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shared/pager: add support for more(1) pager in secure mode (#41503)

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The more(1) pager (part of util-linux) now supports secure mode,
which can be enabled with the MORESECURE environment variable.

Adding support for more(1) in secure mode serves as an alternative
for systems that do not have less installed or for users who prefer
it.

Commit d2fce960f9cac740 introduced secure mode in more(1) and the
new feature is available in version 2.42 of util-linux.
This commit is contained in:
Lennart Poettering
2026-05-06 14:30:29 +02:00
committed by GitHub
parent f6363a0b1d df87d75038
commit e0ea854328
3 changed files with 19 additions and 9 deletions
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src/shared/pager.c
+9 -2
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@@ -206,6 +206,13 @@ void pager_open(PagerFlags flags) {
_exit(EXIT_FAILURE);
}
/* Some pager implementations support the PAGERSECURE environment variable, e.g. more(1) */
r = set_unset_env("PAGERSECURE", use_secure_mode ? "1" : NULL, true);
if (r < 0) {
log_error_errno(r, "Failed to adjust environment variable PAGERSECURE: %m");
_exit(EXIT_FAILURE);
}
if (trust_pager && pager_args) { /* The pager config might be set globally, and we cannot
* know if the user adjusted it to be appropriate for the
* secure mode. Thus, start the pager specified through
@@ -228,8 +235,8 @@ void pager_open(PagerFlags flags) {
static const char* pagers[] = { "pager", "less", "more", "(built-in)" };
for (unsigned i = 0; i < ELEMENTSOF(pagers); i++) {
/* Only less (and our trivial fallback) implement secure mode right now. */
if (use_secure_mode && !STR_IN_SET(pagers[i], "less", "(built-in)"))
/* Only less, more (and our trivial fallback) implement secure mode right now. */
if (use_secure_mode && !STR_IN_SET(pagers[i], "less", "more", "(built-in)"))
continue;
r = loop_write(exe_name_pipe[1], pagers[i], strlen(pagers[i]) + 1);