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[TT: minor stylistic changes]
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Modify apk_resolve_[ug]id to take the user/groupname as a blob, so
proper length checking is done and honored.
==31584== Conditional jump or move depends on uninitialised value(s)
==31584== at 0x5C8CA5: strlen (strlen.c:17)
==31584== by 0x432575: APK_BLOB_STR (apk_blob.h:79)
==31584== by 0x4350EB: apk_resolve_uid (io.c:1112)
==31584== by 0x43696C: apk_tar_parse (io_archive.c:152)
==31584== by 0x4271BC: apk_pkg_read (package.c:929)
==31584== by 0x402D75: add_main (app_add.c:163)
==31584== by 0x40D5FF: main (apk-static.c:516)
Fixes a potential crash (DoS) on a crafted TAR file. CVE-2021-30139.
Reported-by: Sören Tempel <soeren+git@soeren-tempel.net>
Reviewed-by: Ariadne Conill <ariadne@dereferenced.org>
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If apk is run as a non-root user, it's not possible to chown files.
Maintainers note: minor wording changes on commit log and man page.
Signed-off-by: Fredrik Gustafsson <fredrigu@axis.com>
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