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17 May 2024, 11:00:25 UTC
Revision b892cb873ced2af57dc5a018557d128c53ed6ae0 authored by Baoquan He on 27 June 2017, 12:39:05 UTC, committed by Ingo Molnar on 30 June 2017, 06:53:14 UTC 
x86/boot/KASLR: Add checking for the offset of kernel virtual address randomization
 
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>
1 parent 80c65fd
History
Tip revision: b892cb873ced2af57dc5a018557d128c53ed6ae0 authored by Baoquan He on 27 June 2017, 12:39:05 UTC
x86/boot/KASLR: Add checking for the offset of kernel virtual address randomization
Tip revision: b892cb8
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.cocciconfig -rw-r--r-- 59 bytes
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