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[solved] zstd -t modifies /dev/null file mode bits
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mike155
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PostPosted: Mon Sep 18, 2017 12:11 pm    Post subject: [solved] zstd -t modifies /dev/null file mode bits Reply with quote

I installed app-arch/zstd-1.3.0. It works fine. But if I run "zstd -t" as root, it modifies file mode bits of /dev/null:
Code:
# ls -la /dev/null
crw-rw-rw- 1 root root 1, 3 Sep 18 13:12 /dev/null

# zstd -t linux.tgz
linux.tgz : 27002880 bytes

# ls -la /dev/null
crw-r----- 1 root root 1, 3 Sep 18 13:12 /dev/null

A strace shows:
Code:
# strace -o trace.txt -f zstd -t linux.tgz
linux.tgz : 27002880 bytes

# grep "/dev/null" trace.txt
20269 open("/dev/null", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
20269 utime("/dev/null", {actime=2017-09-18T13:50:14+0200, modtime=2017-09-18T13:12:41+0200}) = 0
20269 chown("/dev/null", 0, 0) = 0
20269 chmod("/dev/null", 0640) = 0

What the hell is going on? Does anyone else see this?


Last edited by mike155 on Mon Sep 18, 2017 9:18 pm; edited 1 time in total
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mike155
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PostPosted: Mon Sep 18, 2017 12:53 pm    Post subject: Reply with quote

I filed a bug on the project's bug tracker: https://github.com/facebook/zstd/issues/851
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mike155
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PostPosted: Mon Sep 18, 2017 9:16 pm    Post subject: Reply with quote

Upstream confirmed the bug and proposed a fix, which will probably be part of the next release.
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