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Merge bitcoin/bitcoin#24933: util: Replace non-threadsafe strerror

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e3a06a3c6c test: Add `strerror` to locale-dependence linter (laanwj)
f00fb1265a util: Increase buffer size to 1024 in SysErrorString (laanwj)
718da302c7 util: Refactor SysErrorString logic (laanwj)
e7f2f77756 util: Use strerror_s for SysErrorString on Windows (laanwj)
46971c6dbf util: Replace non-threadsafe strerror (laanwj)

Pull request description:

  Some uses of non-threadsafe `strerror` have snuck into the code since they were removed in #4152. Add a wrapper `SysErrorString` for thread-safe strerror alternatives (with code from `NetworkErrorString`) and replace all uses of `strerror` with this.

  Edit: I've also added a commit that refactors the code so that buf[] is never read at all if the function fails, making some fragile-looking code unnecessary.

  Edit2: from the linux manpage:
  ```
  ATTRIBUTES
         For an explanation of the terms used in this section, see attributes(7).

         ┌───────────────────┬───────────────┬─────────────────────────┐
         │Interface          │ Attribute     │ Value                   │
         ├───────────────────┼───────────────┼─────────────────────────┤
         │strerror()         │ Thread safety │ MT-Unsafe race:strerror │
         ├───────────────────┼───────────────┼─────────────────────────┤
  …
         ├───────────────────┼───────────────┼─────────────────────────┤
         │strerror_r(),      │ Thread safety │ MT-Safe                 │
         │strerror_l()       │               │                         │
         └───────────────────┴───────────────┴─────────────────────────┘
  ```
  As the function can be called from any thread at any time, using a non-thread-safe function is unacceptable.

ACKs for top commit:
  jonatack:
    ACK e3a06a3c6c

Tree-SHA512: 20e71ebb9e979d4e1d8cafbb2e32e20c2a63f09115fe72cdde67c8f80ae98c531d286f935fd8a6e92a18b72607d7bd3e846b2d871d9691a6036b0676de8aaf25
This commit is contained in:
laanwj
2022-05-04 20:56:50 +02:00
parent fe6a299fc0 e3a06a3c6c
commit 5e1aacab57
9 changed files with 69 additions and 20 deletions
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3
src/init.cpp
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@@ -65,6 +65,7 @@
#include <util/strencodings.h>
#include <util/string.h>
#include <util/syscall_sandbox.h>
#include <util/syserror.h>
#include <util/system.h>
#include <util/thread.h>
#include <util/threadnames.h>
@@ -150,7 +151,7 @@ static fs::path GetPidFile(const ArgsManager& args)
#endif
return true;
} else {
return InitError(strprintf(_("Unable to create the PID file '%s': %s"), fs::PathToString(GetPidFile(args)), std::strerror(errno)));
return InitError(strprintf(_("Unable to create the PID file '%s': %s"), fs::PathToString(GetPidFile(args)), SysErrorString(errno)));
}
}