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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fix from Ingo Molnar:
 "This contains a single TLS ABI validation fix from Andy Lutomirski"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/tls: Don't validate lm in set_thread_area() after all
This commit is contained in:
Linus Torvalds 2014-12-19 13:18:31 -08:00
parent 88a57667f2 3fb2f4237b
commit 1092b596a5
2 changed files with 7 additions and 6 deletions
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7
arch/x86/include/uapi/asm/ldt.h
View File

@ -28,6 +28,13 @@ struct user_desc {
unsigned int seg_not_present:1;
unsigned int useable:1;
#ifdef __x86_64__
/*
* Because this bit is not present in 32-bit user code, user
* programs can pass uninitialized values here. Therefore, in
* any context in which a user_desc comes from a 32-bit program,
* the kernel must act as though lm == 0, regardless of the
* actual value.
*/
unsigned int lm:1;
#endif
};

6
arch/x86/kernel/tls.c
View File

@ -55,12 +55,6 @@ static bool tls_desc_okay(const struct user_desc *info)
if (info->seg_not_present)
return false;
#ifdef CONFIG_X86_64
/* The L bit makes no sense for data. */
if (info->lm)
return false;
#endif
return true;
}