[arch-commits] Commit in linux-hardened/trunk (3 files)

Levente Polyak anthraxx at archlinux.org
Fri May 22 16:16:26 UTC 2020


    Date: Friday, May 22, 2020 @ 16:16:26
  Author: anthraxx
Revision: 387431

upgpkg: linux-hardened 5.6.14.a-1

Modified:
  linux-hardened/trunk/PKGBUILD
Deleted:
  linux-hardened/trunk/0003-Makefile-disallow-data-races-on-gcc-10-as-well.patch
  linux-hardened/trunk/0004-x86-Fix-early-boot-crash-on-gcc-10-next-try.patch

-----------------------------------------------------------+
 0003-Makefile-disallow-data-races-on-gcc-10-as-well.patch |   32 --
 0004-x86-Fix-early-boot-crash-on-gcc-10-next-try.patch    |  131 ------------
 PKGBUILD                                                  |   10 
 3 files changed, 3 insertions(+), 170 deletions(-)

Deleted: 0003-Makefile-disallow-data-races-on-gcc-10-as-well.patch
===================================================================
--- 0003-Makefile-disallow-data-races-on-gcc-10-as-well.patch	2020-05-22 14:38:41 UTC (rev 387430)
+++ 0003-Makefile-disallow-data-races-on-gcc-10-as-well.patch	2020-05-22 16:16:26 UTC (rev 387431)
@@ -1,32 +0,0 @@
-From af805f5f1d2e61dd2cf907d9635f0abc66fe1197 Mon Sep 17 00:00:00 2001
-From: Sergei Trofimovich <slyfox at gentoo.org>
-Date: Tue, 17 Mar 2020 00:07:18 +0000
-Subject: [PATCH 3/4] Makefile: disallow data races on gcc-10 as well
-
-gcc-10 will rename --param=allow-store-data-races=0
-to -fno-allow-store-data-races.
-
-The flag change happened at https://gcc.gnu.org/PR92046.
-
-Signed-off-by: Sergei Trofimovich <slyfox at gentoo.org>
-Acked-by: Jiri Kosina <jkosina at suse.cz>
-Signed-off-by: Masahiro Yamada <masahiroy at kernel.org>
----
- Makefile | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/Makefile b/Makefile
-index 5dedd6f9ad75..6899bfc9dc7b 100644
---- a/Makefile
-+++ b/Makefile
-@@ -714,6 +714,7 @@ endif
- 
- # Tell gcc to never replace conditional load with a non-conditional one
- KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
-+KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
- 
- include scripts/Makefile.kcov
- include scripts/Makefile.gcc-plugins
--- 
-2.26.2
-

Deleted: 0004-x86-Fix-early-boot-crash-on-gcc-10-next-try.patch
===================================================================
--- 0004-x86-Fix-early-boot-crash-on-gcc-10-next-try.patch	2020-05-22 14:38:41 UTC (rev 387430)
+++ 0004-x86-Fix-early-boot-crash-on-gcc-10-next-try.patch	2020-05-22 16:16:26 UTC (rev 387431)
@@ -1,131 +0,0 @@
-From 309b6eca2e2605accf7a3b02b47b5c2732dbe543 Mon Sep 17 00:00:00 2001
-From: Borislav Petkov <bp at suse.de>
-Date: Wed, 22 Apr 2020 18:11:30 +0200
-Subject: [PATCH 4/4] x86: Fix early boot crash on gcc-10, next try
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-... or the odyssey of trying to disable the stack protector for the
-function which generates the stack canary value.
-
-The whole story started with Sergei reporting a boot crash with a kernel
-built with gcc-10:
-
-  Kernel panic — not syncing: stack-protector: Kernel stack is corrupted in: start_secondary
-  CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc5—00235—gfffb08b37df9 #139
-  Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./H77M—D3H, BIOS F12 11/14/2013
-  Call Trace:
-    dump_stack
-    panic
-    ? start_secondary
-    __stack_chk_fail
-    start_secondary
-    secondary_startup_64
-  -—-[ end Kernel panic — not syncing: stack—protector: Kernel stack is corrupted in: start_secondary
-
-This happens because gcc-10 tail-call optimizes the last function call
-in start_secondary() - cpu_startup_entry() - and thus emits a stack
-canary check which fails because the canary value changes after the
-boot_init_stack_canary() call.
-
-To fix that, the initial attempt was to mark the one function which
-generates the stack canary with:
-
-  __attribute__((optimize("-fno-stack-protector"))) ... start_secondary(void *unused)
-
-however, using the optimize attribute doesn't work cumulatively
-as the attribute does not add to but rather replaces previously
-supplied optimization options - roughly all -fxxx options.
-
-The key one among them being -fno-omit-frame-pointer and thus leading to
-not present frame pointer - frame pointer which the kernel needs.
-
-The next attempt to prevent compilers from tail-call optimizing
-the last function call cpu_startup_entry(), shy of carving out
-start_secondary() into a separate compilation unit and building it with
--fno-stack-protector, is this one.
-
-The current solution is short and sweet, and reportedly, is supported by
-both compilers so let's see how far we'll get this time.
-
-Reported-by: Sergei Trofimovich <slyfox at gentoo.org>
-Signed-off-by: Borislav Petkov <bp at suse.de>
-Reviewed-by: Nick Desaulniers <ndesaulniers at google.com>
-Reviewed-by: Kees Cook <keescook at chromium.org>
-Link: https://lkml.kernel.org/r/20200314164451.346497-1-slyfox@gentoo.org
----
- arch/x86/include/asm/stackprotector.h | 7 ++++++-
- arch/x86/kernel/smpboot.c             | 8 ++++++++
- arch/x86/xen/smp_pv.c                 | 1 +
- include/linux/compiler.h              | 6 ++++++
- 4 files changed, 21 insertions(+), 1 deletion(-)
-
-diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
-index 91e29b6a86a5..9804a7957f4e 100644
---- a/arch/x86/include/asm/stackprotector.h
-+++ b/arch/x86/include/asm/stackprotector.h
-@@ -55,8 +55,13 @@
- /*
-  * Initialize the stackprotector canary value.
-  *
-- * NOTE: this must only be called from functions that never return,
-+ * NOTE: this must only be called from functions that never return
-  * and it must always be inlined.
-+ *
-+ * In addition, it should be called from a compilation unit for which
-+ * stack protector is disabled. Alternatively, the caller should not end
-+ * with a function call which gets tail-call optimized as that would
-+ * lead to checking a modified canary value.
-  */
- static __always_inline void boot_init_stack_canary(void)
- {
-diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
-index 69881b2d446c..9674321ce3a3 100644
---- a/arch/x86/kernel/smpboot.c
-+++ b/arch/x86/kernel/smpboot.c
-@@ -262,6 +262,14 @@ static void notrace start_secondary(void *unused)
- 
- 	wmb();
- 	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
-+
-+	/*
-+	 * Prevent tail call to cpu_startup_entry() because the stack protector
-+	 * guard has been changed a couple of function calls up, in
-+	 * boot_init_stack_canary() and must not be checked before tail calling
-+	 * another function.
-+	 */
-+	prevent_tail_call_optimization();
- }
- 
- /**
-diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
-index 802ee5bba66c..0cebe5db691d 100644
---- a/arch/x86/xen/smp_pv.c
-+++ b/arch/x86/xen/smp_pv.c
-@@ -92,6 +92,7 @@ asmlinkage __visible void cpu_bringup_and_idle(void)
- 	cpu_bringup();
- 	boot_init_stack_canary();
- 	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
-+	prevent_tail_call_optimization();
- }
- 
- void xen_smp_intr_free_pv(unsigned int cpu)
-diff --git a/include/linux/compiler.h b/include/linux/compiler.h
-index 034b0a644efc..732754d96039 100644
---- a/include/linux/compiler.h
-+++ b/include/linux/compiler.h
-@@ -356,4 +356,10 @@ static inline void *offset_to_ptr(const int *off)
- /* &a[0] degrades to a pointer: a different type from an array */
- #define __must_be_array(a)	BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
- 
-+/*
-+ * This is needed in functions which generate the stack canary, see
-+ * arch/x86/kernel/smpboot.c::start_secondary() for an example.
-+ */
-+#define prevent_tail_call_optimization()	asm("")
-+
- #endif /* __LINUX_COMPILER_H */
--- 
-2.26.2
-

Modified: PKGBUILD
===================================================================
--- PKGBUILD	2020-05-22 14:38:41 UTC (rev 387430)
+++ PKGBUILD	2020-05-22 16:16:26 UTC (rev 387431)
@@ -4,7 +4,7 @@
 # Contributor: Thomas Baechler <thomas at archlinux.org>
 
 pkgbase=linux-hardened
-pkgver=5.6.13.a
+pkgver=5.6.14.a
 pkgrel=1
 pkgdesc='Security-Hardened Linux'
 url='https://github.com/anthraxx/linux-hardened'
@@ -22,8 +22,6 @@
   config         # the main kernel config file
   0001-gcc-plugins-drop-support-for-GCC-4.7.patch
   0002-gcc-common.h-Update-for-GCC-10.patch
-  0003-Makefile-disallow-data-races-on-gcc-10-as-well.patch
-  0004-x86-Fix-early-boot-crash-on-gcc-10-next-try.patch
   sphinx-workaround.patch
 )
 validpgpkeys=(
@@ -32,15 +30,13 @@
   '65EEFE022108E2B708CBFCF7F9E712E59AF5F22A'  # Daniel Micay
   'E240B57E2C4630BA768E2F26FC1B547C8D8172C8'  # Levente Polyak
 )
-sha256sums=('f125d79c8f6974213638787adcad6b575bbd35a05851802fd83f622ec18ff987'
+sha256sums=('33763f3541711e39fa743da45ff9512d54ade61406173f3d267ba4484cec7ea3'
             'SKIP'
-            '25e668a838dfcc710114f6e764d89d4bd55d4446dd3e85559c525d0e60092efc'
+            '84ec49efc9243c3a04d10c30b487137c39611f32e7046938affc09a53585d4c2'
             'SKIP'
             '93ba919836378a3a4df05e78011281a6e4430afe89a0e54dac48e2ad15355fa4'
             '118531186e7069b006d48fdfb2dbd9f28ee6d01cbfaacb007d8f44e8e76a57e1'
             'd2ee933dd10dee475746a7e9081bca3ebdae8c6fb631f458d8f0d4987c9a0845'
-            'b604f4041c94d12abc0a0ad9e15ab54a7712c424d7740d6dffff8e0a001ae862'
-            '09dbf84dff332fd9c2cde9eca97ce70e73ff7b90c08f22b169c6b69a633c56b0'
             '8cb21e0b3411327b627a9dd15b8eb773295a0d2782b1a41b2a8839d1b2f5778c')
 
 export KBUILD_BUILD_HOST=archlinux


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