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Almost all image consumers do not need to modify the content of the
image. Now that the image data is a pointer type (rather than the
opaque userptr_t type), we can rely on the compiler to enforce this at
build time.
Change the .data field to be a const pointer, so that the compiler can
verify that image consumers do not modify the image content. Provide
a transparent .rwdata field for consumers who have a legitimate (and
now explicit) reason to modify the image content.
We do not attempt to impose any runtime restriction on checking
whether or not an image is writable. The only existing instances of
genuinely read-only images are the various unit test images, and it is
acceptable for defective test cases to result in a segfault rather
than a runtime error.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove the now-redundant copy_from_user() and copy_to_user() wrapper
functions.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The memcpy_user(), memmove_user(), memcmp_user(), memset_user(), and
strlen_user() functions are now just straightforward wrappers around
the corresponding standard library functions.
Remove these redundant wrappers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The current usage pattern of image_probe() is a legacy from the time
before commit 34b6ecb ("[image] Simplify image management") when
loading an image to its executable location in memory was a separate
action from actually executing the image.
Call image_probe() as soon as an image is registered. This allows
"imgstat" to display image type information for all images and allows
image-consuming code to assume that image->type is already set
correctly.
Ignore failures if image_probe() does not recognise the image, since
we do expect to handle unrecognised images (initrds, modules, etc).
Unrecognised images will be left with a NULL image->type, which
image-consuming code can easily check.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Relicense files for which I am the sole author (as identified by
util/relicense.pl).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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