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fs/kernel_read_file: Add file_size output argument

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In preparation for adding partial read support, add an optional output
argument to kernel_read_file*() that reports the file size so callers
can reason more easily about their reading progress.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Link: https://lore.kernel.org/r/20201002173828.2099543-8-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2020-10-02 10:38:19 -07:00 • committed by Greg Kroah-Hartman
parent 113eeb5177
commit 885352881f
7 changed files with 23 additions and 11 deletions
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2
kernel/module.c
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@ -4048,7 +4048,7 @@ SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
|MODULE_INIT_IGNORE_VERMAGIC))
return -EINVAL;
err = kernel_read_file_from_fd(fd, &hdr, INT_MAX,
err = kernel_read_file_from_fd(fd, &hdr, INT_MAX, NULL,
READING_MODULE);
if (err < 0)
return err;