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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-08 21:23:00 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-08 21:23:00 +0200 |
| commit | 223cea6a4f0552b86fb25e3b8bbd00469816cd7a (patch) | |
| tree | b1470f93d7b9b996634f1be7fbee2d924aba6f0d /arch/x86/kernel | |
| parent | Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/ker... (diff) | |
| parent | x86/tls: Fix possible spectre-v1 in do_get_thread_area() (diff) | |
| download | linux-223cea6a4f0552b86fb25e3b8bbd00469816cd7a.tar.xz linux-223cea6a4f0552b86fb25e3b8bbd00469816cd7a.zip | |
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 pti updates from Thomas Gleixner:
"The speculative paranoia departement delivers a few more plugs for
possible (probably theoretical) spectre/mds leaks"
* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/tls: Fix possible spectre-v1 in do_get_thread_area()
x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()
x86/speculation/mds: Eliminate leaks by trace_hardirqs_on()
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/ptrace.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/tls.c | 9 |
2 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index 53f34121fdca..ee9099061d01 100644 --- a/arch/x86/kernel/ptrace.c +++ b/arch/x86/kernel/ptrace.c @@ -25,6 +25,7 @@ #include <linux/rcupdate.h> #include <linux/export.h> #include <linux/context_tracking.h> +#include <linux/nospec.h> #include <linux/uaccess.h> #include <asm/pgtable.h> @@ -635,7 +636,8 @@ static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) unsigned long val = 0; if (n < HBP_NUM) { - struct perf_event *bp = thread->ptrace_bps[n]; + int index = array_index_nospec(n, HBP_NUM); + struct perf_event *bp = thread->ptrace_bps[index]; if (bp) val = bp->hw.info.address; diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c index a5b802a12212..71d3fef1edc9 100644 --- a/arch/x86/kernel/tls.c +++ b/arch/x86/kernel/tls.c @@ -5,6 +5,7 @@ #include <linux/user.h> #include <linux/regset.h> #include <linux/syscalls.h> +#include <linux/nospec.h> #include <linux/uaccess.h> #include <asm/desc.h> @@ -220,6 +221,7 @@ int do_get_thread_area(struct task_struct *p, int idx, struct user_desc __user *u_info) { struct user_desc info; + int index; if (idx == -1 && get_user(idx, &u_info->entry_number)) return -EFAULT; @@ -227,8 +229,11 @@ int do_get_thread_area(struct task_struct *p, int idx, if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) return -EINVAL; - fill_user_desc(&info, idx, - &p->thread.tls_array[idx - GDT_ENTRY_TLS_MIN]); + index = idx - GDT_ENTRY_TLS_MIN; + index = array_index_nospec(index, + GDT_ENTRY_TLS_MAX - GDT_ENTRY_TLS_MIN + 1); + + fill_user_desc(&info, idx, &p->thread.tls_array[index]); if (copy_to_user(u_info, &info, sizeof(info))) return -EFAULT; |