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nsswitch: do not reload if "/" changes

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https://sourceware.org/bugzilla/show_bug.cgi?id=27077

Before reloading nsswitch.conf, verify that the root directory
hasn't changed - if it has, it's likely that we've entered a
container and should not trust the nsswitch inside the container
nor load any shared objects therein.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
DJ Delorie
2021-01-15 19:50:00 -05:00
parent 01cdcf783a
commit 429029a73e
9 changed files with 178 additions and 1 deletions
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3
nss/nss_module.h
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@ -87,6 +87,9 @@ bool __nss_module_load (struct nss_module *module) attribute_hidden;
void *__nss_module_get_function (struct nss_module *module, const char *name)
attribute_hidden;
/* Block attempts to dlopen any module we haven't already opened. */
void __nss_module_disable_loading (void);
/* Called from __libc_freeres. */
void __nss_module_freeres (void) attribute_hidden;