1c6a1206bd
If reallocation fails in function list, then reset the size to 0 again. Without the reset, the next call assumes that `members` points to a memory location with reserved space. Also use size_t instead of int for size to prevent signed integer overflows. The length of group lines is not limited. Fixes45c0003e53(4.14 release series) Proof of Concept: - Prepare a group file (one long group line and a shorter one, both with a list of users) $ echo -n "root:x:0:" > /tmp/uwu $ yes , | tr -d '\n' | dd of=/tmp/uwu bs=10 count=3145728 seek=1 conv=notrunc iflag=fullblock $ echo -e "\nbin:x:1:," >> /tmp/uwu - Run grpck with tight memory constraints $ ulimit -d 102400 $ grpck /tmp/uwu Segmentation fault (core dumped) Reviewed-by: Alejandro Colomar <alx@kernel.org> Signed-off-by: Samanta Navarro <ferivoz@riseup.net> Cherry-picked-from:a9e07c0feb("lib/sgetgrent.c: fix null pointer dereference") Link: <https://github.com/shadow-maint/shadow/pull/904> Signed-off-by: Alejandro Colomar <alx@kernel.org>
shadow-utils
Introduction
The shadow-utils package includes the necessary programs for converting UNIX password files to the shadow password format, plus programs for managing user and group accounts. The pwconv command converts passwords to the shadow password format. The pwunconv command unconverts shadow passwords and generates a passwd file (a standard UNIX password file). The pwck command checks the integrity of password and shadow files. The lastlog command prints out the last login times for all users. The useradd, userdel, and usermod commands are used for managing user accounts. The groupadd, groupdel, and groupmod commands are used for managing group accounts.
Sites
Contacts
There are several ways to contact us:
- the general discussion mailing list
- the #shadow IRC channel on libera.chat:
- irc://irc.libera.chat/shadow
Mailing archives
- the general discussion mailing list archive
- the commit mailing list archive, only used for historical purposes
Contributions
Contributions are welcome. Follow the guidelines before posting any patches.
Authors and maintainers
Authors and maintainers are listed in AUTHORS.md.