[PATCH] x86, syscalls: use SYSCALL_DEFINE() macros for sys_modify_ldt()

From: Dave Hansen
Date: Tue Oct 17 2017 - 15:22:49 EST



We do not have tracepoints for sys_modify_ldt() because we define
it directly instead of using the normal SYSCALL_DEFINEx() macros.

However, there is a reason sys_modify_ldt() does not use the macros:
it has an 'int' return type instead of 'unsigned long'. This is
a bug, but it's a bug cemented in the ABI.

What does this mean? If we return -EINVAL from a function that
returns 'int', we have 0x00000000ffffffea in %rax. But, if we
return -EINVAL from a function returning 'unsigned long', we end
up with 0xffffffffffffffea in %rax, which is wrong.

To work around this and maintain the 'int' behavior while using
the SYSCALL_DEFINEx() macros, so we add a cast to 'unsigned int'
in both implementations of sys_modify_ldt().

Cc: x86@xxxxxxxxxx
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>

---

b/arch/x86/include/asm/syscalls.h | 2 +-
b/arch/x86/kernel/ldt.c | 16 +++++++++++++---
b/arch/x86/um/ldt.c | 6 ++++--
3 files changed, 18 insertions(+), 6 deletions(-)

diff -puN arch/x86/include/asm/syscalls.h~x86-syscall-macros-modify_ldt arch/x86/include/asm/syscalls.h
--- a/arch/x86/include/asm/syscalls.h~x86-syscall-macros-modify_ldt 2017-10-17 10:30:53.032718307 -0700
+++ b/arch/x86/include/asm/syscalls.h 2017-10-17 10:30:53.039718307 -0700
@@ -21,7 +21,7 @@ asmlinkage long sys_ioperm(unsigned long
asmlinkage long sys_iopl(unsigned int);

/* kernel/ldt.c */
-asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);
+asmlinkage long sys_modify_ldt(int, void __user *, unsigned long);

/* kernel/signal.c */
asmlinkage long sys_rt_sigreturn(void);
diff -puN arch/x86/kernel/ldt.c~x86-syscall-macros-modify_ldt arch/x86/kernel/ldt.c
--- a/arch/x86/kernel/ldt.c~x86-syscall-macros-modify_ldt 2017-10-17 10:30:53.034718307 -0700
+++ b/arch/x86/kernel/ldt.c 2017-10-17 12:02:51.137704545 -0700
@@ -12,6 +12,7 @@
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/smp.h>
+#include <linux/syscalls.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
@@ -294,8 +295,8 @@ out:
return error;
}

-asmlinkage int sys_modify_ldt(int func, void __user *ptr,
- unsigned long bytecount)
+SYSCALL_DEFINE3(modify_ldt, int , func , void __user * , ptr ,
+ unsigned long , bytecount)
{
int ret = -ENOSYS;

@@ -313,5 +314,14 @@ asmlinkage int sys_modify_ldt(int func,
ret = write_ldt(ptr, bytecount, 0);
break;
}
- return ret;
+ /*
+ * The SYSCALL_DEFINE() macros give us an 'unsigned long'
+ * return type, but tht ABI for sys_modify_ldt() expects
+ * 'int'. This cast gives us an int-sized value in %rax
+ * for the return code. The 'unsigned' is necessary so
+ * the compiler does not try to sign-extend the negative
+ * return codes into the high half of the register when
+ * taking the value from int->long.
+ */
+ return (unsigned int)ret;
}
diff -puN arch/x86/um/ldt.c~x86-syscall-macros-modify_ldt arch/x86/um/ldt.c
--- a/arch/x86/um/ldt.c~x86-syscall-macros-modify_ldt 2017-10-17 10:30:53.036718307 -0700
+++ b/arch/x86/um/ldt.c 2017-10-17 10:58:58.711714103 -0700
@@ -369,7 +369,9 @@ void free_ldt(struct mm_context *mm)
mm->arch.ldt.entry_count = 0;
}

-int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
+SYSCALL_DEFINE3(modify_ldt, int , func , void __user * , ptr ,
+ unsigned long , bytecount)
{
- return do_modify_ldt_skas(func, ptr, bytecount);
+ /* See non-um modify_ldt() for why we do this cast */
+ return (unsigned int)do_modify_ldt_skas(func, ptr, bytecount);
}
_