vfs: define a generic function to read a file from the kernel
For a while it was looked down upon to directly read files from Linux. These days there exists a few mechanisms in the kernel that do just this though to load a file into a local buffer. There are minor but important checks differences on each. This patch set is the first attempt at resolving some of these differences. This patch introduces a common function for reading files from the kernel with the corresponding security post-read hook and function. Changelog v4+: - export security_kernel_post_read_file() - Fengguang Wu v3: - additional bounds checking - Luis v2: - To simplify patch review, re-ordered patches Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Reviewed-by: Luis R. Rodriguez <mcgrof@suse.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@zeniv.linux.org.uk>
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@ -910,6 +910,12 @@ int security_kernel_module_from_file(struct file *file)
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return ima_module_check(file);
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}
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int security_kernel_post_read_file(struct file *file, char *buf, loff_t size)
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{
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return call_int_hook(kernel_post_read_file, 0, file, buf, size);
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}
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EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
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int security_task_fix_setuid(struct cred *new, const struct cred *old,
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int flags)
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{
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@ -1697,6 +1703,8 @@ struct security_hook_heads security_hook_heads = {
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LIST_HEAD_INIT(security_hook_heads.kernel_module_request),
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.kernel_module_from_file =
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LIST_HEAD_INIT(security_hook_heads.kernel_module_from_file),
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.kernel_post_read_file =
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LIST_HEAD_INIT(security_hook_heads.kernel_post_read_file),
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.task_fix_setuid =
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LIST_HEAD_INIT(security_hook_heads.task_fix_setuid),
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.task_setpgid = LIST_HEAD_INIT(security_hook_heads.task_setpgid),
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