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authorRich Felker <dalias@aerifal.cx>2011-04-03 12:20:51 -0400
committerRich Felker <dalias@aerifal.cx>2011-04-03 12:20:51 -0400
commitc9b2d8016fca3b0545433e9d58a04c038b6fc921 (patch)
treeb95287cafebf3496a773131f277f60f506cb1519 /src/stat
parent6e9ed66d0db17ac9ad2342fc107e8c4528fce0ba (diff)
downloadmusl-c9b2d8016fca3b0545433e9d58a04c038b6fc921.tar.gz
don't trust siginfo in rsyscall handler
for some inexplicable reason, linux allows the sender of realtime signals to spoof its identity. permission checks for sending signals should limit the impact to same-user processes, but just to be safe, we avoid trusting the siginfo structure and instead simply examine the program state to see if we're in the middle of a legitimate rsyscall.
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