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From: "nsz at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/26926] New: aarch64: library dependencies are not bti protected
Date: Fri, 20 Nov 2020 11:28:35 +0000 [thread overview]
Message-ID: <bug-26926-131@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=26926
Bug ID: 26926
Summary: aarch64: library dependencies are not bti protected
Product: glibc
Version: 2.32
Status: NEW
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: nsz at gcc dot gnu.org
Target Milestone: ---
dl_open_check is only called on dlopened libraries not on
theirs dependencies, same for rtld_main_check: dependencies
are not checked.
the aarch64 backend *_check adds bti protection but it only
considers the passed linkmap, not its dependencies, so bti
protection is missing on those.
the bt VmFlag in /proc/self/smaps indicates bti protection, on
a bti enabled system it should be on all exec pages, but i see:
cat /proc/self/smaps |grep -E '(r-xp|VmFlags.*ex)'
00400000-004ff000 r-xp 00000000 00:14 10783380
/bin/busybox
VmFlags: rd ex mr mw me dw bt
fffff7d80000-fffff7edf000 r-xp 00000000 00:14 10759514
/lib64/libc-2.32.9000.so
VmFlags: rd ex mr mw me
fffff7ef7000-fffff7f0a000 r-xp 00000000 00:14 10759538
/lib64/libresolv-2.32.9000.so
VmFlags: rd ex mr mw me
fffff7f1e000-fffff7fb9000 r-xp 00000000 00:14 10759520
/lib64/libm-2.32.9000.so
VmFlags: rd ex mr mw me
fffff7fca000-fffff7fed000 r-xp 00000000 00:14 10759508
/lib64/ld-2.32.9000.so
VmFlags: rd ex mr mw me dw bt
fffff7ffc000-fffff7ffd000 r-xp 00000000 00:00 0 [vdso]
VmFlags: rd ex mr mw me de bt
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next reply other threads:[~2020-11-20 11:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 11:28 nsz at gcc dot gnu.org [this message]
2020-12-01 12:15 ` [Bug dynamic-link/26926] " nsz at gcc dot gnu.org
2020-12-11 15:19 ` cvs-commit at gcc dot gnu.org
2020-12-11 15:54 ` nsz at gcc dot gnu.org
2021-01-21 10:43 ` cvs-commit at gcc dot gnu.org
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