xz: Improve compatibility with systems without capability mode support
When the kernel is built without capability mode support, or when using an emulator like qemu-user-static that does not translate system calls, these calls will return a negative number and set the errno to ENOSYS. However, this error does not indicate a real programming or runtime error and is generally ignored by base system applications built with capability mode sandboxing. Match this behavior by making xz(1) to ignore ENOSYS errors when calling capability mode system calls too. PR: 269185 Reported by: Dan Kotowski MFC after: 2 days
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@ -193,23 +193,24 @@ io_sandbox_enter(int src_fd)
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cap_rights_t rights;
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if (cap_rights_limit(src_fd, cap_rights_init(&rights,
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CAP_EVENT, CAP_FCNTL, CAP_LOOKUP, CAP_READ, CAP_SEEK)))
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CAP_EVENT, CAP_FCNTL, CAP_LOOKUP, CAP_READ, CAP_SEEK)) < 0 &&
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errno != ENOSYS)
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goto error;
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if (cap_rights_limit(STDOUT_FILENO, cap_rights_init(&rights,
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CAP_EVENT, CAP_FCNTL, CAP_FSTAT, CAP_LOOKUP,
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CAP_WRITE, CAP_SEEK)))
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CAP_WRITE, CAP_SEEK)) < 0 && errno != ENOSYS)
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goto error;
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if (cap_rights_limit(user_abort_pipe[0], cap_rights_init(&rights,
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CAP_EVENT)))
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CAP_EVENT)) < 0 && errno != ENOSYS)
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goto error;
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if (cap_rights_limit(user_abort_pipe[1], cap_rights_init(&rights,
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CAP_WRITE)))
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CAP_WRITE)) < 0 && errno != ENOSYS)
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goto error;
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if (cap_enter())
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if (cap_enter() < 0 && errno != ENOSYS)
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goto error;
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#elif defined(HAVE_PLEDGE)
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