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feat: implement CVE-2024-36350 CVE-2024-36357 (Transient Scheduler Attack)

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This commit is contained in:
Stéphane Lesimple
2026-03-30 21:13:21 +02:00
parent 5a0c391b06
commit 05e09bb7f4
7 changed files with 292 additions and 2 deletions
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2
.github/workflows/expected_cve_count vendored
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@@ -1 +1 @@
19
21

2
src/libs/002_core_globals.sh
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@@ -157,6 +157,8 @@ CVE-2023-20593|ZENBLEED|zenbleed|Zenbleed, cross-process information leak
CVE-2022-40982|DOWNFALL|downfall|Downfall, gather data sampling (GDS)
CVE-2023-20569|INCEPTION|inception|Inception, return address security (RAS)
CVE-2023-23583|REPTAR|reptar|Reptar, redundant prefix issue
CVE-2024-36350|TSA_SQ|tsa|Transient Scheduler Attack - Store Queue (TSA-SQ)
CVE-2024-36357|TSA_L1|tsa|Transient Scheduler Attack - L1 (TSA-L1)
'
# Derive the supported CVE list from the registry

13
src/libs/200_cpu_affected.sh
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@@ -74,6 +74,8 @@ is_cpu_affected() {
# Zenbleed and Inception are both AMD specific, look for "is_amd" below:
affected_zenbleed=immune
affected_inception=immune
# TSA is AMD specific (Zen 3/4), look for "is_amd" below:
affected_tsa=immune
# Downfall & Reptar are Intel specific, look for "is_intel" below:
affected_downfall=immune
affected_reptar=immune
@@ -295,6 +297,16 @@ is_cpu_affected() {
affected_inception=vuln
fi
# TSA (Zen 3/4 are affected, unless CPUID says otherwise)
if [ "$cap_tsa_sq_no" = 1 ] && [ "$cap_tsa_l1_no" = 1 ]; then
# capability bits for AMD processors that explicitly state
# they're not affected to TSA-SQ and TSA-L1
# these vars are set in check_cpu()
pr_debug "is_cpu_affected: TSA_SQ_NO and TSA_L1_NO are set so not vuln to TSA"
elif [ "$cpu_family" = $((0x19)) ]; then
affected_tsa=vuln
fi
elif [ "$cpu_vendor" = CAVIUM ]; then
affected_variant3=immune
affected_variant3a=immune
@@ -455,6 +467,7 @@ is_cpu_affected() {
[ "$affected_downfall" = "immune" ] && affected_downfall=1 || affected_downfall=0
[ "$affected_inception" = "immune" ] && affected_inception=1 || affected_inception=0
[ "$affected_reptar" = "immune" ] && affected_reptar=1 || affected_reptar=0
[ "$affected_tsa" = "immune" ] && affected_tsa=1 || affected_tsa=0
affected_variantl1tf_sgx="$affected_variantl1tf"
# even if we are affected to L1TF, if there's no SGX, we're not affected to the original foreshadow
[ "$cap_sgx" = 0 ] && affected_variantl1tf_sgx=1

14
src/libs/230_util_optparse.sh
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@@ -166,7 +166,7 @@ while [ -n "${1:-}" ]; do
case "$2" in
help)
echo "The following parameters are supported for --variant (can be used multiple times):"
echo "1, 2, 3, 3a, 4, msbds, mfbds, mlpds, mdsum, l1tf, taa, mcepsc, srbds, zenbleed, downfall, inception"
echo "1, 2, 3, 3a, 4, msbds, mfbds, mlpds, mdsum, l1tf, taa, mcepsc, srbds, zenbleed, downfall, inception, reptar, tsa, tsa-sq, tsa-l1"
exit 0
;;
1)
@@ -237,6 +237,18 @@ while [ -n "${1:-}" ]; do
opt_cve_list="$opt_cve_list CVE-2023-23583"
opt_cve_all=0
;;
tsa)
opt_cve_list="$opt_cve_list CVE-2024-36350 CVE-2024-36357"
opt_cve_all=0
;;
tsa-sq)
opt_cve_list="$opt_cve_list CVE-2024-36350"
opt_cve_all=0
;;
tsa-l1)
opt_cve_list="$opt_cve_list CVE-2024-36357"
opt_cve_all=0
;;
*)
echo "$0: error: invalid parameter '$2' for --variant, see --variant help for a list" >&2
exit 255

45
src/libs/400_hw_check.sh
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@@ -963,6 +963,51 @@ check_cpu() {
fi
fi
if is_amd || is_hygon; then
pr_info " * Transient Scheduler Attacks"
pr_info_nol " * CPU indicates TSA_SQ_NO: "
cap_tsa_sq_no=''
read_cpuid 0x80000021 0x0 $ECX 1 1 1
ret=$?
if [ $ret = $READ_CPUID_RET_OK ]; then
pstatus green YES
cap_tsa_sq_no=1
elif [ $ret = $READ_CPUID_RET_KO ]; then
pstatus yellow NO
cap_tsa_sq_no=0
else
pstatus yellow UNKNOWN "$ret_read_cpuid_msg"
fi
pr_info_nol " * CPU indicates TSA_L1_NO: "
cap_tsa_l1_no=''
read_cpuid 0x80000021 0x0 $ECX 2 1 1
ret=$?
if [ $ret = $READ_CPUID_RET_OK ]; then
pstatus green YES
cap_tsa_l1_no=1
elif [ $ret = $READ_CPUID_RET_KO ]; then
pstatus yellow NO
cap_tsa_l1_no=0
else
pstatus yellow UNKNOWN "$ret_read_cpuid_msg"
fi
pr_info_nol " * CPU indicates VERW clears CPU buffers: "
cap_verw_clear=''
read_cpuid 0x80000021 0x0 $EAX 5 1 1
ret=$?
if [ $ret = $READ_CPUID_RET_OK ]; then
pstatus green YES
cap_verw_clear=1
elif [ $ret = $READ_CPUID_RET_KO ]; then
pstatus yellow NO
cap_verw_clear=0
else
pstatus yellow UNKNOWN "$ret_read_cpuid_msg"
fi
fi
pr_info_nol " * CPU supports Transactional Synchronization Extensions (TSX): "
ret=$READ_CPUID_RET_KO
cap_rtm=0

116
src/vulns/CVE-2024-36350.sh Normal file
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@@ -0,0 +1,116 @@
# vim: set ts=4 sw=4 sts=4 et:
####################
# TSA-SQ section
# CVE-2024-36350 TSA-SQ (transient scheduler attack - store queue) - entry point
check_CVE_2024_36350() {
check_cve 'CVE-2024-36350'
}
# CVE-2024-36350 TSA-SQ (transient scheduler attack - store queue) - Linux mitigation check
check_CVE_2024_36350_linux() {
local status sys_interface_available msg kernel_tsa kernel_tsa_err smt_enabled ret
status=UNK
sys_interface_available=0
msg=''
if sys_interface_check "$VULN_SYSFS_BASE/tsa"; then
# this kernel has the /sys interface, trust it over everything
sys_interface_available=1
status=$ret_sys_interface_check_status
fi
if [ "$opt_sysfs_only" != 1 ]; then
pr_info_nol "* Kernel supports TSA mitigation: "
kernel_tsa=''
kernel_tsa_err=''
if [ -n "$g_kernel_err" ]; then
kernel_tsa_err="$g_kernel_err"
# commit d8010d4ba43e: "Transient Scheduler Attacks:" is printed by tsa_select_mitigation()
elif grep -q 'Transient Scheduler Attacks' "$g_kernel"; then
kernel_tsa="found TSA mitigation message in kernel image"
fi
if [ -z "$kernel_tsa" ] && [ -r "$opt_config" ]; then
if grep -q '^CONFIG_MITIGATION_TSA=y' "$opt_config"; then
kernel_tsa="CONFIG_MITIGATION_TSA=y found in kernel config"
fi
fi
if [ -z "$kernel_tsa" ] && [ -n "$g_kernel_map" ]; then
if grep -q 'tsa_select_mitigation' "$g_kernel_map"; then
kernel_tsa="found tsa_select_mitigation in System.map"
fi
fi
if [ -n "$kernel_tsa" ]; then
pstatus green YES "$kernel_tsa"
elif [ -n "$kernel_tsa_err" ]; then
pstatus yellow UNKNOWN "$kernel_tsa_err"
else
pstatus yellow NO
fi
pr_info_nol "* CPU explicitly indicates not vulnerable to TSA-SQ (TSA_SQ_NO): "
if [ "$cap_tsa_sq_no" = 1 ]; then
pstatus green YES
elif [ "$cap_tsa_sq_no" = 0 ]; then
pstatus yellow NO
else
pstatus yellow UNKNOWN "couldn't read CPUID leaf 0x80000021"
fi
pr_info_nol "* Microcode supports VERW buffer clearing: "
if [ "$cap_verw_clear" = 1 ]; then
pstatus green YES
elif [ "$cap_verw_clear" = 0 ]; then
pstatus yellow NO
else
pstatus yellow UNKNOWN "couldn't read CPUID leaf 0x80000021"
fi
pr_info_nol "* Hyper-Threading (SMT) is enabled: "
is_cpu_smt_enabled
smt_enabled=$?
if [ "$smt_enabled" = 0 ]; then
pstatus yellow YES
else
pstatus green NO
fi
elif [ "$sys_interface_available" = 0 ]; then
# we have no sysfs but were asked to use it only!
msg="/sys vulnerability interface use forced, but it's not available!"
status=UNK
fi
if ! is_cpu_affected "$cve"; then
# override status & msg in case CPU is not vulnerable after all
pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
elif [ -z "$msg" ]; then
# if msg is empty, sysfs check didn't fill it, rely on our own test
if [ "$opt_sysfs_only" != 1 ]; then
if [ "$cap_verw_clear" = 1 ] && [ -n "$kernel_tsa" ]; then
if [ "$opt_paranoid" = 1 ] && [ "$smt_enabled" = 0 ]; then
pvulnstatus "$cve" VULN "Mitigation active but SMT must be disabled for full TSA-SQ protection"
explain "Disable SMT by adding \`nosmt\` to your kernel command line for complete protection against cross-thread TSA-SQ leakage."
else
pvulnstatus "$cve" OK "Both kernel and microcode mitigate the vulnerability"
fi
elif [ "$cap_verw_clear" = 1 ]; then
pvulnstatus "$cve" VULN "Microcode supports mitigation but kernel is too old"
explain "Update your kernel to a version that supports CONFIG_MITIGATION_TSA (Linux 6.16+),\n " \
"or check if your distribution has backported the TSA mitigation."
elif [ -n "$kernel_tsa" ]; then
pvulnstatus "$cve" VULN "Kernel supports mitigation but microcode is too old"
explain "Update your CPU microcode via a BIOS/firmware update from your OEM.\n " \
"The microcode must expose the VERW_CLEAR capability (CPUID 0x80000021 EAX bit 5)."
else
pvulnstatus "$cve" VULN "Neither kernel nor microcode mitigate the vulnerability"
explain "Both a kernel update (CONFIG_MITIGATION_TSA, Linux 6.16+) and a microcode/firmware update\n " \
"from your OEM are needed to mitigate this vulnerability."
fi
else
pvulnstatus "$cve" "$status" "$ret_sys_interface_check_fullmsg"
fi
else
pvulnstatus "$cve" "$status" "$msg"
fi
}

102
src/vulns/CVE-2024-36357.sh Normal file
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@@ -0,0 +1,102 @@
# vim: set ts=4 sw=4 sts=4 et:
####################
# TSA-L1 section
# CVE-2024-36357 TSA-L1 (transient scheduler attack - L1 cache) - entry point
check_CVE_2024_36357() {
check_cve 'CVE-2024-36357'
}
# CVE-2024-36357 TSA-L1 (transient scheduler attack - L1 cache) - Linux mitigation check
check_CVE_2024_36357_linux() {
local status sys_interface_available msg kernel_tsa kernel_tsa_err ret
status=UNK
sys_interface_available=0
msg=''
if sys_interface_check "$VULN_SYSFS_BASE/tsa"; then
# this kernel has the /sys interface, trust it over everything
sys_interface_available=1
status=$ret_sys_interface_check_status
fi
if [ "$opt_sysfs_only" != 1 ]; then
pr_info_nol "* Kernel supports TSA mitigation: "
kernel_tsa=''
kernel_tsa_err=''
if [ -n "$g_kernel_err" ]; then
kernel_tsa_err="$g_kernel_err"
# commit d8010d4ba43e: "Transient Scheduler Attacks:" is printed by tsa_select_mitigation()
elif grep -q 'Transient Scheduler Attacks' "$g_kernel"; then
kernel_tsa="found TSA mitigation message in kernel image"
fi
if [ -z "$kernel_tsa" ] && [ -r "$opt_config" ]; then
if grep -q '^CONFIG_MITIGATION_TSA=y' "$opt_config"; then
kernel_tsa="CONFIG_MITIGATION_TSA=y found in kernel config"
fi
fi
if [ -z "$kernel_tsa" ] && [ -n "$g_kernel_map" ]; then
if grep -q 'tsa_select_mitigation' "$g_kernel_map"; then
kernel_tsa="found tsa_select_mitigation in System.map"
fi
fi
if [ -n "$kernel_tsa" ]; then
pstatus green YES "$kernel_tsa"
elif [ -n "$kernel_tsa_err" ]; then
pstatus yellow UNKNOWN "$kernel_tsa_err"
else
pstatus yellow NO
fi
pr_info_nol "* CPU explicitly indicates not vulnerable to TSA-L1 (TSA_L1_NO): "
if [ "$cap_tsa_l1_no" = 1 ]; then
pstatus green YES
elif [ "$cap_tsa_l1_no" = 0 ]; then
pstatus yellow NO
else
pstatus yellow UNKNOWN "couldn't read CPUID leaf 0x80000021"
fi
pr_info_nol "* Microcode supports VERW buffer clearing: "
if [ "$cap_verw_clear" = 1 ]; then
pstatus green YES
elif [ "$cap_verw_clear" = 0 ]; then
pstatus yellow NO
else
pstatus yellow UNKNOWN "couldn't read CPUID leaf 0x80000021"
fi
elif [ "$sys_interface_available" = 0 ]; then
# we have no sysfs but were asked to use it only!
msg="/sys vulnerability interface use forced, but it's not available!"
status=UNK
fi
if ! is_cpu_affected "$cve"; then
# override status & msg in case CPU is not vulnerable after all
pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
elif [ -z "$msg" ]; then
# if msg is empty, sysfs check didn't fill it, rely on our own test
if [ "$opt_sysfs_only" != 1 ]; then
if [ "$cap_verw_clear" = 1 ] && [ -n "$kernel_tsa" ]; then
pvulnstatus "$cve" OK "Both kernel and microcode mitigate the vulnerability"
elif [ "$cap_verw_clear" = 1 ]; then
pvulnstatus "$cve" VULN "Microcode supports mitigation but kernel is too old"
explain "Update your kernel to a version that supports CONFIG_MITIGATION_TSA (Linux 6.16+),\n " \
"or check if your distribution has backported the TSA mitigation."
elif [ -n "$kernel_tsa" ]; then
pvulnstatus "$cve" VULN "Kernel supports mitigation but microcode is too old"
explain "Update your CPU microcode via a BIOS/firmware update from your OEM.\n " \
"The microcode must expose the VERW_CLEAR capability (CPUID 0x80000021 EAX bit 5)."
else
pvulnstatus "$cve" VULN "Neither kernel nor microcode mitigate the vulnerability"
explain "Both a kernel update (CONFIG_MITIGATION_TSA, Linux 6.16+) and a microcode/firmware update\n " \
"from your OEM are needed to mitigate this vulnerability."
fi
else
pvulnstatus "$cve" "$status" "$ret_sys_interface_check_fullmsg"
fi
else
pvulnstatus "$cve" "$status" "$msg"
fi
}