exec sanity check

2009-05-31 02:11:27 +00:00 · 2009-05-31 02:11:27 +00:00 · 90bab90832
parent f3685aa391
commit 90bab90832
1 changed files with 1 additions and 1 deletions
--- a/exec.c
+++ b/exec.c
@ -62,7 +62,7 @@ exec(char *path, char **argv)
      goto bad;
    if(ph.type != ELF_PROG_LOAD)
      continue;
-    if(ph.va + ph.memsz > sz)
+    if(ph.va + ph.memsz < ph.va || ph.va + ph.memsz > sz || ph.memsz < ph.filesz)
      goto bad;
    if(readi(ip, mem + ph.va, ph.offset, ph.filesz) != ph.filesz)
      goto bad;