diff options
Diffstat (limited to 'target')
| -rw-r--r-- | target/linux/patches/4.14.44/vdso2.patch | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/target/linux/patches/4.14.44/vdso2.patch b/target/linux/patches/4.14.44/vdso2.patch new file mode 100644 index 000000000..a6f061b9b --- /dev/null +++ b/target/linux/patches/4.14.44/vdso2.patch @@ -0,0 +1,290 @@ +diff -Nur linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c linux-4.14.44/arch/x86/entry/vdso/vdso2c.c +--- linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c 2018-05-25 16:18:02.000000000 +0200 ++++ linux-4.14.44/arch/x86/entry/vdso/vdso2c.c 2018-05-31 02:09:00.000000000 +0200 +@@ -64,7 +64,15 @@ + #include <tools/le_byteshift.h> + + #include <linux/elf.h> ++#ifdef __linux__ + #include <linux/types.h> ++#else ++typedef _Bool bool; ++enum { ++ false = 0, ++ true = 1 ++}; ++#endif + + const char *outfilename; + +@@ -86,6 +94,7 @@ + sym_hvclock_page, + }; + ++ + struct vdso_sym { + const char *name; + bool export; +diff -Nur linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c.orig linux-4.14.44/arch/x86/entry/vdso/vdso2c.c.orig +--- linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c.orig 1970-01-01 01:00:00.000000000 +0100 ++++ linux-4.14.44/arch/x86/entry/vdso/vdso2c.c.orig 2018-05-25 16:18:02.000000000 +0200 +@@ -0,0 +1,259 @@ ++/* ++ * vdso2c - A vdso image preparation tool ++ * Copyright (c) 2014 Andy Lutomirski and others ++ * Licensed under the GPL v2 ++ * ++ * vdso2c requires stripped and unstripped input. It would be trivial ++ * to fully strip the input in here, but, for reasons described below, ++ * we need to write a section table. Doing this is more or less ++ * equivalent to dropping all non-allocatable sections, but it's ++ * easier to let objcopy handle that instead of doing it ourselves. ++ * If we ever need to do something fancier than what objcopy provides, ++ * it would be straightforward to add here. ++ * ++ * We're keep a section table for a few reasons: ++ * ++ * The Go runtime had a couple of bugs: it would read the section ++ * table to try to figure out how many dynamic symbols there were (it ++ * shouldn't have looked at the section table at all) and, if there ++ * were no SHT_SYNDYM section table entry, it would use an ++ * uninitialized value for the number of symbols. An empty DYNSYM ++ * table would work, but I see no reason not to write a valid one (and ++ * keep full performance for old Go programs). This hack is only ++ * needed on x86_64. ++ * ++ * The bug was introduced on 2012-08-31 by: ++ * https://code.google.com/p/go/source/detail?r=56ea40aac72b ++ * and was fixed on 2014-06-13 by: ++ * https://code.google.com/p/go/source/detail?r=fc1cd5e12595 ++ * ++ * Binutils has issues debugging the vDSO: it reads the section table to ++ * find SHT_NOTE; it won't look at PT_NOTE for the in-memory vDSO, which ++ * would break build-id if we removed the section table. Binutils ++ * also requires that shstrndx != 0. See: ++ * https://sourceware.org/bugzilla/show_bug.cgi?id=17064 ++ * ++ * elfutils might not look for PT_NOTE if there is a section table at ++ * all. I don't know whether this matters for any practical purpose. ++ * ++ * For simplicity, rather than hacking up a partial section table, we ++ * just write a mostly complete one. We omit non-dynamic symbols, ++ * though, since they're rather large. ++ * ++ * Once binutils gets fixed, we might be able to drop this for all but ++ * the 64-bit vdso, since build-id only works in kernel RPMs, and ++ * systems that update to new enough kernel RPMs will likely update ++ * binutils in sync. build-id has never worked for home-built kernel ++ * RPMs without manual symlinking, and I suspect that no one ever does ++ * that. ++ */ ++ ++#include <inttypes.h> ++#include <stdint.h> ++#include <unistd.h> ++#include <stdarg.h> ++#include <stdlib.h> ++#include <stdio.h> ++#include <string.h> ++#include <fcntl.h> ++#include <err.h> ++ ++#include <sys/mman.h> ++#include <sys/types.h> ++ ++#include <tools/le_byteshift.h> ++ ++#include <linux/elf.h> ++#include <linux/types.h> ++ ++const char *outfilename; ++ ++/* Symbols that we need in vdso2c. */ ++enum { ++ sym_vvar_start, ++ sym_vvar_page, ++ sym_hpet_page, ++ sym_pvclock_page, ++ sym_hvclock_page, ++ sym_VDSO_FAKE_SECTION_TABLE_START, ++ sym_VDSO_FAKE_SECTION_TABLE_END, ++}; ++ ++const int special_pages[] = { ++ sym_vvar_page, ++ sym_hpet_page, ++ sym_pvclock_page, ++ sym_hvclock_page, ++}; ++ ++struct vdso_sym { ++ const char *name; ++ bool export; ++}; ++ ++struct vdso_sym required_syms[] = { ++ [sym_vvar_start] = {"vvar_start", true}, ++ [sym_vvar_page] = {"vvar_page", true}, ++ [sym_hpet_page] = {"hpet_page", true}, ++ [sym_pvclock_page] = {"pvclock_page", true}, ++ [sym_hvclock_page] = {"hvclock_page", true}, ++ [sym_VDSO_FAKE_SECTION_TABLE_START] = { ++ "VDSO_FAKE_SECTION_TABLE_START", false ++ }, ++ [sym_VDSO_FAKE_SECTION_TABLE_END] = { ++ "VDSO_FAKE_SECTION_TABLE_END", false ++ }, ++ {"VDSO32_NOTE_MASK", true}, ++ {"__kernel_vsyscall", true}, ++ {"__kernel_sigreturn", true}, ++ {"__kernel_rt_sigreturn", true}, ++ {"int80_landing_pad", true}, ++}; ++ ++__attribute__((format(printf, 1, 2))) __attribute__((noreturn)) ++static void fail(const char *format, ...) ++{ ++ va_list ap; ++ va_start(ap, format); ++ fprintf(stderr, "Error: "); ++ vfprintf(stderr, format, ap); ++ if (outfilename) ++ unlink(outfilename); ++ exit(1); ++ va_end(ap); ++} ++ ++/* ++ * Evil macros for little-endian reads and writes ++ */ ++#define GLE(x, bits, ifnot) \ ++ __builtin_choose_expr( \ ++ (sizeof(*(x)) == bits/8), \ ++ (__typeof__(*(x)))get_unaligned_le##bits(x), ifnot) ++ ++extern void bad_get_le(void); ++#define LAST_GLE(x) \ ++ __builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le()) ++ ++#define GET_LE(x) \ ++ GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_GLE(x)))) ++ ++#define PLE(x, val, bits, ifnot) \ ++ __builtin_choose_expr( \ ++ (sizeof(*(x)) == bits/8), \ ++ put_unaligned_le##bits((val), (x)), ifnot) ++ ++extern void bad_put_le(void); ++#define LAST_PLE(x, val) \ ++ __builtin_choose_expr(sizeof(*(x)) == 1, *(x) = (val), bad_put_le()) ++ ++#define PUT_LE(x, val) \ ++ PLE(x, val, 64, PLE(x, val, 32, PLE(x, val, 16, LAST_PLE(x, val)))) ++ ++ ++#define NSYMS (sizeof(required_syms) / sizeof(required_syms[0])) ++ ++#define BITSFUNC3(name, bits, suffix) name##bits##suffix ++#define BITSFUNC2(name, bits, suffix) BITSFUNC3(name, bits, suffix) ++#define BITSFUNC(name) BITSFUNC2(name, ELF_BITS, ) ++ ++#define INT_BITS BITSFUNC2(int, ELF_BITS, _t) ++ ++#define ELF_BITS_XFORM2(bits, x) Elf##bits##_##x ++#define ELF_BITS_XFORM(bits, x) ELF_BITS_XFORM2(bits, x) ++#define ELF(x) ELF_BITS_XFORM(ELF_BITS, x) ++ ++#define ELF_BITS 64 ++#include "vdso2c.h" ++#undef ELF_BITS ++ ++#define ELF_BITS 32 ++#include "vdso2c.h" ++#undef ELF_BITS ++ ++static void go(void *raw_addr, size_t raw_len, ++ void *stripped_addr, size_t stripped_len, ++ FILE *outfile, const char *name) ++{ ++ Elf64_Ehdr *hdr = (Elf64_Ehdr *)raw_addr; ++ ++ if (hdr->e_ident[EI_CLASS] == ELFCLASS64) { ++ go64(raw_addr, raw_len, stripped_addr, stripped_len, ++ outfile, name); ++ } else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) { ++ go32(raw_addr, raw_len, stripped_addr, stripped_len, ++ outfile, name); ++ } else { ++ fail("unknown ELF class\n"); ++ } ++} ++ ++static void map_input(const char *name, void **addr, size_t *len, int prot) ++{ ++ off_t tmp_len; ++ ++ int fd = open(name, O_RDONLY); ++ if (fd == -1) ++ err(1, "%s", name); ++ ++ tmp_len = lseek(fd, 0, SEEK_END); ++ if (tmp_len == (off_t)-1) ++ err(1, "lseek"); ++ *len = (size_t)tmp_len; ++ ++ *addr = mmap(NULL, tmp_len, prot, MAP_PRIVATE, fd, 0); ++ if (*addr == MAP_FAILED) ++ err(1, "mmap"); ++ ++ close(fd); ++} ++ ++int main(int argc, char **argv) ++{ ++ size_t raw_len, stripped_len; ++ void *raw_addr, *stripped_addr; ++ FILE *outfile; ++ char *name, *tmp; ++ int namelen; ++ ++ if (argc != 4) { ++ printf("Usage: vdso2c RAW_INPUT STRIPPED_INPUT OUTPUT\n"); ++ return 1; ++ } ++ ++ /* ++ * Figure out the struct name. If we're writing to a .so file, ++ * generate raw output insted. ++ */ ++ name = strdup(argv[3]); ++ namelen = strlen(name); ++ if (namelen >= 3 && !strcmp(name + namelen - 3, ".so")) { ++ name = NULL; ++ } else { ++ tmp = strrchr(name, '/'); ++ if (tmp) ++ name = tmp + 1; ++ tmp = strchr(name, '.'); ++ if (tmp) ++ *tmp = '\0'; ++ for (tmp = name; *tmp; tmp++) ++ if (*tmp == '-') ++ *tmp = '_'; ++ } ++ ++ map_input(argv[1], &raw_addr, &raw_len, PROT_READ); ++ map_input(argv[2], &stripped_addr, &stripped_len, PROT_READ); ++ ++ outfilename = argv[3]; ++ outfile = fopen(outfilename, "w"); ++ if (!outfile) ++ err(1, "%s", argv[2]); ++ ++ go(raw_addr, raw_len, stripped_addr, stripped_len, outfile, name); ++ ++ munmap(raw_addr, raw_len); ++ munmap(stripped_addr, stripped_len); ++ fclose(outfile); ++ ++ return 0; ++} |