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authorMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>2014-06-11 14:18:02 +0530
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-06-11 19:15:13 +1000
commite75ad93afcd34a7ed472d64fb2944560ad9cad4e (patch)
treea5fe95a4867a0e8047872b6b792cf317477a56d1 /fs/qnx4
parent2749a2f26a7c7eb4c7e3901695c8977cdb6b826d (diff)
powerpc/book3s: Add stack overflow check in machine check handler.
Currently machine check handler does not check for stack overflow for nested machine check. If we hit another MCE while inside the machine check handler repeatedly from same address then we get into risk of stack overflow which can cause huge memory corruption. This patch limits the nested MCE level to 4 and panic when we cross level 4. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'fs/qnx4')
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