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254 lines
8.2 KiB
254 lines
8.2 KiB
commit 66e9d27a090874ab93030a908eb86fc29f856151 |
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> |
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Date: Tue Jul 20 11:03:34 2021 -0300 |
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elf: Add _dl_audit_activity_map and _dl_audit_activity_nsid |
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It consolidates the code required to call la_activity audit |
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callback. |
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Also for a new Lmid_t the namespace link_map list are empty, so it |
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requires to check if before using it. This can happen for when audit |
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module is used along with dlmopen. |
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Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. |
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Reviewed-by: Florian Weimer <fweimer@redhat.com> |
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(cherry picked from commit 3dac3959a5cb585b065cef2cb8a8d909c907e202) |
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diff --git a/elf/dl-audit.c b/elf/dl-audit.c |
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index 4066dfe85146b9d4..74b87f4b39be75e1 100644 |
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--- a/elf/dl-audit.c |
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+++ b/elf/dl-audit.c |
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@@ -18,6 +18,32 @@ |
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#include <ldsodefs.h> |
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+void |
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+_dl_audit_activity_map (struct link_map *l, int action) |
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+{ |
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+ struct audit_ifaces *afct = GLRO(dl_audit); |
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+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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+ { |
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+ if (afct->activity != NULL) |
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+ afct->activity (&link_map_audit_state (l, cnt)->cookie, action); |
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+ afct = afct->next; |
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+ } |
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+} |
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+ |
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+void |
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+_dl_audit_activity_nsid (Lmid_t nsid, int action) |
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+{ |
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+ /* If head is NULL, the namespace has become empty, and the audit interface |
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+ does not give us a way to signal LA_ACT_CONSISTENT for it because the |
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+ first loaded module is used to identify the namespace. */ |
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+ struct link_map *head = GL(dl_ns)[nsid]._ns_loaded; |
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+ if (__glibc_likely (GLRO(dl_naudit) == 0) |
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+ || head == NULL || head->l_auditing) |
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+ return; |
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+ |
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+ _dl_audit_activity_map (head, action); |
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+} |
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+ |
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void |
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_dl_audit_objopen (struct link_map *l, Lmid_t nsid) |
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{ |
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diff --git a/elf/dl-close.c b/elf/dl-close.c |
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index f6fbf9de7d78555b..5a8cc9e7cb5186cc 100644 |
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--- a/elf/dl-close.c |
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+++ b/elf/dl-close.c |
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@@ -472,25 +472,7 @@ _dl_close_worker (struct link_map *map, bool force) |
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#ifdef SHARED |
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/* Auditing checkpoint: we will start deleting objects. */ |
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- if (__glibc_unlikely (do_audit)) |
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- { |
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- struct link_map *head = ns->_ns_loaded; |
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- struct audit_ifaces *afct = GLRO(dl_audit); |
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- /* Do not call the functions for any auditing object. */ |
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- if (head->l_auditing == 0) |
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- { |
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- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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- { |
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- if (afct->activity != NULL) |
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- { |
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- struct auditstate *state = link_map_audit_state (head, cnt); |
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- afct->activity (&state->cookie, LA_ACT_DELETE); |
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- } |
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- |
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- afct = afct->next; |
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- } |
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- } |
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- } |
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+ _dl_audit_activity_nsid (nsid, LA_ACT_DELETE); |
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#endif |
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/* Notify the debugger we are about to remove some loaded objects. */ |
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@@ -785,32 +767,9 @@ _dl_close_worker (struct link_map *map, bool force) |
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__rtld_lock_unlock_recursive (GL(dl_load_tls_lock)); |
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#ifdef SHARED |
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- /* Auditing checkpoint: we have deleted all objects. */ |
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- if (__glibc_unlikely (do_audit)) |
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- { |
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- struct link_map *head = ns->_ns_loaded; |
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- /* If head is NULL, the namespace has become empty, and the |
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- audit interface does not give us a way to signal |
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- LA_ACT_CONSISTENT for it because the first loaded module is |
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- used to identify the namespace. |
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- |
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- Furthermore, do not notify auditors of the cleanup of a |
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- failed audit module loading attempt. */ |
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- if (head != NULL && head->l_auditing == 0) |
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- { |
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- struct audit_ifaces *afct = GLRO(dl_audit); |
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- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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- { |
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- if (afct->activity != NULL) |
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- { |
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- struct auditstate *state = link_map_audit_state (head, cnt); |
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- afct->activity (&state->cookie, LA_ACT_CONSISTENT); |
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- } |
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- |
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- afct = afct->next; |
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- } |
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- } |
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- } |
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+ /* Auditing checkpoint: we have deleted all objects. Also, do not notify |
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+ auditors of the cleanup of a failed audit module loading attempt. */ |
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+ _dl_audit_activity_nsid (nsid, LA_ACT_CONSISTENT); |
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#endif |
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if (__builtin_expect (ns->_ns_loaded == NULL, 0) |
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diff --git a/elf/dl-load.c b/elf/dl-load.c |
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index a2d73d025c65cd79..baf0a926053deaed 100644 |
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--- a/elf/dl-load.c |
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+++ b/elf/dl-load.c |
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@@ -1482,24 +1482,8 @@ cannot enable executable stack as shared object requires"); |
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/* Auditing checkpoint: we are going to add new objects. Since this |
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is called after _dl_add_to_namespace_list the namespace is guaranteed |
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to not be empty. */ |
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- if ((mode & __RTLD_AUDIT) == 0 |
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- && __glibc_unlikely (GLRO(dl_naudit) > 0)) |
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- { |
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- struct link_map *head = GL(dl_ns)[nsid]._ns_loaded; |
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- /* Do not call the functions for any auditing object. */ |
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- if (head->l_auditing == 0) |
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- { |
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- struct audit_ifaces *afct = GLRO(dl_audit); |
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- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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- { |
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- if (afct->activity != NULL) |
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- afct->activity (&link_map_audit_state (head, cnt)->cookie, |
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- LA_ACT_ADD); |
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- |
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- afct = afct->next; |
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- } |
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- } |
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- } |
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+ if ((mode & __RTLD_AUDIT) == 0) |
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+ _dl_audit_activity_nsid (nsid, LA_ACT_ADD); |
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#endif |
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/* Notify the debugger we have added some objects. We need to |
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diff --git a/elf/dl-open.c b/elf/dl-open.c |
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index bc68e2c376debd71..3f01aa480730da13 100644 |
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--- a/elf/dl-open.c |
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+++ b/elf/dl-open.c |
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@@ -611,25 +611,7 @@ dl_open_worker_begin (void *a) |
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#ifdef SHARED |
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/* Auditing checkpoint: we have added all objects. */ |
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- if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
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- { |
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- struct link_map *head = GL(dl_ns)[new->l_ns]._ns_loaded; |
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- /* Do not call the functions for any auditing object. */ |
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- if (head->l_auditing == 0) |
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- { |
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- struct audit_ifaces *afct = GLRO(dl_audit); |
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- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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- { |
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- if (afct->activity != NULL) |
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- { |
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- struct auditstate *state = link_map_audit_state (head, cnt); |
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- afct->activity (&state->cookie, LA_ACT_CONSISTENT); |
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- } |
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- |
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- afct = afct->next; |
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- } |
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- } |
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- } |
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+ _dl_audit_activity_nsid (new->l_ns, LA_ACT_CONSISTENT); |
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#endif |
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/* Notify the debugger all new objects are now ready to go. */ |
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diff --git a/elf/rtld.c b/elf/rtld.c |
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index 45fec0df3043b90a..b6bb46ca97b7972f 100644 |
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--- a/elf/rtld.c |
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+++ b/elf/rtld.c |
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@@ -1804,18 +1804,7 @@ dl_main (const ElfW(Phdr) *phdr, |
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/* Auditing checkpoint: we are ready to signal that the initial map |
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is being constructed. */ |
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- if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
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- { |
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- struct audit_ifaces *afct = GLRO(dl_audit); |
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- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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- { |
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- if (afct->activity != NULL) |
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- afct->activity (&link_map_audit_state (main_map, cnt)->cookie, |
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- LA_ACT_ADD); |
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- |
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- afct = afct->next; |
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- } |
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- } |
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+ _dl_audit_activity_map (main_map, LA_ACT_ADD); |
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/* We have two ways to specify objects to preload: via environment |
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variable and via the file /etc/ld.so.preload. The latter can also |
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@@ -2496,23 +2485,7 @@ dl_main (const ElfW(Phdr) *phdr, |
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#ifdef SHARED |
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/* Auditing checkpoint: we have added all objects. */ |
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- if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
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- { |
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- struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded; |
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- /* Do not call the functions for any auditing object. */ |
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- if (head->l_auditing == 0) |
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- { |
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- struct audit_ifaces *afct = GLRO(dl_audit); |
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- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) |
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- { |
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- if (afct->activity != NULL) |
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- afct->activity (&link_map_audit_state (head, cnt)->cookie, |
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- LA_ACT_CONSISTENT); |
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- |
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- afct = afct->next; |
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- } |
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- } |
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- } |
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+ _dl_audit_activity_nsid (LM_ID_BASE, LA_ACT_CONSISTENT); |
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#endif |
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/* Notify the debugger all new objects are now ready to go. We must re-get |
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diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h |
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index 5709e4e48dff4355..7384abcf5e0e8e24 100644 |
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--- a/sysdeps/generic/ldsodefs.h |
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+++ b/sysdeps/generic/ldsodefs.h |
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@@ -1373,6 +1373,16 @@ link_map_audit_state (struct link_map *l, size_t index) |
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} |
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} |
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+/* Call the la_activity from the audit modules from the link map L and issues |
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+ the ACTION argument. */ |
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+void _dl_audit_activity_map (struct link_map *l, int action) |
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+ attribute_hidden; |
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+ |
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+/* Call the la_activity from the audit modules from the link map from the |
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+ namespace NSID and issues the ACTION argument. */ |
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+void _dl_audit_activity_nsid (Lmid_t nsid, int action) |
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+ attribute_hidden; |
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+ |
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/* Call the la_objopen from the audit modules for the link_map L on the |
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namespace identification NSID. */ |
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void _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
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