mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![]() We've been keeping that field in thread_struct for a while, it contains the "limit" of the current stack pointer and is meant to be used for detecting stack overflows. It has a few problems however: - First, it was never actually *used* on 64-bit. Set and updated but not actually exploited - When switching stack to/from irq and softirq stacks, it's update is racy unless we hard disable interrupts, which is costly. This is fine on 32-bit as we don't soft-disable there but not on 64-bit. Thus rather than fixing 2 in order to implement 1 in some hypothetical future, let's remove the code completely from 64-bit. In order to avoid a clutter of ifdef's, we remove the updates from C code completely during interrupt stack switching, and instead maintain it from the asm helper that is used to do the stack switching in the first place. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> |
||
---|---|---|
.. | ||
alloc.c | ||
checksum_32.S | ||
checksum_64.S | ||
checksum_wrappers_64.c | ||
code-patching.c | ||
copy_32.S | ||
copypage_64.S | ||
copypage_power7.S | ||
copyuser_64.S | ||
copyuser_power7.S | ||
crtsavres.S | ||
devres.c | ||
div64.S | ||
feature-fixups-test.S | ||
feature-fixups.c | ||
hweight_64.S | ||
ldstfp.S | ||
locks.c | ||
Makefile | ||
mem_64.S | ||
memcpy_64.S | ||
memcpy_power7.S | ||
rheap.c | ||
sstep.c | ||
string.S | ||
string_64.S | ||
usercopy_64.c | ||
vmx-helper.c |