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| author | Alexander Monakov <amonakov@ispras.ru> | 2017-07-05 00:51:05 +0300 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2017-07-04 17:53:58 -0400 |
| commit | bc42dcbfd9466c22d8ab0f8235e5091689a95aad (patch) | |
| tree | 0d33a79c5b386f7358b7ec250d3f50a1b028efad | |
| parent | d906fa3118c888227d858b6d642a09e055eca2b4 (diff) | |
| download | musl-bc42dcbfd9466c22d8ab0f8235e5091689a95aad.tar.gz | |
fix undefined behavior in ptrace
| -rw-r--r-- | src/linux/ptrace.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/linux/ptrace.c b/src/linux/ptrace.c index 83b8022b..a3f393d9 100644 --- a/src/linux/ptrace.c +++ b/src/linux/ptrace.c @@ -7,14 +7,18 @@ long ptrace(int req, ...) { va_list ap; pid_t pid; - void *addr, *data, *addr2; + void *addr, *data, *addr2 = 0; long ret, result; va_start(ap, req); pid = va_arg(ap, pid_t); addr = va_arg(ap, void *); data = va_arg(ap, void *); - addr2 = va_arg(ap, void *); + /* PTRACE_{READ,WRITE}{DATA,TEXT} (16...19) are specific to SPARC. */ +#ifdef PTRACE_READDATA + if ((unsigned)req - PTRACE_READDATA < 4) + addr2 = va_arg(ap, void *); +#endif va_end(ap); if (req-1U < 3) data = &result; |