a293360273
commit 9e2e6042a7ec6504fe8e366717afa2f40cf16488 upstream. Commit 2139619bcad7 ("riscv: mmap with PROT_WRITE but no PROT_READ is invalid") made mmap() return EINVAL if PROT_WRITE was set wihtout PROT_READ with the justification that a write-only PTE is considered a reserved PTE permission bit pattern in the privileged spec. This check is unnecessary since we let VM_WRITE imply VM_READ on RISC-V, and it is inconsistent with other architectures that don't support write-only PTEs, creating a potential software portability issue. Just remove the check altogether and let PROT_WRITE imply PROT_READ as is the case on other architectures. Note that this also allows PROT_WRITE|PROT_EXEC mappings which were disallowed prior to the aforementioned commit; PROT_READ is implied in such mappings as well. Fixes: 2139619bcad7 ("riscv: mmap with PROT_WRITE but no PROT_READ is invalid") Reviewed-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Andrew Bresticker <abrestic@rivosinc.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220915193702.2201018-3-abrestic@rivosinc.com/ Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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.. | ||
vdso | ||
.gitignore | ||
asm-offsets.c | ||
cacheinfo.c | ||
cpu.c | ||
cpufeature.c | ||
entry.S | ||
ftrace.c | ||
head.S | ||
irq.c | ||
Makefile | ||
mcount-dyn.S | ||
mcount.S | ||
module-sections.c | ||
module.c | ||
module.lds | ||
perf_event.c | ||
process.c | ||
ptrace.c | ||
reset.c | ||
riscv_ksyms.c | ||
setup.c | ||
signal.c | ||
smp.c | ||
smpboot.c | ||
stacktrace.c | ||
sys_riscv.c | ||
syscall_table.c | ||
time.c | ||
traps.c | ||
vdso.c | ||
vmlinux.lds.S |