diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2006-12-06 20:36:35 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:33 -0800 |
| commit | 841d5fb7c75260f76ae682648b28a3dca724940d (patch) | |
| tree | 126dd9c646f384674c2cb99080c980fad209278b /fs | |
| parent | fec1d0115240593b39898289e6e1413ea6e44a84 (diff) | |
| download | lwn-841d5fb7c75260f76ae682648b28a3dca724940d.tar.gz lwn-841d5fb7c75260f76ae682648b28a3dca724940d.zip | |
[PATCH] binfmt: fix uaccess handling
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/binfmt_elf.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index b2efbaead6c3..68e20d5bfe1b 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -243,8 +243,9 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, if (interp_aout) { argv = sp + 2; envp = argv + argc + 1; - __put_user((elf_addr_t)(unsigned long)argv, sp++); - __put_user((elf_addr_t)(unsigned long)envp, sp++); + if (__put_user((elf_addr_t)(unsigned long)argv, sp++) || + __put_user((elf_addr_t)(unsigned long)envp, sp++)) + return -EFAULT; } else { argv = sp; envp = argv + argc + 1; @@ -254,7 +255,8 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, p = current->mm->arg_end = current->mm->arg_start; while (argc-- > 0) { size_t len; - __put_user((elf_addr_t)p, argv++); + if (__put_user((elf_addr_t)p, argv++)) + return -EFAULT; len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES); if (!len || len > PAGE_SIZE*MAX_ARG_PAGES) return 0; @@ -265,7 +267,8 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, current->mm->arg_end = current->mm->env_start = p; while (envc-- > 0) { size_t len; - __put_user((elf_addr_t)p, envp++); + if (__put_user((elf_addr_t)p, envp++)) + return -EFAULT; len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES); if (!len || len > PAGE_SIZE*MAX_ARG_PAGES) return 0; |