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Graph/string-view-after-move-sso

AntiPattern

Move Invalidates String Views

string-view-after-move-sso

std::string_view becomes invalid after moving a std::string when the string uses SSO, because the short inline buffer can be relocated or destructively copied, leaving views pointing at stale character storage.

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Updated5/4/2026

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30 linked nodes

MATCHESSolution

you can save that as a `view` or a generated column — If you want that format to be available without needing `to_char()` in your `select`. Tension: without needing `to_char()` in your `select`. Outcome: you can save that as a `view` or a generated column.

MATCHESSolution

Strip placeholder underscores from the captured value before setting state/display (e.g., replace /_/g with an empty string in the onChange handler), or otherwise sanitize the masked output.

MATCHESSolution

If you want it to vanish from the table — depends on what you want to happen with the row if time passes so that it becomes invalid. Tension: that is not a good solution. Outcome: A better, simpler solution would be to use a view on the table that just excludes the offending rows.

MATCHESSolution

The only ways to avoid the problem are — define the view with the default `security_invoker = off`. Tension: create a view that only selects the "allowed" columns. Outcome: The only ways to avoid the problem are.

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if you're concerned about the password persisting somewhere either on disk or after your program terminates. Tension: password persisting somewhere either on disk or after your program terminates. Outcome: Lock the memory backing the string such that it c.

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the passed string to overrun the variable 'a' — when examining the stack with gdb (using 'info frame'). Tension: it doesn't happen. Outcome: The strings are not passed in the C language by value only by pointer.

MATCHESSolution

The changed code invokes undefined behaviour. — Java 25 FFM API. Tension: You can't rely on always getting this behaviour. Outcome: The caller's pointer is passed in to it, but it's never used.

MATCHESSolution

So build your fixed content for the view in the c'tor — things, that never change. Tension: even if this means to remove everything and add something new. Outcome: The two callbacks are always called for each navigation into this view in this order.

MATCHESSolution

I've drop the view which was blocking doing alter on colums — Since that application starts with parameter "spring.jpa.hibernate.ddl-auto" set to "update" without erros. Tension: According to @M.Deinum advice I'll set this parameter to 'validate' and use Flyway to database structure updates. Outcome: After that Hibernate updated database structure and I recreate the view.

MATCHESSolution

Use std::ostringstream, stream std::put_time output into it, then call str() to get a std::string

MATCHESSolution

Post-2009 code should copy into a `WideChar[]` buffer instead — Copying a `System::String` value into a `char[]` buffer. Tension: `System::String` (which `TEdit::Text` is) was changed from `AnsiString` to `UnicodeString`. Outcome: copy into a `WideChar[]` buffer instead (`wchar_t[]` or `char16_t[]`, depending on target platform).

MATCHESSolution

Instead of shifting to some f. Tension: These can't be `unique_ptr`, because they're not unique. Outcome: you could handle these by shifting to a `shared_ptr` instead.

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Use placement new instead of std::construct_at when you need direct prvalue initialization without an extra move or copy

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Use a vector-based backing store and keep computing string views from it

MATCHESSolution

Skip the SSO detector and switch to compiler-generated functions

MATCHESSolution

Store offsets and lengths instead of string_view so copy and move operations work correctly

MATCHESSolution

how to detect whether a given string is using SSO — take appropriate action in my class move constructor. Tension: view dataView to remain valid. Outcome: This fairly simple function works in practice.

MATCHESSolution

Use `std::views::as_rvalue(rhs)` for rvalue inputs and `lhs.append_range(rhs)` for lvalues

MATCHESSolution

Tension: I am not using direct pointers. Outcome: I would change the signature to:.

MATCHESSolution

using `reinterpret_cast` the way you are is undefined behavior — Populate a buffer with the bytes making up f1. Tension: No reinterpret_cast, no undefined behavior. Outcome: Populate f2 with the content of the buffer.

MATCHESSolution

This is not something that needs to be guessed at, as Microsoft has documented it: — in the absence of documentation to the contrary. Tension: the documentation isn't clear here. Outcome: one may assume that it is valid for `WindowsDuplicateString`.

MATCHESSolution

self-referential structs in Rust. Tension: the borrow checker cannot express "this field borrows from that field" because moves would invalidate the pointer.

MATCHESSolution

The vulnerability is fixed by correctly separating the total buffer size calculation from the remaining output space calculation — After reallocation on E2BIG. Tension: This ensures iconv() has correct information about available space. Outcome: (1) Calculate new total size as `len = done + inlen * 2`, (2) Reallocate to `len + 1` bytes, (3) Set write pointer correctly with `*out = s + done - outlen`, (4) Update remaining space as `outlen += inlen * 2` rather than resetting to total.

MATCHESSolution

Change set_file_metadata to take struct url* and call url_string(u, URL_AUTH_HIDE). Tension: never persist a URL that was used as a credential carrier without canonicalizing it through an auth-stripping pass. Outcome: This is what upstream did in wget 1.20.1.

MATCHESSolution

Two-part fix matching upstream binutils 2.35. Outcome: Alternatively, freeze the table (`table->frozen = 1`) during the entire section-merging phase so resizes never occur while external pointers are live.

MATCHESSolution

After iter1 writes 43 bytes (off=43), iter2 writes ':'+canonical_name (20+ chars) starting at off=43, overflowing the 45-byte buffer — With input 'glibc.malloc.mxfast=glibc.malloc.mxfast=512' (43 bytes), the buffer is 45 bytes. Tension: overflowing the 45-byte buffer. Outcome: Verified by examining fix commit 1056e5b4c3.

MATCHESSolution

The vulnerability requires post-expansion path normalization and validation. — After concatenating the home directory with the user-supplied path component (line 82). Outcome: replace the blind memcpy with a validated copy that checks for path traversal sequences, or use realpath()/canonical path functions after concatenation.

MATCHESSolution

Never cache raw pointers into a buffer that may be reallocated.

MATCHESSolution

in AT_SECURE context, non-SXID_ERASE tunables are copied back to tunestr.

MATCHESSolution

Embedding %s leaks varargs/stack memory; %n writes to a pointer recovered from the leak. — upd_wrtrtl at line 6994. Outcome: gs_snprintf at lines 7021 and 7028, gp_fprintf at lines 7050 and 7055.

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