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add check for wrapping of address + size in exec()

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MikeCAT 2015-12-20 00:04:52 +09:00 committed by Frans Kaashoek
parent 67a7f9597e
commit 5625ae4973
1 changed files with 2 additions and 0 deletions
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exec.c
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@ -44,6 +44,8 @@ exec(char *path, char **argv)
continue; continue;
if(ph.memsz < ph.filesz) if(ph.memsz < ph.filesz)
goto bad; goto bad;
if(ph.vaddr + ph.memsz < ph.vaddr)
goto bad;
if((sz = allocuvm(pgdir, sz, ph.vaddr + ph.memsz)) == 0) if((sz = allocuvm(pgdir, sz, ph.vaddr + ph.memsz)) == 0)
goto bad; goto bad;
if(ph.vaddr % PGSIZE != 0) if(ph.vaddr % PGSIZE != 0)