Helge Deller ca6b1b3e03
task_stack: Fix end_of_stack() for architectures with upwards-growing stack ...
[ Upstream commit 9cc2fa4f4a92ccc6760d764e7341be46ee8aaaa1 ]
The function end_of_stack() returns a pointer to the last entry of a
stack. For architectures like parisc where the stack grows upwards
return the pointer to the highest address in the stack.
Without this change I faced a crash on parisc, because the stackleak
functionality wrote STACKLEAK_POISON to the lowest address and thus
overwrote the first 4 bytes of the task_struct which included the
TIF_FLAGS.
Signed-off-by: Helge Deller <deller@gmx.de >
Signed-off-by: Sasha Levin <sashal@kernel.org >
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