Description: Sharing of branch predictor selectors in same context on Intel CPUs
References:
 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00598.html
 https://github.com/vusec/bhi-spectre-bhb
Notes:
 bwh> A.k.a. "Spectre BHB".  Details to be published in INTEL-SA-00598.
 bwh> Unprivileged eBPF must also be disabled
 bwh> (CONFIG_BPF_UNPRIV_DEFAULT_OFF=y).
Bugs:
upstream: released (5.17-rc8) [d45476d9832409371537013ebdd8dc1a7781f97a, 1e19da8522c81bf46b335f84137165741e0d82b7, 5ad3eb1132453b9795ce5fd4572b1c18b292cca9, 44a3918c8245ab10c6c9719dd12e7a8d291980d8, 244d00b5dd4755f8df892c86cab35fb2cfd4f14b, e9b6013a7ce31535b04b02ba99babefe8a8599fa, eafd987d4a82c7bb5aa12f0e3b4f8f3dea93e678, 0de05d056afdb00eca8c7bbb0c79a3438daf700c]
5.10-upstream-stable: released (5.10.105) [f38774bb6e231d647d40ceeb8ddf9082eabde667, a6a119d647ad1f73067d3cffb43104df3f920bcc, 071e8b69d7808d96f388d7c5ed606e75fd3d518d, afc2d635b5e18e2b33116d8e121ee149882e33eb, 2fdf67a1d215574c31b1a716f80fa0fdccd401d7, e335384560d1e106b609e8febd7e0427075a8938, cc9e3e55bde71b2fac1494f503d5ffc560c7fb8d, d04937ae94903087279e4a016b7741cdee59d521]
4.19-upstream-stable: released (4.19.234) [25440a8c77dd2fde6a8e9cfc0c616916febf408e, 3f66bedb96ff4c064a819e68499f79b38297ba26, 7af95ef3ec6248696300fce5c68f6c8c4f50e4a4, 995629e1d8e6751936c6e2b738f70b392b0461de, d3cb3a6927222268a10b2f12dfb8c9444f7cc39e, c034d344e733a3ac574dd09e39e911a50025c607, 8bfdba77595aee5c3e83ed1c9994c35d6d409605, 9711b12a3f4c0fc73dd257c1e467e6e42155a5f1]
4.9-upstream-stable: released (4.9.306) [a771511caa8e31cb5cac4fa39165ebbca3e62795, d0ba50275860b456ff570edf3dcc2db5d2eb9eb8, f9238d33710d74ac3dd668abaa53b2274f8e6fe6, 6481835a9a5b74e349e5c20ae8a9cb10a2e907fa, b6a1aec08a84ccb331ce526c051df074150cf3c5, 0db1c4307aded2c5e618654f9341a249e0c1051f, 8edabefdc13294a9b15671937d165b948cf34d69, 0753760184745250e39018bb25ba77557390fe91]
sid: released (5.16.12-1) [bugfix/x86/bhb/0001-x86-speculation-Rename-RETPOLINE_AMD-to-RETPOLINE_LF.patch, bugfix/x86/bhb/0002-x86-speculation-Add-eIBRS-Retpoline-options.patch, bugfix/x86/bhb/0003-Documentation-hw-vuln-Update-spectre-doc.patch, bugfix/x86/bhb/0004-x86-speculation-Include-unprivileged-eBPF-status-in-.patch, bugfix/x86/bhb/0005-x86-speculation-Use-generic-retpoline-by-default-on-.patch, bugfix/x86/bhb/0006-x86-speculation-Update-link-to-AMD-speculation-white.patch, bugfix/x86/bhb/0007-x86-speculation-Warn-about-Spectre-v2-LFENCE-mitigat.patch, bugfix/x86/bhb/0008-x86-speculation-Warn-about-eIBRS-LFENCE-Unprivileged.patch]
5.10-bullseye-security: released (5.10.103-1) [bugfix/x86/bhb/0002-x86-speculation-Rename-RETPOLINE_AMD-to-RETPOLINE_LF.patch, bugfix/x86/bhb/0003-x86-speculation-Add-eIBRS-Retpoline-options.patch, bugfix/x86/bhb/0004-Documentation-hw-vuln-Update-spectre-doc.patch, bugfix/x86/bhb/0005-x86-speculation-Include-unprivileged-eBPF-status-in-.patch, bugfix/x86/bhb/0006-x86-speculation-Use-generic-retpoline-by-default-on-.patch, bugfix/x86/bhb/0007-x86-speculation-Update-link-to-AMD-speculation-white.patch, bugfix/x86/bhb/0008-x86-speculation-Warn-about-Spectre-v2-LFENCE-mitigat.patch, bugfix/x86/bhb/0009-x86-speculation-Warn-about-eIBRS-LFENCE-Unprivileged.patch]
4.19-buster-security: released (4.19.232-1) [bugfix/x86/bhb/0004-x86-speculation-Rename-RETPOLINE_AMD-to-RETPOLINE_LF.patch, bugfix/x86/bhb/0005-x86-speculation-Add-eIBRS-Retpoline-options.patch, bugfix/x86/bhb/0006-Documentation-hw-vuln-Update-spectre-doc.patch, bugfix/x86/bhb/0007-x86-speculation-Include-unprivileged-eBPF-status-in-.patch, bugfix/x86/bhb/0008-x86-speculation-Use-generic-retpoline-by-default-on-.patch, bugfix/x86/bhb/0009-x86-speculation-Update-link-to-AMD-speculation-white.patch, bugfix/x86/bhb/0010-x86-speculation-Warn-about-Spectre-v2-LFENCE-mitigat.patch, bugfix/x86/bhb/0011-x86-speculation-Warn-about-eIBRS-LFENCE-Unprivileged.patch]
4.9-stretch-security: released (4.9.303-1) [bugfix/x86/bhb/0004-x86-speculation-Rename-RETPOLINE_AMD-to-RETPOLINE_LF.patch, bugfix/x86/bhb/0005-x86-speculation-Add-eIBRS-Retpoline-options.patch, bugfix/x86/bhb/0006-Documentation-hw-vuln-Update-spectre-doc.patch, bugfix/x86/bhb/0007-x86-speculation-Include-unprivileged-eBPF-status-in-.patch, bugfix/x86/bhb/0008-x86-speculation-Use-generic-retpoline-by-default-on-.patch, bugfix/x86/bhb/0009-x86-speculation-Update-link-to-AMD-speculation-white.patch, bugfix/x86/bhb/0010-x86-speculation-Warn-about-Spectre-v2-LFENCE-mitigat.patch, bugfix/x86/bhb/0011-x86-speculation-Warn-about-eIBRS-LFENCE-Unprivileged.patch]