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Use umask() to Constrain Created File Permissions #2495

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merged 1 commit into from
Feb 17, 2021

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felixhandte
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This commit addresses #2491.

Note that a downside of this solution is that it is global: umask() affects
all file creation calls in the process. I believe this is safe since
fileio.c functions should only ever be used in the zstd binary, and these
are (almost) the only files ever created by zstd, and AIUI they're only
created in a single thread. So we can get away with messing with global state.

Note that this doesn't change the permissions of files created by dibio.c.
I'm not sure what those should be...

This commit addresses facebook#2491.

Note that a downside of this solution is that it is global: `umask()` affects
all file creation calls in the process. I believe this is safe since
`fileio.c` functions should only ever be used in the zstd binary, and these
are (almost) the only files ever created by zstd, and AIUI they're only
created in a single thread. So we can get away with messing with global state.

Note that this doesn't change the permissions of files created by `dibio.c`.
I'm not sure what those should be...
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4 participants