tree c45281186e27d12934b5beec392eb49e9bf80a42
parent 9e58837beefbafecb999ed31a30307e20abf93fb
author Helge Deller <deller@gmx.de> 1633385143 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1637923229 +0100

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>