Fix posix_getpwnam()/posix_getpwuid() crash on NULL passwd fields#22426
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iliaal wants to merge 1 commit into
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Fix posix_getpwnam()/posix_getpwuid() crash on NULL passwd fields#22426iliaal wants to merge 1 commit into
iliaal wants to merge 1 commit into
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php_posix_passwd_to_array() passed pw_name, pw_passwd, pw_gecos, pw_dir and pw_shell straight to add_assoc_string() with no NULL guard, so a NULL field segfaults via zend_string_init(). glibc's files NSS backend normalizes empty fields to "", but third-party NSS modules (nss-systemd, nss-ldap, sssd and other directory backends) populate struct passwd directly and may leave fields NULL. Guard each string field and emit null instead, mirroring the existing pw/gr handling in php_posix_group_to_array().
This was referenced Jun 24, 2026
devnexen
approved these changes
Jun 24, 2026
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php_posix_passwd_to_array() passed pw_name, pw_passwd, pw_gecos, pw_dir and pw_shell straight to add_assoc_string() with no NULL guard, so a NULL string field segfaults the process via zend_string_init(). glibc's files NSS backend normalizes empty fields to the empty string, but third-party NSS modules (nss-systemd, nss-ldap, sssd and other directory backends) populate struct passwd directly and may leave fields NULL. Guard each string field and emit null instead, mirroring the existing handling already present for the group array in php_posix_group_to_array(). A deterministic test needs a non-files NSS backend returning NULL, so there is no portable red/green test; the existing group-path guard is the precedent.