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| author | DJ Delorie <dj@redhat.com> | 2021-01-15 19:50:00 -0500 |
|---|---|---|
| committer | DJ Delorie <dj@redhat.com> | 2021-01-27 13:35:15 -0500 |
| commit | 429029a73ec2dba7f808f69ec8b9e3d84e13e804 (patch) | |
| tree | cfe71d0e361692d5aabff4d8eaa00f2638f69fe4 /nss/nss_module.c | |
| parent | 01cdcf783a666481133d4975b1980624b0ef4799 (diff) | |
| download | glibc-429029a73ec2dba7f808f69ec8b9e3d84e13e804.tar.gz glibc-429029a73ec2dba7f808f69ec8b9e3d84e13e804.tar.xz glibc-429029a73ec2dba7f808f69ec8b9e3d84e13e804.zip | |
nsswitch: do not reload if "/" changes
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>
Diffstat (limited to 'nss/nss_module.c')
| -rw-r--r-- | nss/nss_module.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/nss/nss_module.c b/nss/nss_module.c index 1a9359930d..6c5f341f3e 100644 --- a/nss/nss_module.c +++ b/nss/nss_module.c @@ -349,6 +349,19 @@ __nss_disable_nscd (void (*cb) (size_t, struct traced_file *)) } #endif +/* Block attempts to dlopen any module we haven't already opened. */ +void +__nss_module_disable_loading (void) +{ + __libc_lock_lock (nss_module_list_lock); + + for (struct nss_module *p = nss_module_list; p != NULL; p = p->next) + if (p->state == nss_module_uninitialized) + p->state = nss_module_failed; + + __libc_lock_unlock (nss_module_list_lock); +} + void __libc_freeres_fn_section __nss_module_freeres (void) { |