aarch32: stop speculative execution past exception returns

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LuminaSensum / arm-trusted-firmware

Browse code aarch32: stop speculative execution past exception returns aarch32 CPUs speculatively execute instructions following a ERET as if it was not a jump instruction. This could lead to cache-based side channel vulnerabilities. The software fix is to place barrier instructions following ERET. The counterpart patch for aarch64 is merged: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=`f461fe3` Change-Id: I2aa3105bee0b92238f389830b3a3b8650f33af3d Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com> WIP_v2.3-LS master v2.4-LS v2.3-rc2 v2.3-rc1 v2.3-rc0 v2.3
1 parent 2403813 commit 6bc243825f561e87ef7af7f51b218c6b0dab9b78 Madhukar Pappireddy authored on 26 Feb 2020

Browse code

aarch32 CPUs speculatively execute instructions following a
ERET as if it was not a jump instruction. This could lead to
cache-based side channel vulnerabilities. The software fix is
to place barrier instructions following ERET.

The counterpart patch for aarch64 is merged:
https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=f461fe3

Change-Id: I2aa3105bee0b92238f389830b3a3b8650f33af3d
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>

WIP_v2.3-LS master v2.4-LS v2.3-rc2 v2.3-rc1 v2.3-rc0 v2.3

1 parent 2403813 commit 6bc243825f561e87ef7af7f51b218c6b0dab9b78

Madhukar Pappireddy authored on 26 Feb 2020

Patch

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Ignore Space Show notes View bl1/aarch32/bl1_exceptions.S

Ignore Space Show notes View bl2/aarch32/bl2_el3_entrypoint.S

Ignore Space Show notes View include/arch/aarch32/asm_macros.S

Ignore Space Show notes View include/arch/aarch32/smccc_macros.S

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