Move alignment into event write callback

[lttng-modules.git] / src / probes / lttng-probe-user.c

diff --git a/src/probes/lttng-probe-user.c b/src/probes/lttng-probe-user.c
index 009cfed004c65d124229301365df8582f896db53..91190f7ba6e3152ea643a2c44b28bb7b7b2b97be 100644 (file)
--- a/src/probes/lttng-probe-user.c
+++ b/src/probes/lttng-probe-user.c
@@ -10,6 +10,8 @@
 #include <wrapper/uaccess.h>
 #include <lttng/probe-user.h>
 
+#define LTTNG_MAX_USER_STRING_LEN 1048576 /* 1MB */
+
 /*
  * Calculate string length. Include final null terminating character if there is
  * one, or ends at first fault. Disabling page faults ensures that we can safely
@@ -19,13 +21,10 @@
 long lttng_strlen_user_inatomic(const char *addr)
 {
        long count = 0;
-       mm_segment_t old_fs;
 
        if (!addr)
                return 0;
 
-       old_fs = get_fs();
-       set_fs(KERNEL_DS);
        pagefault_disable();
        for (;;) {
                char v;
@@ -41,12 +40,13 @@ long lttng_strlen_user_inatomic(const char *addr)
                if (unlikely(ret > 0))
                        break;
                count++;
+               if (unlikely(count > LTTNG_MAX_USER_STRING_LEN))
+                       break;
                if (unlikely(!v))
                        break;
                addr++;
        }
        pagefault_enable();
-       set_fs(old_fs);
        return count;
 }
 EXPORT_SYMBOL_GPL(lttng_strlen_user_inatomic);