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container: reject strings larger than a page

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The vfs stores these values in a page obtained via GFP, and silently stops copying once the page is filled. This check prevents confusing behaviour in such cases.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra
2026-05-03 17:30:25 +09:00
parent 3fa7ac04e4
commit 162265b47e
1 changed files with 4 additions and 0 deletions
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4
container/errors.go
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@@ -118,6 +118,10 @@ func errnoFallback(op, path string, err error) (syscall.Errno, *os.PathError) {
// mount wraps syscall.Mount for error handling. // mount wraps syscall.Mount for error handling.
func mount(source, target, fstype string, flags uintptr, data string) error { func mount(source, target, fstype string, flags uintptr, data string) error {
if max(len(source), len(target), len(data))+1 > os.Getpagesize() {
return &MountError{source, target, fstype, flags, data, syscall.ENOMEM}
}
err := syscall.Mount(source, target, fstype, flags, data) err := syscall.Mount(source, target, fstype, flags, data)
if err == nil { if err == nil {
return nil return nil