
  *   Many drivers utilise a *driver container with references to
  *   add, remove, probe functions etc.
@@ -1015,6 +1077,12 @@ static int secref_whitelist(const struct sectioncheck *mismatch,
             (strncmp(fromsym, "__param", strlen("__param")) == 0))
                 return 0;
 
+        /* Check for pattern 1a */
+        if (strcmp(tosec, ".init.text") == 0 &&
+            match(fromsec, data_sections) &&
+            (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
+                return 0;
+
         /* Check for pattern 2 */
         if (match(tosec, init_exit_sections) &&
             match(fromsec, data_sections) &&
@@ -1047,11 +1115,14 @@ static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
         Elf_Sym *near = NULL;
         Elf64_Sword distance = 20;
         Elf64_Sword d;
+        unsigned int relsym_secindex;
 
         if (relsym->st_name != 0)
                 return relsym;
+
+        relsym_secindex = get_secindex(elf, relsym);
         for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
-                if (sym->st_shndx != relsym->st_shndx)
+                if (get_secindex(elf, sym) != relsym_secindex)
                         continue;
                 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
                         continue;
@@ -1113,9 +1184,9 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
         for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
                 const char *symsec;
 
-                if (sym->st_shndx >= SHN_LORESERVE)
+                if (is_shndx_special(sym->st_shndx))
                         continue;
-                symsec = sec_name(elf, sym->st_shndx);
+                symsec = sec_name(elf, get_secindex(elf, sym));
                 if (strcmp(symsec, sec) != 0)
                         continue;
                 if (!is_valid_name(elf, sym))
@@ -1138,6 +1209,9 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
  * .cpuinit.data => __cpudata
  * .memexitconst => __memconst
  * etc.
+ *
+ * The memory of returned value has been allocated on a heap. The user of this
+ * method should free it after usage.
 */
 static char *sec2annotation(const char *s)
 {
@@ -1160,9 +1234,9 @@ static char *sec2annotation(const char *s)
                         strcat(p, "data ");
                 else
                         strcat(p, " ");
-                return r; /* we leak her but we do not care */
+                return r;
         } else {
-                return "";
+                return strdup("");
         }
 }
 
@@ -1190,6 +1264,8 @@ static void report_sec_mismatch(const char *modname,
 {
         const char *from, *from_p;
         const char *to, *to_p;
+        char *prl_from;
+        char *prl_to;
 
         switch (from_is_func) {
         case 0: from = "variable"; from_p = "";   break;
@@ -1213,16 +1289,21 @@ static void report_sec_mismatch(const char *modname,
 
         switch (mismatch->mismatch) {
         case TEXT_TO_ANY_INIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The function %s%s() references\n"
                 "the %s %s%s%s.\n"
                 "This is often because %s lacks a %s\n"
                 "annotation or the annotation of %s is wrong.\n",
-                sec2annotation(fromsec), fromsym,
-                to, sec2annotation(tosec), tosym, to_p,
-                fromsym, sec2annotation(tosec), tosym);
+                prl_from, fromsym,
+                to, prl_to, tosym, to_p,
+                fromsym, prl_to, tosym);
+                free(prl_from);
+                free(prl_to);
                 break;
         case DATA_TO_ANY_INIT: {
+                prl_to = sec2annotation(tosec);
                 const char *const *s = mismatch->symbol_white_list;
                 fprintf(stderr,
                 "The variable %s references\n"
@@ -1230,20 +1311,24 @@ static void report_sec_mismatch(const char *modname,
                 "If the reference is valid then annotate the\n"
                 "variable with __init* or __refdata (see linux/init.h) "
                 "or name the variable:\n",
-                fromsym, to, sec2annotation(tosec), tosym, to_p);
+                fromsym, to, prl_to, tosym, to_p);
                 while (*s)
                         fprintf(stderr, "%s, ", *s++);
                 fprintf(stderr, "\n");
+                free(prl_to);
                 break;
         }
         case TEXT_TO_ANY_EXIT:
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The function %s() references a %s in an exit section.\n"
                 "Often the %s %s%s has valid usage outside the exit section\n"
                 "and the fix is to remove the %sannotation of %s.\n",
-                fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
+                fromsym, to, to, tosym, to_p, prl_to, tosym);
+                free(prl_to);
                 break;
         case DATA_TO_ANY_EXIT: {
+                prl_to = sec2annotation(tosec);
                 const char *const *s = mismatch->symbol_white_list;
                 fprintf(stderr,
                 "The variable %s references\n"
@@ -1251,24 +1336,31 @@ static void report_sec_mismatch(const char *modname,
                 "If the reference is valid then annotate the\n"
                 "variable with __exit* (see linux/init.h) or "
                 "name the variable:\n",
-                fromsym, to, sec2annotation(tosec), tosym, to_p);
+                fromsym, to, prl_to, tosym, to_p);
                 while (*s)
                         fprintf(stderr, "%s, ", *s++);
                 fprintf(stderr, "\n");
+                free(prl_to);
                 break;
         }
         case XXXINIT_TO_SOME_INIT:
         case XXXEXIT_TO_SOME_EXIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The %s %s%s%s references\n"
                 "a %s %s%s%s.\n"
                 "If %s is only used by %s then\n"
                 "annotate %s with a matching annotation.\n",
-                from, sec2annotation(fromsec), fromsym, from_p,
-                to, sec2annotation(tosec), tosym, to_p,
+                from, prl_from, fromsym, from_p,
+                to, prl_to, tosym, to_p,
                 tosym, fromsym, tosym);
+                free(prl_from);
+                free(prl_to);
                 break;
         case ANY_INIT_TO_ANY_EXIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The %s %s%s%s references\n"
                 "a %s %s%s%s.\n"
@@ -1277,11 +1369,15 @@ static void report_sec_mismatch(const char *modname,
                 "uses functionality in the exit path.\n"
                 "The fix is often to remove the %sannotation of\n"
                 "%s%s so it may be used outside an exit section.\n",
-                from, sec2annotation(fromsec), fromsym, from_p,
-                to, sec2annotation(tosec), tosym, to_p,
-                sec2annotation(tosec), tosym, to_p);
+                from, prl_from, fromsym, from_p,
+                to, prl_to, tosym, to_p,
+                prl_to, tosym, to_p);
+                free(prl_from);
+                free(prl_to);
                 break;
         case ANY_EXIT_TO_ANY_INIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The %s %s%s%s references\n"
                 "a %s %s%s%s.\n"
@@ -1290,16 +1386,20 @@ static void report_sec_mismatch(const char *modname,
                 "uses functionality in the init path.\n"
                 "The fix is often to remove the %sannotation of\n"
                 "%s%s so it may be used outside an init section.\n",
-                from, sec2annotation(fromsec), fromsym, from_p,
-                to, sec2annotation(tosec), tosym, to_p,
-                sec2annotation(tosec), tosym, to_p);
+                from, prl_from, fromsym, from_p,
+                to, prl_to, tosym, to_p,
+                prl_to, tosym, to_p);
+                free(prl_from);
+                free(prl_to);
                 break;
         case EXPORT_TO_INIT_EXIT:
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The symbol %s is exported and annotated %s\n"
                 "Fix this by removing the %sannotation of %s "
                 "or drop the export.\n",
-                tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
+                tosym, prl_to, prl_to, tosym);
+                free(prl_to);
                 break;
         }
         fprintf(stderr, "\n");
@@ -1311,7 +1411,7 @@ static void check_section_mismatch(const char *modname, struct elf_info *elf,
         const char *tosec;
         const struct sectioncheck *mismatch;
 
-        tosec = sec_name(elf, sym->st_shndx);
+        tosec = sec_name(elf, get_secindex(elf, sym));
         mismatch = section_mismatch(fromsec, tosec);
         if (mismatch) {
                 Elf_Sym *to;
@@ -1339,10 +1439,10 @@ static unsigned int *reloc_location(struct elf_info *elf,
                                     Elf_Shdr *sechdr, Elf_Rela *r)
 {
         Elf_Shdr *sechdrs = elf->sechdrs;
-        int section = sechdr->sh_info;
+        int section = shndx2secindex(sechdr->sh_info);
 
         return (void *)elf->hdr + sechdrs[section].sh_offset +
-                (r->r_offset - sechdrs[section].sh_addr);
+                r->r_offset;
 }
 
 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
@@ -1447,7 +1547,7 @@ static void section_rela(const char *modname, struct elf_info *elf,
                 r.r_addend = TO_NATIVE(rela->r_addend);
                 sym = elf->symtab_start + r_sym;
                 /* Skip special sections */
-                if (sym->st_shndx >= SHN_LORESERVE)
+                if (is_shndx_special(sym->st_shndx))
                         continue;
                 check_section_mismatch(modname, elf, &r, sym, fromsec);
         }
@@ -1505,7 +1605,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
                 }
                 sym = elf->symtab_start + r_sym;
                 /* Skip special sections */
-                if (sym->st_shndx >= SHN_LORESERVE)
+                if (is_shndx_special(sym->st_shndx))
                         continue;
                 check_section_mismatch(modname, elf, &r, sym, fromsec);
         }
@@ -1515,7 +1615,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
  * A module includes a number of sections that are discarded
  * either when loaded or when used as built-in.
  * For loaded modules all functions marked __init and all data
- * marked __initdata will be discarded when the module has been intialized.
+ * marked __initdata will be discarded when the module has been initialized.
  * Likewise for modules used built-in the sections marked __exit
  * are discarded because __exit marked function are supposed to be called
  * only when a module is unloaded which never happens for built-in modules.
@@ -1530,7 +1630,7 @@ static void check_sec_ref(struct module *mod, const char *modname,
         Elf_Shdr *sechdrs = elf->sechdrs;
 
         /* Walk through all sections */
-        for (i = 0; i < elf->hdr->e_shnum; i++) {
+        for (i = 0; i < elf->num_sections; i++) {
                 check_section(modname, elf, &elf->sechdrs[i]);
                 /* We want to process only relocation sections and not .init */
                 if (sechdrs[i].sh_type == SHT_RELA)