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MdePkg/BaseLib: Fix invalid memory access in AArch64 SetJump/LongJump

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Correct the memory offsets used in REG_ONE/REG_PAIR macros to
synchronize them with definition of the BASE_LIBRARY_JUMP_BUFFER
structure on AArch64.

The REG_ONE macro declares only a single 64-bit register be
read/written; however, the subsequent offset is 16 bytes larger,
creating an unused memory gap in the middle of the structure and
causing SetJump/LongJump functions to read/write 8 bytes of memory
past the end of the jump buffer struct.

Signed-off-by: Jan Bobek <jbobek@nvidia.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
This commit is contained in:
Jan Bobek
2020-10-02 00:15:07 +08:00
committed by mergify[bot]
parent b65afdde74
commit 9380177354
2 changed files with 8 additions and 8 deletions
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8
MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S
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@@ -20,10 +20,10 @@ GCC_ASM_EXPORT(InternalLongJump)
REG_ONE (x16, 96) /*IP0*/
#define FPR_LAYOUT \
REG_PAIR ( d8, d9, 112); \
REG_PAIR (d10, d11, 128); \
REG_PAIR (d12, d13, 144); \
REG_PAIR (d14, d15, 160);
REG_PAIR ( d8, d9, 104); \
REG_PAIR (d10, d11, 120); \
REG_PAIR (d12, d13, 136); \
REG_PAIR (d14, d15, 152);
#/**
# Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#