kernel: Fixed potential null pointer issue with current->mm in kernel version 5.10

When calling get_full_comm() within system call hooks, current->mm may be null (prctl). A fallback mechanism for current->comm must be added beforehand to prevent null pointer dereferences when accessing mm->arg_start/arg_end.

Signed-off-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>

kernel/sulog.h

@@ -4,11 +4,7 @@
 #include <linux/types.h>
 #include <linux/version.h>
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 245)
 #define __SULOG_GATE        1
-#else
-#define __SULOG_GATE        0
-#endif
 
 #if __SULOG_GATE
 extern struct timezone sys_tz;