Revert "ARM: decompressor: Use Domain Manager Access permissions"

AntonioBorneo · ADESTM · commit ef955df5d4e1 · 2026-06-01T16:30:14.000+02:00
This reverts commit 9bdc9c3. The commit removes the permission checks on memory access. On Cortex-A7 this causes illegal memory accesses during the kernel decompression if an interrupt forces a switch to secure. Revert it and replace it with another implementation. Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com> Change-Id: I2cbf979a0a761bf8d12c9bb648ca2ac201788d57 Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/566410 Domain-Review: Amelie DELAUNAY <amelie.delaunay@foss.st.com> ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com> ACI: CIBUILD <MDG-smet-aci-builds@list.st.com> Reviewed-by: Amelie DELAUNAY <amelie.delaunay@foss.st.com>
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
@@ -888,7 +888,7 @@ __armv7_mmu_cache_on:
  ARM_BE8(	orr	r0, r0, #1 << 25 )	@ big-endian page tables
 		mrcne   p15, 0, r6, c2, c0, 2   @ read ttb control reg
 		orrne	r0, r0, #1		@ MMU enabled
-		movne	r1, #0xffffffff		@ domain 0 = manager
+		movne	r1, #0xfffffffd		@ domain 0 = client
 		bic     r6, r6, #1 << 31        @ 32-bit translation system
 		bic     r6, r6, #(7 << 0) | (1 << 4)	@ use only ttbr0
 		mcrne	p15, 0, r3, c2, c0, 0	@ load page table pointer
