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| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-02-19 09:32:55 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-06-03 16:58:53 -0400 |
| commit | 8861fd576ecf96450f42f3eb4b56cad5bf12188a (patch) | |
| tree | 6c6e9ea08792d91adc5be799f3c7cbe9d8c7a570 /fs/binfmt_flat.c | |
| parent | 0abb013e2e73c40bd196413b49651b29e1b7dafb (diff) | |
| download | linux-8861fd576ecf96450f42f3eb4b56cad5bf12188a.tar.gz | |
binfmt_flat: don't use __put_user()
... and check the return value
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/binfmt_flat.c')
| -rw-r--r-- | fs/binfmt_flat.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index 831a2b25ba79..7b663ed5247b 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -138,35 +138,40 @@ static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; sp = (unsigned long __user *)current->mm->start_stack; - __put_user(bprm->argc, sp++); + if (put_user(bprm->argc, sp++)) + return -EFAULT; if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { unsigned long argv, envp; argv = (unsigned long)(sp + 2); envp = (unsigned long)(sp + 2 + bprm->argc + 1); - __put_user(argv, sp++); - __put_user(envp, sp++); + if (put_user(argv, sp++) || put_user(envp, sp++)) + return -EFAULT; } current->mm->arg_start = (unsigned long)p; for (i = bprm->argc; i > 0; i--) { - __put_user((unsigned long)p, sp++); + if (put_user((unsigned long)p, sp++)) + return -EFAULT; len = strnlen_user(p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } - __put_user(0, sp++); + if (put_user(0, sp++)) + return -EFAULT; current->mm->arg_end = (unsigned long)p; current->mm->env_start = (unsigned long) p; for (i = bprm->envc; i > 0; i--) { - __put_user((unsigned long)p, sp++); + if (put_user((unsigned long)p, sp++)) + return -EFAULT; len = strnlen_user(p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } - __put_user(0, sp++); + if (put_user(0, sp++)) + return -EFAULT; current->mm->env_end = (unsigned long)p; return 0; @@ -998,7 +1003,8 @@ static int load_flat_binary(struct linux_binprm *bprm) unsigned long __user *sp; current->mm->start_stack -= sizeof(unsigned long); sp = (unsigned long __user *)current->mm->start_stack; - __put_user(start_addr, sp); + if (put_user(start_addr, sp)) + return -EFAULT; start_addr = libinfo.lib_list[i].entry; } } |