Messages in this thread | | | From | (David Wagner) | Subject | Re: [PATCH] new syscall: flink | Date | 7 Apr 2003 06:43:40 GMT |
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H. Peter Anvin wrote: >Here is a better piece of sample code that actually shows a >permissions violation happening: > >[...] >mkdir("testdir", 0700) = 0 >open("testdir/testfile", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3 >write(3, "Ansiktsburk\n", 12) = 12 >close(3) = 0 >open("testdir/testfile", O_RDONLY) = 3 >chmod("testdir", 0) = 0 >open("/proc/self/fd/3", O_RDWR) = 4 >write(4, "Tjo fidelittan hatt!\n", 21) = 21
You're right! Good point. I retract the comments in my previous email. (I did try an experiment like this, but apparently not the right one.)
My conclusion: /proc/*/fd is a security hole. It should be fixed. Do you agree? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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