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vfs: Make OpenFile and friends return EINVAL if O_RDONLY and O_TRUNC

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Before this change Open("name", os.O_RDONLY|os.O_TRUNC) would have
truncated the file.  This is what Linux does, but is counterintuitive.
POSIX states this is undefined, so return an error in this case
instead.  This preserves the invariant O_RDONLY => file is not
changed.
This commit is contained in:
Nick Craig-Wood
2018-02-23 22:39:28 +00:00
parent 3282fd26af
commit 54deb01f00
7 changed files with 107 additions and 88 deletions
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168
vfs/open_test.go
View File

@@ -36,13 +36,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_TRUNC,
what: "os.O_RDONLY|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_SYNC,
what: "os.O_RDONLY|os.O_SYNC",
@@ -56,13 +56,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_EXCL,
what: "os.O_RDONLY|os.O_EXCL",
@@ -76,13 +76,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_EXCL | os.O_TRUNC,
what: "os.O_RDONLY|os.O_EXCL|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_EXCL | os.O_SYNC,
what: "os.O_RDONLY|os.O_EXCL|os.O_SYNC",
@@ -96,13 +96,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_EXCL | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_EXCL|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_CREATE,
what: "os.O_RDONLY|os.O_CREATE",
@@ -116,13 +116,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_CREATE | os.O_TRUNC,
what: "os.O_RDONLY|os.O_CREATE|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_CREATE | os.O_SYNC,
what: "os.O_RDONLY|os.O_CREATE|os.O_SYNC",
@@ -136,13 +136,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_CREATE | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_CREATE|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_CREATE | os.O_EXCL,
what: "os.O_RDONLY|os.O_CREATE|os.O_EXCL",
@@ -156,10 +156,10 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_CREATE | os.O_EXCL | os.O_TRUNC,
what: "os.O_RDONLY|os.O_CREATE|os.O_EXCL|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: EEXIST,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
@@ -176,10 +176,10 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_CREATE | os.O_EXCL | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_CREATE|os.O_EXCL|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: EEXIST,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
@@ -196,13 +196,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_SYNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_SYNC",
@@ -216,13 +216,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_EXCL,
what: "os.O_RDONLY|os.O_APPEND|os.O_EXCL",
@@ -236,13 +236,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_EXCL | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_EXCL|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_EXCL | os.O_SYNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_EXCL|os.O_SYNC",
@@ -256,13 +256,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_EXCL | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_EXCL|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: ENOENT,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE",
@@ -276,13 +276,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE | os.O_SYNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE|os.O_SYNC",
@@ -296,13 +296,13 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: nil,
readExistingErr: io.EOF,
writeExistingErr: EBADF,
contents: "",
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE | os.O_EXCL,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE|os.O_EXCL",
@@ -316,10 +316,10 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE | os.O_EXCL | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE|os.O_EXCL|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: EEXIST,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",
@@ -336,10 +336,10 @@ var openTests = []openTest{
}, {
flags: os.O_RDONLY | os.O_APPEND | os.O_CREATE | os.O_EXCL | os.O_SYNC | os.O_TRUNC,
what: "os.O_RDONLY|os.O_APPEND|os.O_CREATE|os.O_EXCL|os.O_SYNC|os.O_TRUNC",
openNonExistentErr: nil,
readNonExistentErr: io.EOF,
writeNonExistentErr: EBADF,
openExistingErr: EEXIST,
openNonExistentErr: EINVAL,
readNonExistentErr: nil,
writeNonExistentErr: nil,
openExistingErr: EINVAL,
readExistingErr: nil,
writeExistingErr: nil,
contents: "hello",