commit: b34b17f4fe52530b679cbb066e4dbff4a9dd160d Author: Mike Pagano <mpagano <AT> gentoo <DOT> org> AuthorDate: Fri Oct 21 11:10:25 2016 +0000 Commit: Mike Pagano <mpagano <AT> gentoo <DOT> org> CommitDate: Fri Oct 21 11:10:25 2016 +0000 URL: https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=b34b17f4
Linux patch 4.4.26 0000_README | 4 ++ 1025_linux-4.4.26.patch | 153 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 157 insertions(+) diff --git a/0000_README b/0000_README index 8be4294..1d64ed0 100644 --- a/0000_README +++ b/0000_README @@ -143,6 +143,10 @@ Patch: 1024_linux-4.4.25.patch From: http://www.kernel.org Desc: Linux 4.4.25 +Patch: 1025_linux-4.4.26.patch +From: http://www.kernel.org +Desc: Linux 4.4.26 + Patch: 1500_XATTR_USER_PREFIX.patch From: https://bugs.gentoo.org/show_bug.cgi?id=470644 Desc: Support for namespace user.pax.* on tmpfs. diff --git a/1025_linux-4.4.26.patch b/1025_linux-4.4.26.patch new file mode 100644 index 0000000..f09375b --- /dev/null +++ b/1025_linux-4.4.26.patch @@ -0,0 +1,153 @@ +diff --git a/Makefile b/Makefile +index 578a82554923..a127b9ef9ebc 100644 +--- a/Makefile ++++ b/Makefile +@@ -1,6 +1,6 @@ + VERSION = 4 + PATCHLEVEL = 4 +-SUBLEVEL = 25 ++SUBLEVEL = 26 + EXTRAVERSION = + NAME = Blurry Fish Butt + +diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile +index 0a291cdfaf77..efa6073ffa7e 100644 +--- a/arch/x86/boot/compressed/Makefile ++++ b/arch/x86/boot/compressed/Makefile +@@ -22,7 +22,7 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ + vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 + + KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 +-KBUILD_CFLAGS += -fno-strict-aliasing -fPIC ++KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) + KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING + cflags-$(CONFIG_X86_32) := -march=i386 + cflags-$(CONFIG_X86_64) := -mcmodel=small +@@ -35,6 +35,18 @@ KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ + GCOV_PROFILE := n + + LDFLAGS := -m elf_$(UTS_MACHINE) ++ifeq ($(CONFIG_RELOCATABLE),y) ++# If kernel is relocatable, build compressed kernel as PIE. ++ifeq ($(CONFIG_X86_32),y) ++LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker) ++else ++# To build 64-bit compressed kernel as PIE, we disable relocation ++# overflow check to avoid relocation overflow error with a new linker ++# command-line option, -z noreloc-overflow. ++LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \ ++ && echo "-z noreloc-overflow -pie --no-dynamic-linker") ++endif ++endif + LDFLAGS_vmlinux := -T + + hostprogs-y := mkpiggy +diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S +index 8ef964ddc18e..0256064da8da 100644 +--- a/arch/x86/boot/compressed/head_32.S ++++ b/arch/x86/boot/compressed/head_32.S +@@ -31,6 +31,34 @@ + #include <asm/asm-offsets.h> + #include <asm/bootparam.h> + ++/* ++ * The 32-bit x86 assembler in binutils 2.26 will generate R_386_GOT32X ++ * relocation to get the symbol address in PIC. When the compressed x86 ++ * kernel isn't built as PIC, the linker optimizes R_386_GOT32X ++ * relocations to their fixed symbol addresses. However, when the ++ * compressed x86 kernel is loaded at a different address, it leads ++ * to the following load failure: ++ * ++ * Failed to allocate space for phdrs ++ * ++ * during the decompression stage. ++ * ++ * If the compressed x86 kernel is relocatable at run-time, it should be ++ * compiled with -fPIE, instead of -fPIC, if possible and should be built as ++ * Position Independent Executable (PIE) so that linker won't optimize ++ * R_386_GOT32X relocation to its fixed symbol address. Older ++ * linkers generate R_386_32 relocations against locally defined symbols, ++ * _bss, _ebss, _got and _egot, in PIE. It isn't wrong, just less ++ * optimal than R_386_RELATIVE. But the x86 kernel fails to properly handle ++ * R_386_32 relocations when relocating the kernel. To generate ++ * R_386_RELATIVE relocations, we mark _bss, _ebss, _got and _egot as ++ * hidden: ++ */ ++ .hidden _bss ++ .hidden _ebss ++ .hidden _got ++ .hidden _egot ++ + __HEAD + ENTRY(startup_32) + #ifdef CONFIG_EFI_STUB +diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S +index b0c0d16ef58d..86558a199139 100644 +--- a/arch/x86/boot/compressed/head_64.S ++++ b/arch/x86/boot/compressed/head_64.S +@@ -33,6 +33,14 @@ + #include <asm/asm-offsets.h> + #include <asm/bootparam.h> + ++/* ++ * Locally defined symbols should be marked hidden: ++ */ ++ .hidden _bss ++ .hidden _ebss ++ .hidden _got ++ .hidden _egot ++ + __HEAD + .code32 + ENTRY(startup_32) +diff --git a/include/linux/mm.h b/include/linux/mm.h +index cfebb742ee18..f0ffa01c90d9 100644 +--- a/include/linux/mm.h ++++ b/include/linux/mm.h +@@ -2112,6 +2112,7 @@ static inline struct page *follow_page(struct vm_area_struct *vma, + #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ + #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ + #define FOLL_MLOCK 0x1000 /* lock present pages */ ++#define FOLL_COW 0x4000 /* internal GUP flag */ + + typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, + void *data); +diff --git a/mm/gup.c b/mm/gup.c +index deafa2c91b36..4b0b7e7d1136 100644 +--- a/mm/gup.c ++++ b/mm/gup.c +@@ -58,6 +58,16 @@ static int follow_pfn_pte(struct vm_area_struct *vma, unsigned long address, + return -EEXIST; + } + ++/* ++ * FOLL_FORCE can write to even unwritable pte's, but only ++ * after we've gone through a COW cycle and they are dirty. ++ */ ++static inline bool can_follow_write_pte(pte_t pte, unsigned int flags) ++{ ++ return pte_write(pte) || ++ ((flags & FOLL_FORCE) && (flags & FOLL_COW) && pte_dirty(pte)); ++} ++ + static struct page *follow_page_pte(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmd, unsigned int flags) + { +@@ -92,7 +102,7 @@ retry: + } + if ((flags & FOLL_NUMA) && pte_protnone(pte)) + goto no_page; +- if ((flags & FOLL_WRITE) && !pte_write(pte)) { ++ if ((flags & FOLL_WRITE) && !can_follow_write_pte(pte, flags)) { + pte_unmap_unlock(ptep, ptl); + return NULL; + } +@@ -352,7 +362,7 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma, + * reCOWed by userspace write). + */ + if ((ret & VM_FAULT_WRITE) && !(vma->vm_flags & VM_WRITE)) +- *flags &= ~FOLL_WRITE; ++ *flags |= FOLL_COW; + return 0; + } +
