mirror of
https://github.com/lucannez64/darling-lol.git
synced 2026-10-26 19:47:42 +00:00
31 lines
1.3 KiB
Diff
31 lines
1.3 KiB
Diff
diff --git a/libsystem_trace/unpack_buffer.m b/libsystem_trace/unpack_buffer.m
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index 6ad0785..4f27cde 100644
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--- a/libsystem_trace/unpack_buffer.m
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+++ b/libsystem_trace/unpack_buffer.m
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@@ -191,7 +191,10 @@ char *os_log_decode_buffer(const char *formatString, uint8_t *buffer, uint32_t b
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libtrace_assert(readScalar(&buffer[bufferIndex], itemSize, &pointer), "failed to read string pointer from buffer");
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bufferIndex += itemSize;
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- formattedArgument = (char*)pointer;
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+ /* darling-lol: a NULL string pointer (os_log("%s", NULL))
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+ * must not kill the logging process in strnlen() below.
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+ * Print "(null)" like printf does. */
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+ formattedArgument = (pointer != 0) ? (char*)pointer : "(null)";
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formattedArgumentNeedsFree = false;
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formattedArgumentLength = (size_t)maxLength;
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@@ -360,6 +363,13 @@ char *os_log_decode_buffer(const char *formatString, uint8_t *buffer, uint32_t b
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++formatIndex;
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+ /* darling-lol: never strnlen(NULL) -- asprintf/strdup above can
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+ * fail, and a NULL here used to SIGSEGV every helper process
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+ * that logged during startup. */
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+ if (formattedArgument == NULL) {
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+ formattedArgument = "(null)";
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+ formattedArgumentNeedsFree = false;
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+ }
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formattedArgumentLength = strnlen(formattedArgument, formattedArgumentLength);
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#if OS_LOG_PRIVACY
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