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fs,permission: make handling of buffers consistent #52348

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merged 1 commit into from
Apr 6, 2024
Merged

fs,permission: make handling of buffers consistent #52348

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6 changes: 5 additions & 1 deletion lib/fs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1793,7 +1793,11 @@ function symlinkSync(target, path, type) {
if (permission.isEnabled()) {
// The permission model's security guarantees fall apart in the presence of
// relative symbolic links. Thus, we have to prevent their creation.
if (typeof target !== 'string' || !isAbsolute(toPathIfFileURL(target))) {
if (BufferIsBuffer(target)) {
if (!isAbsolute(BufferToString(target))) {
throw new ERR_ACCESS_DENIED('relative symbolic link target');
}
} else if (typeof target !== 'string' || !isAbsolute(toPathIfFileURL(target))) {
throw new ERR_ACCESS_DENIED('relative symbolic link target');
}
}
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9 changes: 8 additions & 1 deletion lib/internal/fs/promises.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ const {
SymbolAsyncDispose,
Uint8Array,
FunctionPrototypeBind,
uncurryThis,
} = primordials;

const { fs: constants } = internalBinding('constants');
Expand All @@ -30,6 +31,8 @@ const {

const binding = internalBinding('fs');
const { Buffer } = require('buffer');
const { isBuffer: BufferIsBuffer } = Buffer;
const BufferToString = uncurryThis(Buffer.prototype.toString);

const {
codes: {
Expand Down Expand Up @@ -985,7 +988,11 @@ async function symlink(target, path, type_) {
if (permission.isEnabled()) {
// The permission model's security guarantees fall apart in the presence of
// relative symbolic links. Thus, we have to prevent their creation.
if (typeof target !== 'string' || !isAbsolute(toPathIfFileURL(target))) {
if (BufferIsBuffer(target)) {
if (!isAbsolute(BufferToString(target))) {
throw new ERR_ACCESS_DENIED('relative symbolic link target');
}
} else if (typeof target !== 'string' || !isAbsolute(toPathIfFileURL(target))) {
throw new ERR_ACCESS_DENIED('relative symbolic link target');
}
}
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