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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-12-31 16:52:15 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-12-31 16:55:09 +0100 |
| commit | 7f414195b0c3612acd12b4611a5fe75995cf10c7 (patch) | |
| tree | 0fb83d6e1283ec3e3963e14d34573c22e474bbdd | |
| parent | a62d69857aab4caa43049e72fe0ed5c4a60518dd (diff) | |
| download | linux-7f414195b0c3612acd12b4611a5fe75995cf10c7.tar.gz linux-7f414195b0c3612acd12b4611a5fe75995cf10c7.tar.bz2 linux-7f414195b0c3612acd12b4611a5fe75995cf10c7.zip | |
x86/ldt: Make LDT pgtable free conditional
Andy prefers to be paranoid about the pagetable free in the error path of
write_ldt(). Make it conditional and warn whenever the installment of a
secondary LDT fails.
Requested-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/ldt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c index 500e90e44f86..26d713ecad34 100644 --- a/arch/x86/kernel/ldt.c +++ b/arch/x86/kernel/ldt.c @@ -426,7 +426,8 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode) * already installed then the PTE page is already * populated. Mop up a half populated page table. */ - free_ldt_pgtables(mm); + if (!WARN_ON_ONCE(old_ldt)) + free_ldt_pgtables(mm); free_ldt_struct(new_ldt); goto out_unlock; } |