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authorAndreas Schwab <schwab@suse.de>2019-10-09 17:46:47 +0200
committerAndreas Schwab <schwab@suse.de>2019-10-16 15:54:44 +0200
commit58e8f5fd2ba47b6dc47fd4d0a35e4175c7c87aaa (patch)
treefa4ce3fca5be8422abccaf5af6c6d58a1af075d9 /elf/readelflib.c
parente7c8ffe4ec059da1523c093d6a240cd87d154df2 (diff)
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ldconfig: handle .dynstr located in separate segment (bug 25087)
To determine the load offset of the DT_STRTAB section search for the
segment containing it, instead of using the load offset of the first
segment.
Diffstat (limited to 'elf/readelflib.c')
-rw-r--r--elf/readelflib.c36
1 files changed, 23 insertions, 13 deletions
diff --git a/elf/readelflib.c b/elf/readelflib.c
index 09f5858426..499cccbcfc 100644
--- a/elf/readelflib.c
+++ b/elf/readelflib.c
@@ -45,7 +45,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 {
   int i;
   unsigned int j;
-  ElfW(Addr) loadaddr;
   unsigned int dynamic_addr;
   size_t dynamic_size;
   char *program_interpreter;
@@ -87,7 +86,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
      libc5/libc6.  */
   *flag = FLAG_ELF;
 
-  loadaddr = -1;
   dynamic_addr = 0;
   dynamic_size = 0;
   program_interpreter = NULL;
@@ -98,11 +96,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 
       switch (segment->p_type)
 	{
-	case PT_LOAD:
-	  if (loadaddr == (ElfW(Addr)) -1)
-	    loadaddr = segment->p_vaddr - segment->p_offset;
-	  break;
-
 	case PT_DYNAMIC:
 	  if (dynamic_addr)
 	    error (0, 0, _("more than one dynamic segment\n"));
@@ -176,11 +169,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 	}
 
     }
-  if (loadaddr == (ElfW(Addr)) -1)
-    {
-      /* Very strange. */
-      loadaddr = 0;
-    }
 
   /* Now we can read the dynamic sections.  */
   if (dynamic_size == 0)
@@ -197,7 +185,29 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
       check_ptr (dyn_entry);
       if (dyn_entry->d_tag == DT_STRTAB)
 	{
-	  dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val - loadaddr);
+	  /* Find the file offset of the segment containing the dynamic
+	     string table.  */
+	  ElfW(Off) loadoff = -1;
+	  for (i = 0, segment = elf_pheader;
+	       i < elf_header->e_phnum; i++, segment++)
+	    {
+	      if (segment->p_type == PT_LOAD
+		  && dyn_entry->d_un.d_val >= segment->p_vaddr
+		  && (dyn_entry->d_un.d_val - segment->p_vaddr
+		      < segment->p_filesz))
+		{
+		  loadoff = segment->p_vaddr - segment->p_offset;
+		  break;
+		}
+	    }
+	  if (loadoff == (ElfW(Off)) -1)
+	    {
+	      /* Very strange. */
+	      loadoff = 0;
+	    }
+
+	  dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val
+				      - loadoff);
 	  check_ptr (dynamic_strings);
 	  break;
 	}