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b892cb873c
For kernel text KASLR, the virtual address is confined to area of 1G, [0xffffffff80000000, 0xffffffffc0000000). For the implemenataion of virtual address randomization, we only randomize to get an offset between 16M and 1G, then add this offset to the starting address, 0xffffffff80000000. Here 16M is the offset which is decided at linking stage. So the amount of the local variable 'virt_addr' which respresents the offset plus the kernel output size can not exceed KERNEL_IMAGE_SIZE. Add a debug check for the offset. If out of bounds, print error message and hang there. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Baoquan He <bhe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1498567146-11990-2-git-send-email-bhe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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