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The page pool is carved out of the PSRAM that user processes run from, and the external memory permissions are indexed by physical address, so a permanent kernel window onto the pool is a window onto every process, which no permission setting can close. Stop mapping the pool. The kernel reaches a pool page through a small scratch region instead, mapped for one operation and invalidated afterwards. esp32s3_pgmap() takes a slot, esp32s3_pgunmap() releases it, and ARCH_KMAP_VBASE and ARCH_KMAP_NPAGES describe the region. Two slots are enough, because the deepest user is up_addrenv_fork(), which holds a source and a destination page at once. Assisted-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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| .. | ||
| .gitignore | ||
| esp32s3_aliases.ld | ||
| esp32s3_peripherals.ld | ||
| esp32s3_rom_aliases.ld | ||
| esp32s3_sections.ld | ||
| esp32s3_ulp_riscv_sections.ld | ||
| flat_memory.ld | ||
| kernel-space.ld | ||
| legacy_sections.ld | ||
| mcuboot_sections.ld | ||
| protected_memory.ld | ||
| user-space.ld | ||