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add alignment check of virtual address to exec()

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MikeCAT 2015-12-19 23:43:56 +09:00 committed by Frans Kaashoek
parent a7c03bd914
commit 67a7f9597e
1 changed files with 2 additions and 0 deletions
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exec.c
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@ -46,6 +46,8 @@ exec(char *path, char **argv)
goto bad; 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)
goto bad;
if(loaduvm(pgdir, (char*)ph.vaddr, ip, ph.off, ph.filesz) < 0) if(loaduvm(pgdir, (char*)ph.vaddr, ip, ph.off, ph.filesz) < 0)
goto bad; goto bad;
} }