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[release/8.0-staging] Support setting ACLs on file paths longer than MAX_PATH #113801

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Merged
Parent: [manual] Merge release/8.0-staging into release/8.0
merged 2 commits into from
Mar 23, 2025
Merged

[release/8.0-staging] Support setting ACLs on file paths longer than MAX_PATH #113801

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3f5282f
fix long path bug
karakasa Sep 22, 2023
ea72b6b
Simplify test with Math.Max
karakasa Sep 22, 2023
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2 changes: 1 addition & 1 deletion ...ystem.IO.FileSystem.AccessControl/src/System/Security/AccessControl/FileSystemSecurity.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,7 @@ internal void Persist(string fullPath)
try
{
AccessControlSections persistRules = GetAccessControlSectionsFromChanges();
base.Persist(fullPath, persistRules);
base.Persist(PathInternal.EnsureExtendedPrefixIfNeeded(fullPath), persistRules);
OwnerModified = GroupModified = AuditRulesModified = AccessRulesModified = false;
}
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19 changes: 19 additions & 0 deletions src/libraries/System.IO.FileSystem.AccessControl/tests/FileSystemAclExtensionsTests.cs
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Expand Up @@ -143,6 +143,25 @@ public void SetAccessControl_FileInfo_FileSecurity_Success()
fileInfo.SetAccessControl(fileSecurity);
}

[Fact]
public void SetAccessControl_FileInfo_FileSecurity_Success_NameLongerThanMaxShortPath()
{
using var directory = new TempAclDirectory();

const int MaxShortPath = 260;
int fileNameLength = Math.Max(MaxShortPath - directory.Path.Length, 1);

string path = Path.Combine(directory.Path, new string('1', fileNameLength) + ".txt");
using var file = new TempFile(path, 1);
var fileInfo = new FileInfo(file.Path);
FileSecurity fileSecurity = fileInfo.GetAccessControl(AccessControlSections.Access);

var newAccessRule = new FileSystemAccessRule(Helpers.s_NetworkServiceNTAccount, FileSystemRights.Write, AccessControlType.Allow);
fileSecurity.SetAccessRule(newAccessRule);

fileInfo.SetAccessControl(fileSecurity);
}

[Fact]
public void SetAccessControl_FileStream_FileSecurity_InvalidArguments()
{
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