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8073061: (fs) Files.copy(foo, bar, REPLACE_EXISTING) deletes bar even if foo is not readable

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2023-09-26 15:27:44 +00:00
parent efb7e85ecf
commit 36ac83904c
5 changed files with 314 additions and 14 deletions
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19
src/java.base/unix/classes/sun/nio/fs/UnixFileSystem.java
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@ -891,6 +891,10 @@ abstract class UnixFileSystem
// get attributes of source file (don't follow links)
try {
sourceAttrs = UnixFileAttributes.get(source, false);
if (sourceAttrs.isDirectory()) {
// ensure source can be moved
access(source, W_OK);
}
} catch (UnixException x) {
x.rethrowAsIOException(source);
}
@ -910,10 +914,9 @@ abstract class UnixFileSystem
if (targetExists) {
if (sourceAttrs.isSameFile(targetAttrs))
return; // nothing to do as files are identical
if (!flags.replaceExisting) {
if (!flags.replaceExisting)
throw new FileAlreadyExistsException(
target.getPathForExceptionMessage());
}
// attempt to delete target
try {
@ -1019,6 +1022,17 @@ abstract class UnixFileSystem
sm.checkPermission(new LinkPermission("symbolic"));
}
// ensure source can be copied
if (!sourceAttrs.isSymbolicLink() || flags.followLinks) {
try {
// the access(2) system call always follows links so it
// is suppressed if the source is an unfollowed link
access(source, R_OK);
} catch (UnixException exc) {
exc.rethrowAsIOException(source);
}
}
// get attributes of target file (don't follow links)
try {
targetAttrs = UnixFileAttributes.get(target, false);
@ -1037,6 +1051,7 @@ abstract class UnixFileSystem
if (!flags.replaceExisting)
throw new FileAlreadyExistsException(
target.getPathForExceptionMessage());
try {
if (targetAttrs.isDirectory()) {
rmdir(target);