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elf: Fix rtld-audit trampoline for aarch64

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This patch fixes two problems with audit:

  1. The DL_OFFSET_RV_VPCS offset was mixed up with DL_OFFSET_RG_VPCS,
     resulting in x2 register value nulling in RG structure.

  2. We need to preserve the x8 register before function call, but
     don't have to save it's new value and restore it before return.

Anyway the final restore was using OFFSET_RV instead of OFFSET_RG value
which is wrong (althoug doesn't affect anything).

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Vladislav Khmelevsky 2022-11-17 12:47:29 +04:00 committed by Adhemerval Zanella
parent a9acb7b39e
commit eb4181e9f4
1 changed files with 1 additions and 3 deletions
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4
sysdeps/aarch64/dl-trampoline.S
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@ -298,12 +298,11 @@ _dl_runtime_profile:
stp x2, x3, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*1]
stp x4, x5, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*2]
stp x6, x7, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*3]
str x8, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*4]
stp q0, q1, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*0]
stp q2, q3, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*1]
stp q4, q5, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*2]
stp q6, q7, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*3]
str xzr, [X29, #OFFSET_RV + DL_OFFSET_RG_VPCS]
str xzr, [X29, #OFFSET_RV + DL_OFFSET_RV_VPCS]
/* Setup call to pltexit */
ldp x0, x1, [x29, #OFFSET_SAVED_CALL_X0]
@ -315,7 +314,6 @@ _dl_runtime_profile:
ldp x2, x3, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*1]
ldp x4, x5, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*2]
ldp x6, x7, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*3]
ldr x8, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*4]
ldp q0, q1, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*0]
ldp q2, q3, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*1]
ldp q4, q5, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*2]