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fix: don't allow userspace copy to read kernel memory
[lttng-modules.git]
/
probes
/
lttng-probe-user.c
diff --git
a/probes/lttng-probe-user.c
b/probes/lttng-probe-user.c
index ed566ddb424b123a02f8ec1ba496517801a7eb2d..8de5ed5047890e46d00efcace02f3fe0c527eace 100644
(file)
--- a/
probes/lttng-probe-user.c
+++ b/
probes/lttng-probe-user.c
@@
-32,13
+32,10
@@
long lttng_strlen_user_inatomic(const char *addr)
{
long count = 0;
long lttng_strlen_user_inatomic(const char *addr)
{
long count = 0;
- mm_segment_t old_fs;
if (!addr)
return 0;
if (!addr)
return 0;
- old_fs = get_fs();
- set_fs(KERNEL_DS);
pagefault_disable();
for (;;) {
char v;
pagefault_disable();
for (;;) {
char v;
@@
-59,7
+56,6
@@
long lttng_strlen_user_inatomic(const char *addr)
addr++;
}
pagefault_enable();
addr++;
}
pagefault_enable();
- set_fs(old_fs);
return count;
}
EXPORT_SYMBOL_GPL(lttng_strlen_user_inatomic);
return count;
}
EXPORT_SYMBOL_GPL(lttng_strlen_user_inatomic);
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