linux-kernel - [PATCH -fixes 0/2] Fix WX mappings in the linear mapping after module unloading

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Message-Id: <20231213134027.155327-1-alexghiti@rivosinc.com>
Date:   Wed, 13 Dec 2023 14:40:25 +0100
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Vincent Chen <vincent.chen@...ive.com>,
        Zong Li <zong.li@...ive.com>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH -fixes 0/2] Fix WX mappings in the linear mapping after module unloading

I fell onto a bunch of WX mappings in the linear mapping after a module
gets unloaded, this is because our module_alloc() does not set the
VM_FLUSH_RESET_PERMS flag (patch 1) and that
set_direct_map_default_noflush() must clean the X bit (patch 2).

Note that the Fixes tags are correct but patch 2 will fail to apply
since a change in this function just landed in 6.7.

Alexandre Ghiti (2):
  riscv: Fix module_alloc() that did not reset the linear mapping
    permissions
  riscv: Fix set_direct_map_default_noflush() to reset _PAGE_EXEC

 arch/riscv/kernel/module.c | 3 ++-
 arch/riscv/mm/pageattr.c   | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

-- 
2.39.2