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

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

Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
This commit is contained in:
Christian Goeschel Ndjomouo
2026-04-27 13:04:43 -04:00
parent 0d6d2c9ebd
commit 81d23b58e8
1 changed files with 9 additions and 2 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);