zyppe/anolis-glibc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

update to glibc-2.28-251.2.src.rpm

Browse source 
Signed-off-by: Zhao Hang <wb-zh951434@alibaba-inc.com>
This commit is contained in:
Zhao Hang 2024-05-29 10:21:30 +08:00
parent e44d0a27bf
commit bd4ad22e2b
160 changed files with 43782 additions and 39677 deletions
Download patch file Download diff file Expand all files Collapse all files

47
glibc-RHEL-17468-1.patch Normal file
View file

@ -0,0 +1,47 @@
commit 3921c5b40f293c57cb326f58713c924b0662ef59
Author: Hector Martin <marcan@marcan.st>
Date: Tue Nov 28 15:23:07 2023 +0900
elf: Fix TLS modid reuse generation assignment (BZ 29039)
_dl_assign_tls_modid() assigns a slotinfo entry for a new module, but
does *not* do anything to the generation counter. The first time this
happens, the generation is zero and map_generation() returns the current
generation to be used during relocation processing. However, if
a slotinfo entry is later reused, it will already have a generation
assigned. If this generation has fallen behind the current global max
generation, then this causes an obsolete generation to be assigned
during relocation processing, as map_generation() returns this
generation if nonzero. _dl_add_to_slotinfo() eventually resets the
generation, but by then it is too late. This causes DTV updates to be
skipped, leading to NULL or broken TLS slot pointers and segfaults.
Fix this by resetting the generation to zero in _dl_assign_tls_modid(),
so it behaves the same as the first time a slot is assigned.
_dl_add_to_slotinfo() will still assign the correct static generation
later during module load, but relocation processing will no longer use
an obsolete generation.
Note that slotinfo entry (aka modid) reuse typically happens after a
dlclose and only TLS access via dynamic tlsdesc is affected. Because
tlsdesc is optimized to use the optional part of static TLS, dynamic
tlsdesc can be avoided by increasing the glibc.rtld.optional_static_tls
tunable to a large enough value, or by LD_PRELOAD-ing the affected
modules.
Fixes bug 29039.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
diff --git a/elf/dl-tls.c b/elf/dl-tls.c
index a21276732968d88b..c8104078b2aa0aa2 100644
--- a/elf/dl-tls.c
+++ b/elf/dl-tls.c
@@ -156,6 +156,7 @@ _dl_assign_tls_modid (struct link_map *l)
{
/* Mark the entry as used, so any dependency see it. */
atomic_store_relaxed (&runp->slotinfo[result - disp].map, l);
+ atomic_store_relaxed (&runp->slotinfo[result - disp].gen, 0);
break;
}