On Wed, 2025-01-15 at 15:36 +0100, Arusekk via wrote: > This commit adds support for the `prctl(PR_SET_SYSCALL_DISPATCH)` > function in the Linux userspace emulator.
Typo: this should be PR_SET_SYSCALL_USER_DISPATCH. > It is implemented as a fully host-independent function, by forcing a > SIGSYS early during syscall handling, if the PC is outside the > allowed > range. > > Tested on [uglendix][1], will probably also apply to recent versions > of > Wine that use syscall dispatch. > > [1]: https://sr.ht/~arusekk/uglendix > > Signed-off-by: Arusekk <fl...@arusekk.pl> > --- > linux-user/main.c | 2 ++ > linux-user/qemu.h | 5 +++ > linux-user/syscall.c | 64 > ++++++++++++++++++++++++++++++++++++++- > linux-user/syscall_defs.h | 6 ++++ > 4 files changed, 76 insertions(+), 1 deletion(-) [...] > @@ -13852,12 +13886,34 @@ static abi_long do_syscall1(CPUArchState > *cpu_env, int num, abi_long arg1, > return ret; > } > > +static bool sys_dispatch(abi_ulong pc, TaskState *ts) > +{ What about this line from the kernel implementation? if (unlikely(arch_syscall_is_vdso_sigreturn(regs))) return false; I think qemu's vdso implements sigreturn, e.g., in linux-user/arm/vdso.S. [...]
