joerg e835604c26 libprop is currently using a recursive parser. While this is fine for ... userland, deeply nested arrays and dictionaries can easily overflow the kernel stack and thereby force a panic. Fix the internalizer and prop_object_release to use a separate call stack and alter the dictionary and array handling to not recurse on the C stack. The default stack has an inline depth of 16 elements, which should keep the overhead reasonable. This issue was found by Pavel Cahyna and Jachym Holecek. Additionally add a limit for prop_object_copyin_ioctl to prevent user programs from temporary allocating unbound amount of kernel memory. Allow malloc to fail so that tight loops of userland processes can't force panics by exhausting the kernel map. Tested with the sample exploit of Jachym, his test suite and reviewed by himself (initial patch), Christos Zoulas and Jason Thorpe.		2007-08-16 21:44:06 +00:00
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libc	cast to void* to avoid a fatal warning	2007-07-18 16:58:14 +00:00
libprop	libprop is currently using a recursive parser. While this is fine for	2007-08-16 21:44:06 +00:00