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bug#60291: chmod a-r does not fail for vfat


From: Paul Eggert
Subject: bug#60291: chmod a-r does not fail for vfat
Date: Fri, 23 Dec 2022 21:59:10 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2

On 12/23/22 17:09, Krzysztof ┼╗elechowski wrote:
chmod a-r a.txt && stat a.txt

Expected: chmod: unsupported permissions
Got: -r--r--r--
This is wrong because the command chmod had failed to set the permissions

The chmod command is doing the right thing; the problem lies elsewhere. Run "strace chmod a-r a.txt". You should see something like "fchmodat(AT_FDCWD, "a.txt", 0200) = 0" which means chmod told the kernel to change a.txt's permissions to -w------- and the kernel responded that it did so successfully.

The problem here is a squirrelly filesystem. Run "man ntfs-3g" and look for "Access Handling and Security".






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