Commit 37e81a01 authored Jun 29, 2015 by Hans-Werner Hilse Committed by Richard Weinberger Oct 19, 2015

um: Do not rely on libc to provide modify_ldt()



modify_ldt() was declared as an external symbol. Despite the man
page for this syscall telling that there is no wrapper in glibc,
since version 2.1 there actually is, so linking to the glibc
works.

Since modify_ldt() is not a POSIX interface, other libc
implementations do not always provide a wrapper function.
Even glibc headers do not provide a corresponding declaration.

So go the recommended way to call this using syscall().

Signed-off-by: Hans-Werner Hilse <hwhilse@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

parent 0b5aedfe

arch/x86/um/ldt.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -12,7 +12,10 @@
		#include <skas.h>
		#include <sysdep/tls.h>

		extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
		static inline int modify_ldt (int func, void *ptr, unsigned long bytecount)
		{
		return syscall(__NR_modify_ldt, func, ptr, bytecount);
		}

		static long write_ldt_entry(struct mm_id *mm_idp, int func,
		struct user_desc desc, void *addr, int done)

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