author | Shawn Walker-Salas <shawn.walker@oracle.com> |
Thu, 21 Jan 2016 09:20:59 -0800 | |
changeset 5331 | 9c955076ffe3 |
permissions | -rw-r--r-- |
5331
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From 61e1caee5b3a79f8986248541839eb15d311a3a9 Mon Sep 17 00:00:00 2001 |
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From: Shawn Walker-Salas <[email protected]> |
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Date: Wed, 26 Aug 2015 15:24:41 -0700 |
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Subject: [PATCH 56/63] [release-branch.go1.5] cmd/go: fix Go buildid reading |
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on Solaris |
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MIME-Version: 1.0 |
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Content-Type: text/plain; charset=UTF-8 |
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Content-Transfer-Encoding: 8bit |
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TestNoteReading fails on Solaris with linkmode=external due to some |
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assumptions made about how ELF .note sections are written by some |
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linkers. |
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On current versions of Solaris and older derivatives, SHF_ALLOC is |
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intentionally ignored for .note sections unless the .note section is |
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assigned to the text segment via a mapfile. Also, if .note sections |
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are assigned to the text segment, no PT_NOTE program header will be |
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created thwarting Go's attempts at attempting to quickly find the |
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.note. |
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Furthermore, Go assumes that the relevant note segment will be placed |
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early in the file while the Solaris linker currently places the note |
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segment last in the file, additionally thwarting Go's optimisation |
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attempts that read only the first 16KB of the file to find the |
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buildid. |
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The fix is to detect when the note section is outside of the first |
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16KB of the file and then fallback to additionally reading that |
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section of the file. This way, in future versions of Solaris when |
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this linking behaviour is changed, the fast path will always succeed |
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and we'll only be slower if it fails; likewise, any other linker that |
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does this will also just work. |
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Fixes #12178 |
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Change-Id: I61c1dc3f744ae3ad63938386d2ace8a432c0efe1 |
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Reviewed-on: https://go-review.googlesource.com/14210 |
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Run-TryBot: Aram Hăvărneanu <[email protected]> |
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Reviewed-by: Aram Hăvărneanu <[email protected]> |
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Reviewed-on: https://go-review.googlesource.com/17142 |
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Run-TryBot: Russ Cox <[email protected]> |
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Reviewed-by: Russ Cox <[email protected]> |
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--- |
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src/cmd/go/note.go | 32 ++++++++++++++++++++++++++------ |
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src/cmd/go/note_test.go | 3 --- |
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src/cmd/link/internal/ld/elf.go | 4 ---- |
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3 files changed, 26 insertions(+), 13 deletions(-) |
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diff --git a/src/cmd/go/note.go b/src/cmd/go/note.go |
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index f8d6588..c7346a5 100644 |
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--- a/src/cmd/go/note.go |
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+++ b/src/cmd/go/note.go |
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@@ -70,11 +70,11 @@ func readELFNote(filename, name string, typ int32) ([]byte, error) { |
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var elfGoNote = []byte("Go\x00\x00") |
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-// readELFGoBuildID the Go build ID string from an ELF binary. |
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-// The Go build ID is stored in a note described by an ELF PT_NOTE prog header. |
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-// The caller has already opened filename, to get f, and read the first 4 kB out, in data. |
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+// The Go build ID is stored in a note described by an ELF PT_NOTE prog |
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+// header. The caller has already opened filename, to get f, and read |
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+// at least 4 kB out, in data. |
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func readELFGoBuildID(filename string, f *os.File, data []byte) (buildid string, err error) { |
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- // Assume the note content is in the first 4 kB, already read. |
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+ // Assume the note content is in the data, already read. |
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// Rewrite the ELF header to set shnum to 0, so that we can pass |
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// the data to elf.NewFile and it will decode the Prog list but not |
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// try to read the section headers and the string table from disk. |
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@@ -96,11 +96,31 @@ func readELFGoBuildID(filename string, f *os.File, data []byte) (buildid string, |
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return "", &os.PathError{Path: filename, Op: "parse", Err: err} |
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} |
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for _, p := range ef.Progs { |
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- if p.Type != elf.PT_NOTE || p.Off >= uint64(len(data)) || p.Off+p.Filesz >= uint64(len(data)) || p.Filesz < 16 { |
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+ if p.Type != elf.PT_NOTE || p.Filesz < 16 { |
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continue |
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} |
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|
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- note := data[p.Off : p.Off+p.Filesz] |
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+ var note []byte |
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+ if p.Off+p.Filesz < uint64(len(data)) { |
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+ note = data[p.Off : p.Off+p.Filesz] |
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+ } else { |
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+ // For some linkers, such as the Solaris linker, |
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+ // the buildid may not be found in data (which |
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+ // likely contains the first 16kB of the file) |
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+ // or even the first few megabytes of the file |
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+ // due to differences in note segment placement; |
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+ // in that case, extract the note data manually. |
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+ _, err = f.Seek(int64(p.Off), 0) |
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+ if err != nil { |
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+ return "", err |
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+ } |
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+ |
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+ note = make([]byte, p.Filesz) |
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+ _, err = io.ReadFull(f, note) |
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+ if err != nil { |
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+ return "", err |
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+ } |
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+ } |
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nameSize := ef.ByteOrder.Uint32(note) |
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valSize := ef.ByteOrder.Uint32(note[4:]) |
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tag := ef.ByteOrder.Uint32(note[8:]) |
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diff --git a/src/cmd/go/note_test.go b/src/cmd/go/note_test.go |
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index a5ecab1..39b79c5 100644 |
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--- a/src/cmd/go/note_test.go |
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+++ b/src/cmd/go/note_test.go |
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@@ -50,9 +50,6 @@ func testNoteReading(t *testing.T) { |
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// no external linking |
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t.Logf("no external linking - skipping linkmode=external test") |
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110 |
|
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- case "solaris": |
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- t.Logf("skipping - golang.org/issue/12178") |
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113 |
- |
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114 |
default: |
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tg.run("build", "-ldflags", "-buildid="+buildID+" -linkmode=external", "-o", tg.path("hello.exe"), tg.path("hello.go")) |
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id, err := main.ReadBuildIDFromBinary(tg.path("hello.exe")) |
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diff --git a/src/cmd/link/internal/ld/elf.go b/src/cmd/link/internal/ld/elf.go |
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118 |
index c9a5c99..9dedb0e 100644 |
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--- a/src/cmd/link/internal/ld/elf.go |
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+++ b/src/cmd/link/internal/ld/elf.go |
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@@ -1739,10 +1739,6 @@ func doelf() { |
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Addstring(shstrtab, ".note.go.pkg-list") |
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Addstring(shstrtab, ".note.go.deps") |
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124 |
} |
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125 |
- |
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126 |
- if buildid != "" { |
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- Addstring(shstrtab, ".note.go.buildid") |
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128 |
- } |
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129 |
} |
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130 |
|
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131 |
hasinitarr := Linkshared |
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132 |
-- |
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133 |
2.6.1 |
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134 |