1 files changed, 104 insertions, 0 deletions
diff --git a/libelf/gelf_update_dyn.c b/libelf/gelf_update_dyn.c
new file mode 100644
index 00000000..b066fd62
--- /dev/null
+++ b/libelf/gelf_update_dyn.c
@@ -0,0 +1,104 @@
+/* Update information in dynamic table at the given index.
+   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2000.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, version 2.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <gelf.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+int
+gelf_update_dyn (data, ndx, src)
+     Elf_Data *data;
+     int ndx;
+     GElf_Dyn *src;
+{
+  Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
+  Elf_Scn *scn;
+  int result = 0;
+
+  if (data == NULL)
+    return 0;
+
+  if (unlikely (ndx < 0))
+    {
+      __libelf_seterrno (ELF_E_INVALID_INDEX);
+      return 0;
+    }
+
+  if (unlikely (data_scn->d.d_type != ELF_T_DYN))
+    {
+      /* The type of the data better should match.  */
+      __libelf_seterrno (ELF_E_DATA_MISMATCH);
+      return 0;
+    }
+
+  scn = data_scn->s;
+  rwlock_wrlock (scn->elf->lock);
+
+  if (scn->elf->class == ELFCLASS32)
+    {
+      Elf32_Dyn *dyn;
+
+      /* There is the possibility that the values in the input are
+	 too large.  */
+      if (unlikely (src->d_tag < -0x80000000ll)
+	  || unlikely (src->d_tag > 0x7fffffffll)
+	  || unlikely (src->d_un.d_val > 0xffffffffull))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_DATA);
+	  goto out;
+	}
+
+      /* Check whether we have to resize the data buffer.  */
+      if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  goto out;
+	}
+
+      dyn = &((Elf32_Dyn *) data_scn->d.d_buf)[ndx];
+
+      dyn->d_tag = src->d_tag;
+      dyn->d_un.d_val = src->d_un.d_val;
+    }
+  else
+    {
+      /* Check whether we have to resize the data buffer.  */
+      if (unlikely ((ndx + 1) * sizeof (Elf64_Dyn) > data_scn->d.d_size))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  goto out;
+	}
+
+      ((Elf64_Dyn *) data_scn->d.d_buf)[ndx] = *src;
+    }
+
+  result = 1;
+
+  /* Mark the section as modified.  */
+  scn->flags |= ELF_F_DIRTY;
+
+ out:
+  rwlock_unlock (scn->elf->lock);
+
+  return result;
+}