projects / pve-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 59d5af67 | 1 | From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 |
| 321d628a FG |
2 | From: Thomas Gleixner <tglx@linutronix.de> |
| 3 | Date: Mon, 4 Dec 2017 15:07:43 +0100 | |
| 59d5af67 | 4 | Subject: [PATCH] x86/mm/pti: Force entry through trampoline when PTI active |
| 321d628a FG |
5 | MIME-Version: 1.0 |
| 6 | Content-Type: text/plain; charset=UTF-8 | |
| 7 | Content-Transfer-Encoding: 8bit | |
| 8 | ||
| 9 | CVE-2017-5754 | |
| 10 | ||
| 11 | Force the entry through the trampoline only when PTI is active. Otherwise | |
| 12 | go through the normal entry code. | |
| 13 | ||
| 14 | Signed-off-by: Thomas Gleixner <tglx@linutronix.de> | |
| 15 | Reviewed-by: Borislav Petkov <bp@suse.de> | |
| 16 | Cc: Andy Lutomirski <luto@kernel.org> | |
| 17 | Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> | |
| 18 | Cc: Borislav Petkov <bp@alien8.de> | |
| 19 | Cc: Brian Gerst <brgerst@gmail.com> | |
| 20 | Cc: Dave Hansen <dave.hansen@linux.intel.com> | |
| 21 | Cc: David Laight <David.Laight@aculab.com> | |
| 22 | Cc: Denys Vlasenko <dvlasenk@redhat.com> | |
| 23 | Cc: Eduardo Valentin <eduval@amazon.com> | |
| 24 | Cc: Greg KH <gregkh@linuxfoundation.org> | |
| 25 | Cc: H. Peter Anvin <hpa@zytor.com> | |
| 26 | Cc: Josh Poimboeuf <jpoimboe@redhat.com> | |
| 27 | Cc: Juergen Gross <jgross@suse.com> | |
| 28 | Cc: Linus Torvalds <torvalds@linux-foundation.org> | |
| 29 | Cc: Peter Zijlstra <peterz@infradead.org> | |
| 30 | Cc: Will Deacon <will.deacon@arm.com> | |
| 31 | Cc: aliguori@amazon.com | |
| 32 | Cc: daniel.gruss@iaik.tugraz.at | |
| 33 | Cc: hughd@google.com | |
| 34 | Cc: keescook@google.com | |
| 35 | Signed-off-by: Ingo Molnar <mingo@kernel.org> | |
| 36 | (cherry picked from commit 8d4b067895791ab9fdb1aadfc505f64d71239dd2) | |
| 37 | Signed-off-by: Andy Whitcroft <apw@canonical.com> | |
| 38 | Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com> | |
| 39 | (cherry picked from commit 9ae1ea4821648be179a96fe65b3ed4bd111a5c98) | |
| 40 | Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> | |
| 41 | --- | |
| 42 | arch/x86/kernel/cpu/common.c | 5 ++++- | |
| 43 | 1 file changed, 4 insertions(+), 1 deletion(-) | |
| 44 | ||
| 45 | diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c | |
| 46 | index 623ba3635793..99f37d1636ff 100644 | |
| 47 | --- a/arch/x86/kernel/cpu/common.c | |
| 48 | +++ b/arch/x86/kernel/cpu/common.c | |
| 49 | @@ -1340,7 +1340,10 @@ void syscall_init(void) | |
| 50 | (entry_SYSCALL_64_trampoline - _entry_trampoline); | |
| 51 | ||
| 52 | wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS); | |
| 53 | - wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline); | |
| 54 | + if (static_cpu_has(X86_FEATURE_PTI)) | |
| 55 | + wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline); | |
| 56 | + else | |
| 57 | + wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64); | |
| 58 | ||
| 59 | #ifdef CONFIG_IA32_EMULATION | |
| 60 | wrmsrl(MSR_CSTAR, (unsigned long)entry_SYSCALL_compat); | |
| 61 | -- | |
| 62 | 2.14.2 | |
| 63 |