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LSM: Add "contents" flag to kernel_read_file hook

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As with the kernel_load_data LSM hook, add a "contents" flag to the
kernel_read_file LSM hook that indicates whether the LSM can expect
a matching call to the kernel_post_read_file LSM hook with the full
contents of the file. With the coming addition of partial file read
support for kernel_read_file*() API, the LSM will no longer be able
to always see the entire contents of a file during the read calls.

For cases where the LSM must read examine the complete file contents,
it will need to do so on its own every time the kernel_read_file
hook is called with contents=false (or reject such cases). Adjust all
existing LSMs to retain existing behavior.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Link: https://lore.kernel.org/r/20201002173828.2099543-12-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook
2020-10-02 10:38:23 -07:00
committed by Greg Kroah-Hartman
parent 38f901735a
commit 2039bda1fa
9 changed files with 41 additions and 14 deletions
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7
security/security.c
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@@ -1672,14 +1672,15 @@ int security_kernel_module_request(char *kmod_name)
return integrity_kernel_module_request(kmod_name);
}
int security_kernel_read_file(struct file *file, enum kernel_read_file_id id)
int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
bool contents)
{
int ret;
ret = call_int_hook(kernel_read_file, 0, file, id);
ret = call_int_hook(kernel_read_file, 0, file, id, contents);
if (ret)
return ret;
return ima_read_file(file, id);
return ima_read_file(file, id, contents);
}
EXPORT_SYMBOL_GPL(security_kernel_read_file);