tree fa29c8aaef547723cb5f5f81fe60d441947481b6
parent 9a596a6236e1b4d6c2e6105bd85eac19c9f4ec4c
author Haavard Skinnemoen <hskinnemoen@atmel.com> 1172059686 +0100
committer Haavard Skinnemoen <hskinnemoen@atmel.com> 1173261027 +0100

[AVR32] show_trace: Only walk valid stack addresses

Terminate the frame pointer walk if (a) the address is outside the
task's kernel stack or (b) if the frame pointer isn't monotonically
increasing. Without this fix, show_trace() may enter an infinite
loop, walking through random data anywhere in memory.

Since any address within the kernel stack is guaranteed to be valid,
we may eliminate the __get_user() calls as well.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>