anthraxx · 0xsirus · May 27, 2017 · May 29, 2017 · Apr 26, 2018 · May 3, 2017
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
@@ -503,16 +503,6 @@
 			nosocket -- Disable socket memory accounting.
 			nokmem -- Disable kernel memory accounting.
 
-	checkreqprot	[SELINUX] Set initial checkreqprot flag value.
-			Format: { "0" | "1" }
-			See security/selinux/Kconfig help text.
-			0 -- check protection applied by kernel (includes
-				any implied execute protection).
-			1 -- check protection requested by application.
-			Default value is set via a kernel config option.
-			Value can be changed at runtime via
-				/sys/fs/selinux/checkreqprot.
-
 	cio_ignore=	[S390]
 			See Documentation/s390/common_io.rst for details.
 	clk_ignore_unused
@@ -3399,6 +3389,11 @@
 			the specified number of seconds.  This is to be used if
 			your oopses keep scrolling off the screen.
 
+	extra_latent_entropy
+			Enable a very simple form of latent entropy extraction
+			from the first 4GB of memory as the bootmem allocator
+			passes the memory pages to the buddy allocator.
+
 	pcbit=		[HW,ISDN]
 
 	pcd.		[PARIDE]

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
@@ -102,6 +102,7 @@ show up in /proc/sys/kernel:
 - sysctl_writes_strict
 - tainted                     ==> Documentation/admin-guide/tainted-kernels.rst
 - threads-max
+- tiocsti_restrict
 - unknown_nmi_panic
 - watchdog
 - watchdog_thresh
@@ -1112,6 +1113,25 @@ If a value outside of this range is written to threads-max an error
 EINVAL occurs.
 
 
+tiocsti_restrict:
+=================
+
+This toggle indicates whether unprivileged users are prevented from using the
+TIOCSTI ioctl to inject commands into other processes which share a tty
+session.
+
+When tiocsti_restrict is set to (0) there are no restrictions(accept the
+default restriction of only being able to injection commands into one's own
+tty). When tiocsti_restrict is set to (1), users must have CAP_SYS_ADMIN to
+use the TIOCSTI ioctl.
+
+When user namespaces are in use, the check for the capability CAP_SYS_ADMIN is
+done against the user namespace that originally opened the tty.
+
+The kernel config option CONFIG_SECURITY_TIOCSTI_RESTRICT sets the default
+value of tiocsti_restrict.
+
+
 unknown_nmi_panic:
 ==================
 

diff --git a/arch/Kconfig b/arch/Kconfig
@@ -658,7 +658,7 @@ config ARCH_MMAP_RND_BITS
 	int "Number of bits to use for ASLR of mmap base address" if EXPERT
 	range ARCH_MMAP_RND_BITS_MIN ARCH_MMAP_RND_BITS_MAX
 	default ARCH_MMAP_RND_BITS_DEFAULT if ARCH_MMAP_RND_BITS_DEFAULT
-	default ARCH_MMAP_RND_BITS_MIN
+	default ARCH_MMAP_RND_BITS_MAX
 	depends on HAVE_ARCH_MMAP_RND_BITS
 	help
 	  This value can be used to select the number of bits to use to
@@ -692,7 +692,7 @@ config ARCH_MMAP_RND_COMPAT_BITS
 	int "Number of bits to use for ASLR of mmap base address for compatible applications" if EXPERT
 	range ARCH_MMAP_RND_COMPAT_BITS_MIN ARCH_MMAP_RND_COMPAT_BITS_MAX
 	default ARCH_MMAP_RND_COMPAT_BITS_DEFAULT if ARCH_MMAP_RND_COMPAT_BITS_DEFAULT
-	default ARCH_MMAP_RND_COMPAT_BITS_MIN
+	default ARCH_MMAP_RND_COMPAT_BITS_MAX
 	depends on HAVE_ARCH_MMAP_RND_COMPAT_BITS
 	help
 	  This value can be used to select the number of bits to use to

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
@@ -1212,6 +1212,7 @@ config RODATA_FULL_DEFAULT_ENABLED
 
 config ARM64_SW_TTBR0_PAN
 	bool "Emulate Privileged Access Never using TTBR0_EL1 switching"
+	default y
 	help
 	  Enabling this option prevents the kernel from accessing
 	  user-space memory directly by pointing TTBR0_EL1 to a reserved
@@ -1640,6 +1641,7 @@ config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image"
 	select ARM64_MODULE_PLTS if MODULES
 	select RELOCATABLE
+	default y
 	help
 	  Randomizes the virtual address at which the kernel image is
 	  loaded, as a security feature that deters exploit attempts

diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
@@ -26,6 +26,7 @@ config ARM64_RANDOMIZE_TEXT_OFFSET
 config DEBUG_WX
 	bool "Warn on W+X mappings at boot"
 	select PTDUMP_CORE
+	default y
 	---help---
 	  Generate a warning if any W+X mappings are found at boot.
 

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
@@ -1,4 +1,3 @@
-CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
 CONFIG_AUDIT=y
 CONFIG_NO_HZ_IDLE=y

diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
@@ -103,14 +103,10 @@
 
 /*
  * This is the base location for PIE (ET_DYN with INTERP) loads. On
- * 64-bit, this is above 4GB to leave the entire 32-bit address
+ * 64-bit, this is raised to 4GB to leave the entire 32-bit address
  * space open for things that want to use the area for 32-bit pointers.
  */
-#ifdef CONFIG_ARM64_FORCE_52BIT
-#define ELF_ET_DYN_BASE		(2 * TASK_SIZE_64 / 3)
-#else
-#define ELF_ET_DYN_BASE		(2 * DEFAULT_MAP_WINDOW_64 / 3)
-#endif /* CONFIG_ARM64_FORCE_52BIT */
+#define ELF_ET_DYN_BASE		0x100000000UL
 
 #ifndef __ASSEMBLY__
 
@@ -164,10 +160,10 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 /* 1GB of VA */
 #ifdef CONFIG_COMPAT
 #define STACK_RND_MASK			(test_thread_flag(TIF_32BIT) ? \
-						0x7ff >> (PAGE_SHIFT - 12) : \
-						0x3ffff >> (PAGE_SHIFT - 12))
+						((1UL << mmap_rnd_compat_bits) - 1) >> (PAGE_SHIFT - 12) : \
+						((1UL << mmap_rnd_bits) - 1) >> (PAGE_SHIFT - 12))
 #else
-#define STACK_RND_MASK			(0x3ffff >> (PAGE_SHIFT - 12))
+#define STACK_RND_MASK			(((1UL << mmap_rnd_bits) - 1) >> (PAGE_SHIFT - 12))
 #endif
 
 #ifdef __AARCH64EB__

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
@@ -1193,8 +1193,7 @@ config VM86
 	default X86_LEGACY_VM86
 
 config X86_16BIT
-	bool "Enable support for 16-bit segments" if EXPERT
-	default y
+	bool "Enable support for 16-bit segments"
 	depends on MODIFY_LDT_SYSCALL
 	---help---
 	  This option is required by programs like Wine to run 16-bit
@@ -2331,7 +2330,7 @@ config COMPAT_VDSO
 choice
 	prompt "vsyscall table for legacy applications"
 	depends on X86_64
-	default LEGACY_VSYSCALL_XONLY
+	default LEGACY_VSYSCALL_NONE
 	help
 	  Legacy user code that does not know how to find the vDSO expects
 	  to be able to issue three syscalls by calling fixed addresses in
@@ -2427,8 +2426,7 @@ config CMDLINE_OVERRIDE
 	  be set to 'N' under normal conditions.
 
 config MODIFY_LDT_SYSCALL
-	bool "Enable the LDT (local descriptor table)" if EXPERT
-	default y
+	bool "Enable the LDT (local descriptor table)"
 	---help---
 	  Linux can allow user programs to install a per-process x86
 	  Local Descriptor Table (LDT) using the modify_ldt(2) system

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
@@ -75,6 +75,7 @@ config EFI_PGT_DUMP
 config DEBUG_WX
 	bool "Warn on W+X mappings at boot"
 	select PTDUMP_CORE
+	default y
 	---help---
 	  Generate a warning if any W+X mappings are found at boot.
 

diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
@@ -1,5 +1,4 @@
 # CONFIG_LOCALVERSION_AUTO is not set
-CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
 CONFIG_BSD_PROCESS_ACCT=y
 CONFIG_TASKSTATS=y

diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
@@ -314,55 +314,9 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr)
 }
 
 #ifdef CONFIG_X86_64
-/*
- * Put the vdso above the (randomized) stack with another randomized
- * offset.  This way there is no hole in the middle of address space.
- * To save memory make sure it is still in the same PTE as the stack
- * top.  This doesn't give that many random bits.
- *
- * Note that this algorithm is imperfect: the distribution of the vdso
- * start address within a PMD is biased toward the end.
- *
- * Only used for the 64-bit and x32 vdsos.
- */
-static unsigned long vdso_addr(unsigned long start, unsigned len)
-{
-	unsigned long addr, end;
-	unsigned offset;
-
-	/*
-	 * Round up the start address.  It can start out unaligned as a result
-	 * of stack start randomization.
-	 */
-	start = PAGE_ALIGN(start);
-
-	/* Round the lowest possible end address up to a PMD boundary. */
-	end = (start + len + PMD_SIZE - 1) & PMD_MASK;
-	if (end >= TASK_SIZE_MAX)
-		end = TASK_SIZE_MAX;
-	end -= len;
-
-	if (end > start) {
-		offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
-		addr = start + (offset << PAGE_SHIFT);
-	} else {
-		addr = start;
-	}
-
-	/*
-	 * Forcibly align the final address in case we have a hardware
-	 * issue that requires alignment for performance reasons.
-	 */
-	addr = align_vdso_addr(addr);
-
-	return addr;
-}
-
 static int map_vdso_randomized(const struct vdso_image *image)
 {
-	unsigned long addr = vdso_addr(current->mm->start_stack, image->size-image->sym_vvar_start);
-
-	return map_vdso(image, addr);
+	return map_vdso(image, 0);
 }
 #endif
 

diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
@@ -248,11 +248,11 @@ extern int force_personality32;
 
 /*
  * This is the base location for PIE (ET_DYN with INTERP) loads. On
- * 64-bit, this is above 4GB to leave the entire 32-bit address
+ * 64-bit, this is raised to 4GB to leave the entire 32-bit address
  * space open for things that want to use the area for 32-bit pointers.
  */
 #define ELF_ET_DYN_BASE		(mmap_is_ia32() ? 0x000400000UL : \
-						  (DEFAULT_MAP_WINDOW / 3 * 2))
+						  0x100000000UL)
 
 /* This yields a mask that user programs can use to figure out what
    instruction set this CPU supports.  This could be done in user space,
@@ -312,8 +312,8 @@ extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len);
 
 #ifdef CONFIG_X86_32
 
-#define __STACK_RND_MASK(is32bit) (0x7ff)
-#define STACK_RND_MASK (0x7ff)
+#define __STACK_RND_MASK(is32bit) ((1UL << mmap_rnd_bits) - 1)
+#define STACK_RND_MASK ((1UL << mmap_rnd_bits) - 1)
 
 #define ARCH_DLINFO		ARCH_DLINFO_IA32
 
@@ -322,7 +322,11 @@ extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len);
 #else /* CONFIG_X86_32 */
 
 /* 1GB for 64bit, 8MB for 32bit */
-#define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff)
+#ifdef CONFIG_COMPAT
+#define __STACK_RND_MASK(is32bit) ((is32bit) ? (1UL << mmap_rnd_compat_bits) - 1 : (1UL << mmap_rnd_bits) - 1)
+#else
+#define __STACK_RND_MASK(is32bit) ((1UL << mmap_rnd_bits) - 1)
+#endif
 #define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32())
 
 #define ARCH_DLINFO							\
@@ -380,5 +384,4 @@ struct va_alignment {
 } ____cacheline_aligned;
 
 extern struct va_alignment va_align;
-extern unsigned long align_vdso_addr(unsigned long);
 #endif /* _ASM_X86_ELF_H */
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
@@ -295,6 +295,7 @@ static inline void cr4_set_bits_irqsoff(unsigned long mask)
 	unsigned long cr4;
 
 	cr4 = this_cpu_read(cpu_tlbstate.cr4);
+	BUG_ON(cr4 != __read_cr4());
 	if ((cr4 | mask) != cr4)
 		__cr4_set(cr4 | mask);
 }
@@ -305,6 +306,7 @@ static inline void cr4_clear_bits_irqsoff(unsigned long mask)
 	unsigned long cr4;
 
 	cr4 = this_cpu_read(cpu_tlbstate.cr4);
+	BUG_ON(cr4 != __read_cr4());
 	if ((cr4 & ~mask) != cr4)
 		__cr4_set(cr4 & ~mask);
 }
@@ -334,6 +336,7 @@ static inline void cr4_toggle_bits_irqsoff(unsigned long mask)
 	unsigned long cr4;
 
 	cr4 = this_cpu_read(cpu_tlbstate.cr4);
+        BUG_ON(cr4 != __read_cr4());
 	__cr4_set(cr4 ^ mask);
 }
 
@@ -440,6 +443,7 @@ static inline void __native_flush_tlb_global(void)
 	raw_local_irq_save(flags);
 
 	cr4 = this_cpu_read(cpu_tlbstate.cr4);
+	BUG_ON(cr4 != __read_cr4());
 	/* toggle PGE */
 	native_write_cr4(cr4 ^ X86_CR4_PGE);
 	/* write old PGE again and flush TLBs */

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
@@ -43,6 +43,8 @@
 #include <asm/spec-ctrl.h>
 #include <asm/io_bitmap.h>
 #include <asm/proto.h>
+#include <asm/elf.h>
+#include <linux/sizes.h>
 
 #include "process.h"
 
@@ -913,7 +915,10 @@ unsigned long arch_align_stack(unsigned long sp)
 
 unsigned long arch_randomize_brk(struct mm_struct *mm)
 {
-	return randomize_page(mm->brk, 0x02000000);
+	if (mmap_is_ia32())
+		return mm->brk + get_random_long() % SZ_32M + PAGE_SIZE;
+	else
+		return mm->brk + get_random_long() % SZ_1G + PAGE_SIZE;
 }
 
 /*

diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
@@ -53,13 +53,6 @@ static unsigned long get_align_bits(void)
 	return va_align.bits & get_align_mask();
 }
 
-unsigned long align_vdso_addr(unsigned long addr)
-{
-	unsigned long align_mask = get_align_mask();
-	addr = (addr + align_mask) & ~align_mask;
-	return addr | get_align_bits();
-}
-
 static int __init control_va_addr_alignment(char *str)
 {
 	/* guard against enabling this on other CPU families */
@@ -121,10 +114,7 @@ static void find_start_end(unsigned long addr, unsigned long flags,
 	}
 
 	*begin	= get_mmap_base(1);
-	if (in_32bit_syscall())
-		*end = task_size_32bit();
-	else
-		*end = task_size_64bit(addr > DEFAULT_MAP_WINDOW);
+	*end	= get_mmap_base(0);
 }
 
 unsigned long
@@ -201,7 +191,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 
 	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 	info.length = len;
-	info.low_limit = PAGE_SIZE;
+	info.low_limit = get_mmap_base(1);
 	info.high_limit = get_mmap_base(0);
 
 	/*

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
@@ -561,9 +561,9 @@ static void __init pagetable_init(void)
 
 #define DEFAULT_PTE_MASK ~(_PAGE_NX | _PAGE_GLOBAL)
 /* Bits supported by the hardware: */
-pteval_t __supported_pte_mask __read_mostly = DEFAULT_PTE_MASK;
+pteval_t __supported_pte_mask __ro_after_init = DEFAULT_PTE_MASK;
 /* Bits allowed in normal kernel mappings: */
-pteval_t __default_kernel_pte_mask __read_mostly = DEFAULT_PTE_MASK;
+pteval_t __default_kernel_pte_mask __ro_after_init = DEFAULT_PTE_MASK;
 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 /* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */
 EXPORT_SYMBOL(__default_kernel_pte_mask);

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
@@ -97,9 +97,9 @@ DEFINE_ENTRY(pte, pte, init)
  */
 
 /* Bits supported by the hardware: */
-pteval_t __supported_pte_mask __read_mostly = ~0;
+pteval_t __supported_pte_mask __ro_after_init = ~0;
 /* Bits allowed in normal kernel mappings: */
-pteval_t __default_kernel_pte_mask __read_mostly = ~0;
+pteval_t __default_kernel_pte_mask __ro_after_init = ~0;
 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 /* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */
 EXPORT_SYMBOL(__default_kernel_pte_mask);