Palmer Dabbelt 8aeb7b17f0 RISC-V: Make mmap() with PROT_WRITE imply PROT_READ ... Commit 2139619bca ("riscv: mmap with PROT_WRITE but no PROT_READ is invalid") made mmap() reject mappings with only PROT_WRITE set in an attempt to fix an observed inconsistency in behavior when attempting to read from a PROT_WRITE-only mapping. The root cause of this behavior was actually that while RISC-V's protection_map maps VM_WRITE to readable PTE permissions (since write-only PTEs are considered reserved by the privileged spec), the page fault handler considered loads from VM_WRITE-only VMAs illegal accesses. Fix the underlying cause by handling faults in VM_WRITE-only VMAs (patch 1) and then re-enable use of mmap(PROT_WRITE) (patch 2), making RISC-V's behavior consistent with all other architectures that don't support write-only PTEs. * remotes/palmer/riscv-wonly: riscv: Allow PROT_WRITE-only mmap() riscv: Make VM_WRITE imply VM_READ Link: https://lore.kernel.org/r/20220915193702.2201018-1-abrestic@rivosinc.com/ Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2022-10-13 12:49:12 -07:00
..
boot	Microchip RISC-V devicetrees for v6.1	2022-10-12 14:59:54 -07:00
configs	riscv: enable CD-ROM file systems in defconfig	2022-08-25 17:01:09 -07:00
errata	Merge patch series "Some style cleanups for recent extension additions"	2022-10-13 08:46:31 -07:00
include	riscv: vdso: fix NULL deference in vdso_join_timens() when vfork	2022-10-13 11:16:52 -07:00
kernel	RISC-V: Make mmap() with PROT_WRITE imply PROT_READ	2022-10-13 12:49:12 -07:00
kvm	The first batch of KVM patches, mostly covering x86, which I	2022-10-09 09:39:55 -07:00
lib	riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit	2022-08-10 14:06:31 -07:00
mm	RISC-V: Make mmap() with PROT_WRITE imply PROT_READ	2022-10-13 12:49:12 -07:00
net	bpf, riscv: Support riscv jit to provide bpf_line_info	2022-06-02 16:26:01 -07:00
purgatory	riscv/purgatory: Omit use of bin2c	2022-08-11 09:32:34 -07:00
Kbuild	riscv: move errata/ and kvm/ builds to arch/riscv/Kbuild	2022-06-01 22:26:32 -07:00
Kconfig	riscv: enable software resend of irqs	2022-10-13 11:28:01 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: make t-head erratas depend on MMU	2022-09-17 01:48:22 -07:00
Kconfig.socs	riscv: Kconfig: Style cleanups	2022-06-30 19:26:16 -07:00
Makefile	riscv: Pass -mno-relax only on lld < 15.0.0	2022-10-13 08:24:34 -07:00