From: Will Deacon <will.deacon@xxxxxxx>
[ Upstream commit 24951465cbd279f60b1fdc2421b3694405bcff42 ]
arch/arm/ defines a SIGMINSTKSZ of 2k, so we should use the same value
for compat tasks.
Cc: <stable@xxxxxxxxxxxxxxx> # 4.9+
Cc: Aurelien Jarno <aurelien@xxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Reviewed-by: Dave Martin <Dave.Martin@xxxxxxx>
Reported-by: Steve McIntyre <steve.mcintyre@xxxxxxx>
Tested-by: Steve McIntyre <93sam@xxxxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
Aurelien points out that this didn't get selected for -stable despite its
counterpart (22839869f21a ("signal: Introduce COMPAT_SIGMINSTKSZ for use
in compat_sys_sigaltstack")) being backported to 4.9. Oops.
arch/arm64/include/asm/compat.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
index 1a037b94eba1..cee28a05ee98 100644
--- a/arch/arm64/include/asm/compat.h
+++ b/arch/arm64/include/asm/compat.h
@@ -159,6 +159,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
}
#define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
+#define COMPAT_MINSIGSTKSZ 2048
static inline void __user *arch_compat_alloc_user_space(long len)
{
--
2.11.0
