[PATCH 4.19 54/79] arm64/signal: Raise limit on stack frames

From: Greg Kroah-Hartman
Date: Tue Sep 13 2022 - 11:12:24 EST

From: Mark Brown <broonie@xxxxxxxxxx>

[ Upstream commit 7ddcaf78e93c9282b4d92184f511b4d5bee75355 ]

The signal code has a limit of 64K on the size of a stack frame that it
will generate, if this limit is exceeded then a process will be killed if
it receives a signal. Unfortunately with the advent of SME this limit is
too small - the maximum possible size of the ZA register alone is 64K. This
is not an issue for practical systems at present but is easily seen using
virtual platforms.

Raise the limit to 256K, this is substantially more than could be used by
any current architecture extension.

Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Link: https://lore.kernel.org/r/20220817182324.638214-2-broonie@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
arch/arm64/kernel/signal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index ca565853dea64..bd9b36ab35f0f 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -101,7 +101,7 @@ static size_t sigframe_size(struct rt_sigframe_user_layout const *user)
* not taken into account. This limit is not a guarantee and is

static int __sigframe_alloc(struct rt_sigframe_user_layout *user,
unsigned long *offset, size_t size, bool extend)