Control: reassign -1 initramfs-tools 0.135 Am 13.09.19 um 11:54 schrieb Mikulas Patocka: > Package: udev > Version: 242-7 > Severity: normal > > Dear Maintainer, > > *** Reporter, please consider answering these questions, where appropriate *** > > * What led up to the situation? > > I use the uvesafb framebuffer, that uses a helper process v86d that > emulates 8086 BIOS to change video modes. > > * What exactly did you do (or not do) that was effective (or > ineffective)? > > After some recent udev update, udev sets the "noexec" flag on the /dev/ > filesystem. It breaks programs that want to map devices with PROT_EXEC, > such as v86d. uvesafb doesn't work, because v86d can't map memory with the > PROT_EXEC flag. > > if I do "mount -o remount,exec /dev", v86d starts normally and uvesafb > works. > > * What was the outcome of this action? > > The vm86d program fails with this error: > > openat(AT_FDCWD, "/dev/zero", O_RDWR) = 4 > mmap(0x1000, 655360, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0) = -1 EPERM (Operace není povolena) > dup(2) = 5 > fcntl(5, F_GETFL) = 0x8001 (flags O_WRONLY|O_LARGEFILE) > close(5) = 0 > write(2, "mmap /dev/zero: Operation not pe"..., 40mmap /dev/zero: Operation not permitted > ) = 40 > close(4) = 0 > ioperm(0, 0x400, 1) = 0 > iopl(3) = 0 > exit_group(-1) = ? > > * What outcome did you expect instead? > > The mmap syscall should succeed: > > openat(AT_FDCWD, "/dev/zero", O_RDWR) = 4 > mmap(0x1000, 655360, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0) = 0x1000 > close(4) = 0 > openat(AT_FDCWD, "/dev/mem", O_RDWR) = 4 > mmap(NULL, 1282, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0) = 0 > mmap(0xa0000, 393216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0xa0000) = 0xa0000 > close(4) = 0 > ioperm(0, 0x400, 1) = 0 > iopl(3) = 0 > > Afaics this is a recent initramfs-tools change: initramfs-tools (0.135) unstable; urgency=medium [ Topi Miettinen ] * [eb98d2e] init: /dev can be noexec and /run nodev https://salsa.debian.org/kernel-team/initramfs-tools/merge_requests/9 systemd mounts /dev with the following flags: https://github.com/systemd/systemd/blob/master/src/core/mount-setup.c#L66 -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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