On Nov 12 2025, Deepak Gupta via B4 Relay wrote: > From: Deepak Gupta <[email protected]> > > `arch_calc_vm_prot_bits` is implemented on risc-v to return VM_READ | > VM_WRITE if PROT_WRITE is specified. Similarly `riscv_sys_mmap` is > updated to convert all incoming PROT_WRITE to (PROT_WRITE | PROT_READ). > This is to make sure that any existing apps using PROT_WRITE still work. > > Earlier `protection_map[VM_WRITE]` used to pick read-write PTE encodings. > Now `protection_map[VM_WRITE]` will always pick PAGE_SHADOWSTACK PTE > encodings for shadow stack. Above changes ensure that existing apps > continue to work because underneath kernel will be picking > `protection_map[VM_WRITE|VM_READ]` PTE encodings.
This breaks LTP mmap04: $ ./mmap04 tst_test.c:2042: TINFO: LTP version: 20260529.5ccf816f tst_test.c:2045: TINFO: Tested kernel: 7.0.10-5-default #1 SMP PREEMPT_DYNAMIC Sat May 23 12:09:09 UTC 2026 (bb95589) riscv64 tst_kconfig.c:90: TINFO: Parsing kernel config '/proc/config.gz' tst_kconfig.c:753: TINFO: CONFIG_FAULT_INJECTION kernel option detected which might slow the execution tst_test.c:1870: TINFO: Overall timeout per run is 0h 04m 00s mmap04.c:66: TPASS: mapping permissions in /proc matched: ---p mmap04.c:66: TPASS: mapping permissions in /proc matched: ---s mmap04.c:66: TPASS: mapping permissions in /proc matched: r--p mmap04.c:66: TPASS: mapping permissions in /proc matched: r--s mmap04.c:68: TFAIL: mapping permissions in /proc mismatched, expected: -w-p, found: rw-p mmap04.c:68: TFAIL: mapping permissions in /proc mismatched, expected: -w-s, found: rw-s mmap04.c:66: TPASS: mapping permissions in /proc matched: rw-p mmap04.c:66: TPASS: mapping permissions in /proc matched: rw-s mmap04.c:66: TPASS: mapping permissions in /proc matched: r-xp mmap04.c:66: TPASS: mapping permissions in /proc matched: r-xs mmap04.c:68: TFAIL: mapping permissions in /proc mismatched, expected: -wxp, found: rwxp mmap04.c:68: TFAIL: mapping permissions in /proc mismatched, expected: -wxs, found: rwxs mmap04.c:66: TPASS: mapping permissions in /proc matched: rwxp mmap04.c:66: TPASS: mapping permissions in /proc matched: rwxs Summary: passed 10 failed 4 broken 0 skipped 0 warnings 0 -- Andreas Schwab, [email protected] GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
