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LibSantizer: Read $UBSAN_OPTIONS to set deadliness on first print

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The first time we want to print a UBSAN violation, the UBSAN runtime
in userspace will get the UBSAN_OPTIONS environment variable to check if
it contains the string "halt_on_error=1". This is clearly not robust to
invalid options or adding more options, but it gets the job done at the
moment. :^)
This commit is contained in:
Andrew Kaster 2021-06-27 23:35:58 -06:00 committed by Ali Mohammad Pur
parent 97444f0a25
commit 882002c566
Notes: sideshowbarker 2024-07-18 11:22:02 +09:00 
Author: https://github.com/ADKaster
Commit: https://github.com/SerenityOS/serenity/commit/882002c5669
Pull-request: https://github.com/SerenityOS/serenity/pull/8285
Reviewed-by: https://github.com/alimpfard
1 changed files with 10 additions and 1 deletions
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11
Userland/Libraries/LibSanitizer/UBSanitizer.cpp
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@ -10,7 +10,7 @@
using namespace AK::UBSanitizer;
// FIXME: Parse option from UBSAN_OPTIONS: halt_on_error=0 or 1
bool AK::UBSanitizer::g_ubsan_is_deadly { false }; // FIXME: Make true!!
bool AK::UBSanitizer::g_ubsan_is_deadly { false };
#define WARNLN_AND_DBGLN(fmt, ...) \
warnln(fmt, ##__VA_ARGS__); \
@ -28,6 +28,15 @@ static void print_location(const SourceLocation& location)
// FIXME: Dump backtrace of this process (with symbols? without symbols?) in case the user wants non-deadly UBSAN
// Should probably go through the kernel for SC_dump_backtrace, then access the loader's symbol tables rather than
// going through the symbolizer service?
static bool checked_env_for_deadly = false;
if (!checked_env_for_deadly) {
checked_env_for_deadly = true;
StringView options = getenv("UBSAN_OPTIONS");
// FIXME: Parse more options and complain about invalid options
if (!options.is_null() && options.contains("halt_on_error=1"))
g_ubsan_is_deadly = true;
}
if (g_ubsan_is_deadly) {
WARNLN_AND_DBGLN("UB is configured to be deadly");
VERIFY_NOT_REACHED();