aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um
Commit message (Collapse)AuthorAgeFilesLines
* um: Fix FD copy size in os_rcv_fd_msg()Tiwei Bie2025-09-101-1/+1
| | | | | | | | | When copying FDs, the copy size should not include the control message header (cmsghdr). Fix it. Fixes: 5cde6096a4dd ("um: generalize os_rcv_fd") Signed-off-by: Tiwei Bie <[email protected]> Signed-off-by: Johannes Berg <[email protected]>
* um: virtio_uml: Fix use-after-free after put_device in probeMiaoqian Lin2025-09-101-2/+4
| | | | | | | | | | | When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues. Fixes: 04e5b1fb0183 ("um: virtio: Remove device on disconnect") Signed-off-by: Miaoqian Lin <[email protected]> Signed-off-by: Johannes Berg <[email protected]>
* um: Don't mark stack executableRichard Weinberger2025-09-101-2/+1
| | | | | | | | | | | | | | On one of my machines UML failed to start after enabling SELinux. UML failed to start because SELinux's execmod rule denies executable pages on a modified file mapping. Historically UML marks it's stack rwx. AFAICT, these days this is no longer needed, so let's remove PROT_EXEC. Signed-off-by: Richard Weinberger <[email protected]> Signed-off-by: Johannes Berg <[email protected]>
* Merge tag 'uml-for-linux-6.17-rc1' of ↵Linus Torvalds2025-07-3022-90/+148
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull uml updates from Johannes Berg: "Mostly cleanups, except: - dynamic addition of vfio passthrough devices - implementation of HAVE_SYSCALL_TRACEPOINTS" * tag 'uml-for-linux-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: Replace __ASSEMBLY__ with __ASSEMBLER__ in the usermode headers um: Stop tracking stub's PID via userspace_pid[] um: Remove the pid parameter of handle_trap() um: Use err consistently in userspace() um: vfio: Support adding devices via mconsole um: rtc: Avoid shadowing err in uml_rtc_start() um: Avoid redefining ARCH_HAS_CACHE_LINE_SIZE um: Make mm_list and mm_list_lock static um: Make unscheduled_userspace_iterations static um: Re-evaluate thread flags repeatedly um: simplify syscall header files um/ptrace: Implement HAVE_SYSCALL_TRACEPOINTS um/x86: Add system call table to header file um: virt-pci: Switch to msi_create_parent_irq_domain() um: virtio_pcidev: Rename UM_PCI_STAT_WAITING
| * um: Replace __ASSEMBLY__ with __ASSEMBLER__ in the usermode headersThomas Huth2025-07-226-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, so let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: Richard Weinberger <[email protected]> Cc: Anton Ivanov <[email protected]> Cc: Johannes Berg <[email protected]> Cc: [email protected] Signed-off-by: Thomas Huth <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Stop tracking stub's PID via userspace_pid[]Tiwei Bie2025-07-136-25/+7
| | | | | | | | | | | | | | | | | | | | The PID of the stub process can be obtained from current_mm_id(). There is no need to track it via userspace_pid[]. Stop doing that to simplify the code. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Remove the pid parameter of handle_trap()Tiwei Bie2025-07-131-2/+2
| | | | | | | | | | | | | | | | It's no longer used. Remove it. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Use err consistently in userspace()Tiwei Bie2025-07-131-7/+6
| | | | | | | | | | | | | | | | | | | | Avoid declaring a new variable 'ret' inside the 'if (using_seccomp)' block, as the existing 'err' variable declared at the top of the function already serves the same purpose. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: vfio: Support adding devices via mconsoleTiwei Bie2025-07-111-5/+57
| | | | | | | | | | | | | | | | | | | | | | | | It can be used when we want to pass through PCI devices to UML while it's up and running. PCI devices can be passed through to UML using the same syntax as the command line option: (mconsole) config vfio_uml.device=<domain:bus:slot.function> Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: rtc: Avoid shadowing err in uml_rtc_start()Tiwei Bie2025-07-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | Remove the declaration of 'err' inside the 'if (timetravel)' block, as it would otherwise be unavailable outside that block, potentially leading to uml_rtc_start() returning an uninitialized value. Fixes: dde8b58d5127 ("um: add a pseudo RTC") Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Avoid redefining ARCH_HAS_CACHE_LINE_SIZETiwei Bie2025-07-111-3/+1
| | | | | | | | | | | | | | | | | | | | There is a generic ARCH_HAS_CACHE_LINE_SIZE option introduced by commit c2280be81de4 ("mm: generalize ARCH_HAS_CACHE_LINE_SIZE") in mm/Kconfig. Select that instead. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Make mm_list and mm_list_lock staticTiwei Bie2025-07-111-2/+2
| | | | | | | | | | | | | | | | They are only used within mmu.c. Make them static. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Make unscheduled_userspace_iterations staticTiwei Bie2025-07-111-1/+1
| | | | | | | | | | | | | | | | It's only used within process.c. Make it static. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: Re-evaluate thread flags repeatedlyThomas Weißschuh2025-07-112-7/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | The thread flags may change during their processing. For example a task_work can queue a new signal to be sent. This signal should be delivered before returning to usespace again. Evaluate the flags repeatedly similar to other architectures. Signed-off-by: Thomas Weißschuh <[email protected]> Reviewed-by: Nam Cao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * um: simplify syscall header filesJohannes Berg2025-07-111-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | Since Thomas's recent commit 2af10530639b ("um/x86: Add system call table to header file") , we now have two extern declarations of the syscall table, one internal and one external, and they don't even match on 32-bit. Clean this up and remove all the extra code. Reviewed-by: Thomas Weißschuh <[email protected]> Link: https://patch.msgid.link/20250704141243.a68366f6acc3.If8587a4aafdb90644fc6d0b2f5e31a2d1887915f@changeid Signed-off-by: Johannes Berg <[email protected]>
| * um/ptrace: Implement HAVE_SYSCALL_TRACEPOINTSThomas Weißschuh2025-07-113-0/+12
| | | | | | | | | | | | | | | | | | Implement syscall tracepoints through the generic tracing infrastructure. Signed-off-by: Thomas Weißschuh <[email protected]> Reviewed-by: Nam Cao <[email protected]> Link: https://patch.msgid.link/20250703-uml-have_syscall_tracepoints-v1-2-23c1d3808578@linutronix.de Signed-off-by: Johannes Berg <[email protected]>
| * um: virt-pci: Switch to msi_create_parent_irq_domain()Nam Cao2025-07-112-22/+22
| | | | | | | | | | | | | | | | | | | | | | Move away from the legacy MSI domain setup, switch to use msi_create_parent_irq_domain(). Signed-off-by: Nam Cao <[email protected]> Acked-by: Johannes Berg <[email protected]> Tested-by: Johannes Berg <[email protected]> Link: https://patch.msgid.link/5f0bd8e877e7bfdfb1a7e99d6b126caf6a7eea48.1751266049.git.namcao@linutronix.de Signed-off-by: Johannes Berg <[email protected]>
| * um: virtio_pcidev: Rename UM_PCI_STAT_WAITINGTiwei Bie2025-07-041-4/+4
| | | | | | | | | | | | | | | | | | | | Rename it to VIRTIO_PCIDEV_STAT_WAITING to make the code slightly more consistent. It was missed when refactoring virtio_pcidev into a separate module. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
* | Merge tag 'pull-headers_param' of ↵Linus Torvalds2025-07-281-1/+0
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull asm/param cleanup from Al Viro: "This massages asm/param.h to simpler and more uniform shape: - all arch/*/include/uapi/asm/param.h are either generated includes of <asm-generic/param.h> or a #define or two followed by such include - no arch/*/include/asm/param.h anywhere, generated or not - include <asm/param.h> resolves to arch/*/include/uapi/asm/param.h of the architecture in question (or that of host in case of uml) - include/asm-generic/param.h pulls uapi/asm-generic/param.h and deals with USER_HZ, CLOCKS_PER_SEC and with HZ redefinition after that" * tag 'pull-headers_param' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: loongarch, um, xtensa: get rid of generated arch/$ARCH/include/asm/param.h alpha: regularize the situation with asm/param.h xtensa: get rid uapi/asm/param.h
| * loongarch, um, xtensa: get rid of generated arch/$ARCH/include/asm/param.hAl Viro2025-06-251-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | For loongarch and xtensa that gets them to do what x86 et.al. are doing - have asm/param.h resolve to uapi variant, which is generated by mandatory-y += param.h and contains exact same include. On um it will resolve to x86 uapi variant instead, which also contains the same include (um doesn't have uapi headers, but it does build the host ones). Reviewed-by: Arnd Bergmann <[email protected]> Signed-off-by: Al Viro <[email protected]>
* | um: vector: Reduce stack usage in vector_eth_configure()Tiwei Bie2025-06-251-29/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When compiling with clang (19.1.7), initializing *vp using a compound literal may result in excessive stack usage. Fix it by initializing the required fields of *vp individually. Without this patch: $ objdump -d arch/um/drivers/vector_kern.o | ./scripts/checkstack.pl x86_64 0 ... 0x0000000000000540 vector_eth_configure [vector_kern.o]:1472 ... With this patch: $ objdump -d arch/um/drivers/vector_kern.o | ./scripts/checkstack.pl x86_64 0 ... 0x0000000000000540 vector_eth_configure [vector_kern.o]:208 ... Reported-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
* | um: vfio: Prevent duplicate device assignmentsTiwei Bie2025-06-251-0/+14
| | | | | | | | | | | | | | | | | | | | Ensure devices are assigned only once. Reject subsequent requests for duplicate assignments. Fixes: a0e2cb6a9063 ("um: Add VFIO-based virtual PCI driver") Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
* | um: ubd: Add missing error check in start_io_thread()Tiwei Bie2025-06-251-1/+1
| | | | | | | | | | | | | | | | | | | | The subsequent call to os_set_fd_block() overwrites the previous return value. OR the two return values together to fix it. Fixes: f88f0bdfc32f ("um: UBD Improvements") Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
* | mm: pgtable: fix pte_swp_exclusiveMagnus Lindholm2025-06-111-1/+1
|/ | | | | | | | | | | | | | | | | Make pte_swp_exclusive return bool instead of int. This will better reflect how pte_swp_exclusive is actually used in the code. This fixes swap/swapoff problems on Alpha due pte_swp_exclusive not returning correct values when _PAGE_SWP_EXCLUSIVE bit resides in upper 32-bits of PTE (like on alpha). Suggested-by: Al Viro <[email protected]> Signed-off-by: Magnus Lindholm <[email protected]> Cc: Sam James <[email protected]> Link: https://lore.kernel.org/lkml/[email protected]/ Link: https://lore.kernel.org/lkml/20250602041118.GA2675383@ZenIV/ [ Applied as the 'sed' script Al suggested - Linus ] Signed-off-by: Linus Torvalds <[email protected]>
* treewide, timers: Rename from_timer() to timer_container_of()Ingo Molnar2025-06-081-1/+1
| | | | | | | | | | | Move this API to the canonical timer_*() namespace. [ tglx: Redone against pre rc1 ] Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Link: https://lore.kernel.org/all/[email protected]
* Merge tag 'kbuild-v6.16' of ↵Linus Torvalds2025-06-071-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild updates from Masahiro Yamada: - Add support for the EXPORT_SYMBOL_GPL_FOR_MODULES() macro, which exports a symbol only to specified modules - Improve ABI handling in gendwarfksyms - Forcibly link lib-y objects to vmlinux even if CONFIG_MODULES=n - Add checkers for redundant or missing <linux/export.h> inclusion - Deprecate the extra-y syntax - Fix a genksyms bug when including enum constants from *.symref files * tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (28 commits) genksyms: Fix enum consts from a reference affecting new values arch: use always-$(KBUILD_BUILTIN) for vmlinux.lds kbuild: set y instead of 1 to KBUILD_{BUILTIN,MODULES} efi/libstub: use 'targets' instead of extra-y in Makefile module: make __mod_device_table__* symbols static scripts/misc-check: check unnecessary #include <linux/export.h> when W=1 scripts/misc-check: check missing #include <linux/export.h> when W=1 scripts/misc-check: add double-quotes to satisfy shellcheck kbuild: move W=1 check for scripts/misc-check to top-level Makefile scripts/tags.sh: allow to use alternative ctags implementation kconfig: introduce menu type enum docs: symbol-namespaces: fix reST warning with literal block kbuild: link lib-y objects to vmlinux forcibly even when CONFIG_MODULES=n tinyconfig: enable CONFIG_LD_DEAD_CODE_DATA_ELIMINATION docs/core-api/symbol-namespaces: drop table of contents and section numbering modpost: check forbidden MODULE_IMPORT_NS("module:") at compile time kbuild: move kbuild syntax processing to scripts/Makefile.build Makefile: remove dependency on archscripts for header installation Documentation/kbuild: Add new gendwarfksyms kABI rules Documentation/kbuild: Drop section numbers ...
| * arch: use always-$(KBUILD_BUILTIN) for vmlinux.ldsMasahiro Yamada2025-06-071-1/+1
| | | | | | | | | | | | | | | | | | The extra-y syntax is deprecated. Instead, use always-$(KBUILD_BUILTIN), which behaves equivalently. Signed-off-by: Masahiro Yamada <[email protected]> Acked-by: Johannes Berg <[email protected]> Reviewed-by: Nicolas Schier <[email protected]>
* | Merge tag 'uml-for-linux-6.16-rc1' of ↵Linus Torvalds2025-06-0567-4283/+2304
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull UML updates from Johannes Berg: "The only really new thing is the long-standing seccomp work (originally from 2021!). Wven if it still isn't enabled by default due to security concerns it can still be used e.g. for tests. - remove obsolete network transports - remove PCI IO port support - start adding seccomp-based process handling instead of ptrace" * tag 'uml-for-linux-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (29 commits) um: remove "extern" from implementation of sigchld_handler um: fix unused variable warning um: fix SECCOMP 32bit xstate register restore um: pass FD for memory operations when needed um: Add SECCOMP support detection and initialization um: Implement kernel side of SECCOMP based process handling um: Track userspace children dying in SECCOMP mode um: Add helper functions to get/set state for SECCOMP um: Add stub side of SECCOMP/futex based process handling um: Move faultinfo extraction into userspace routine um: vector: Use mac_pton() for MAC address parsing um: vector: Clean up and modernize log messages um: chan_kern: use raw spinlock for irqs_to_free_lock MAINTAINERS: remove obsolete file entry in TUN/TAP DRIVER um: Fix tgkill compile error on old host OSes um: stop using PCI port I/O um: Remove legacy network transport infrastructure um: vector: Eliminate the dependency on uml_net um: Remove obsolete legacy network transports um/asm: Replace "REP; NOP" with PAUSE mnemonic ...
| * | um: remove "extern" from implementation of sigchld_handlerBenjamin Berg2025-06-051-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is no need to mark the function as extern in the implementation. Reported-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ Fixes: 8420e08fe3a5 ("um: Track userspace children dying in SECCOMP mode") Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: fix SECCOMP 32bit xstate register restoreBenjamin Berg2025-06-041-4/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There was a typo that caused the extended FP state to be copied into the wrong location on 32 bit. On 32 bit we only store the xstate internally as that already contains everything. However, for compatibility, the mcontext on 32 bit first contains the legacy FP state and then the xstate. The code copied the xstate on top of the legacy FP state instead of using the correct offset. This offset was already calculated in the xstate_* variables, so simply switch to those to fix the problem. With this SECCOMP mode works on 32 bit, so lift the restriction. Fixes: b1e1bd2e6943 ("um: Add helper functions to get/set state for SECCOMP") Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: pass FD for memory operations when neededBenjamin Berg2025-06-028-60/+280
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of always sharing the FDs with the userspace process, only hand over the FDs needed for mmap when required. The idea is that userspace might be able to force the stub into executing an mmap syscall, however, it will not be able to manipulate the control flow sufficiently to have access to an FD that would allow mapping arbitrary memory. Security wise, we need to be sure that only the expected syscalls are executed after the kernel sends FDs through the socket. This is currently not the case, as userspace can trivially jump to the rt_sigreturn syscall instruction to execute any syscall that the stub is permitted to do. With this, it can trick the kernel to send the FD, which in turn allows userspace to freely map any physical memory. As such, this is currently *not* secure. However, in principle the approach should be fine with a more strict SECCOMP filter and a careful review of the stub control flow (as userspace can prepare a stack). With some care, it is likely possible to extend the security model to SMP if desired. Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Add SECCOMP support detection and initializationBenjamin Berg2025-06-022-4/+195
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This detects seccomp support, sets the global using_seccomp variable and initilizes the exec registers. The support is only enabled if the seccomp= kernel parameter is set to either "on" or "auto". With "auto" a fallback to ptrace mode will happen if initialization failed. Signed-off-by: Benjamin Berg <[email protected]> Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] [extend help with Kconfig text from v2, use exit syscall instead of libc, remove unneeded mctx_offset assignment, disable on 32-bit for now] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Implement kernel side of SECCOMP based process handlingBenjamin Berg2025-06-028-132/+436
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds the kernel side of the seccomp based process handling. Co-authored-by: Johannes Berg <[email protected]> Signed-off-by: Benjamin Berg <[email protected]> Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Track userspace children dying in SECCOMP modeBenjamin Berg2025-06-0211-8/+145
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When in seccomp mode, we would hang forever on the futex if a child has died unexpectedly. In contrast, ptrace mode will notice it and kill the corresponding thread when it fails to run it. Fix this issue using a new IRQ that is fired after a SIGCHLD and keeping an (internal) list of all MMs. In the IRQ handler, find the affected MM and set its PID to -1 as well as the futex variable to FUTEX_IN_KERN. This, together with futex returning -EINTR after the signal is sufficient to implement a race-free detection of a child dying. Note that this also enables IRQ handling while starting a userspace process. This should be safe and SECCOMP requires the IRQ in case the process does not come up properly. Signed-off-by: Benjamin Berg <[email protected]> Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Add stub side of SECCOMP/futex based process handlingBenjamin Berg2025-06-023-0/+65
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds the stub side for the new seccomp process management code. In this case we do register save/restore through the signal handler mcontext. Add special code for handling TLS, which for x86_64 means setting the FS_BASE/GS_BASE registers while for i386 it means calling the set_thread_area syscall. Co-authored-by: Johannes Berg <[email protected]> Signed-off-by: Benjamin Berg <[email protected]> Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Move faultinfo extraction into userspace routineBenjamin Berg2025-06-021-11/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The segv handler is called slightly differently depending on whether PTRACE_FULL_FAULTINFO is set or not (32bit vs. 64bit). The only difference is that we don't try to pass the registers and instruction pointer to the segv handler. It would be good to either document or remove the difference, but I do not know why this difference exists. And, passing NULL can even result in a crash. Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: vector: Use mac_pton() for MAC address parsingTiwei Bie2025-06-021-11/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | Use mac_pton() instead of custom approach. Suggested-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: vector: Clean up and modernize log messagesTiwei Bie2025-06-021-25/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use pr_*() and netdev_*() to print log messages. While at it, join split messages for easier grepping. Suggested-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: chan_kern: use raw spinlock for irqs_to_free_lockJohannes Berg2025-06-021-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | Since this is called deep in the ARCH=um IRQ infrastructure it must use a raw spinlock. It's not really part of the driver, but rather the core UML IRQ code. Link: https://patch.msgid.link/20250505103358.ae7dc659f8b4.I64ca7aece30e0b4b0b5b35ad89cdd63db197c0ce@changeid Signed-off-by: Johannes Berg <[email protected]>
| * | um: Fix tgkill compile error on old host OSesYongting Lin2025-06-021-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | tgkill is a quite old syscall since kernel 2.5.75, but unfortunately glibc doesn't support it before 2.30. Thus some systems fail to compile the latest UserMode Linux. Here is the compile error I encountered when I tried to compile UML in my system shipped with glibc-2.28. CALL scripts/checksyscalls.sh CC arch/um/os-Linux/sigio.o In file included from arch/um/os-Linux/sigio.c:17: arch/um/os-Linux/sigio.c: In function ‘write_sigio_thread’: arch/um/os-Linux/sigio.c:49:19: error: implicit declaration of function ‘tgkill’; did you mean ‘kill’? [-Werror=implicit-function-declaration] CATCH_EINTR(r = tgkill(pid, pid, SIGIO)); ^~~~~~ ./arch/um/include/shared/os.h:21:48: note: in definition of macro ‘CATCH_EINTR’ #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR)) ^~~~ cc1: some warnings being treated as errors Fix it by Replacing glibc call with raw syscall. Fixes: 33c9da5dfb18 ("um: Rewrite the sigio workaround based on epoll and tgkill") Signed-off-by: Yongting Lin <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: stop using PCI port I/OArnd Bergmann2025-06-023-20/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | arch/um is one of the last users of CONFIG_GENERIC_IOMAP, but upon closer look it appears that the PCI host bridge does not register any port I/O, and the absense of both custom inb/outb functions and a PCI_IOBASE constant means that actually trying to use port I/O results on a NULL pointer access. Build testing with clang confirms this by warning about this exact problem: include/asm-generic/io.h:549:31: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] 549 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ Remove all the Kconfig selects that refer to legacy port I/O and instead just build the normal MMIO path that is emulated by the virtio PCI host. Signed-off-by: Arnd Bergmann <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Remove legacy network transport infrastructureTiwei Bie2025-05-058-1307/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All legacy network transports have been removed. Vector transports provide the same capabilities with significantly higher network throughput. There is no reason to keep the legacy network transport infrastructure anymore. Remove it to reduce the maintenance burden. Signed-off-by: Tiwei Bie <[email protected]> Acked-By: Anton Ivanov <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: vector: Eliminate the dependency on uml_netTiwei Bie2025-05-052-3/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only dependency on uml_net (i.e., the legacy network transport infrastructure) is the call to uml_net_setup_etheraddr(). Implement it inside vector to eliminate the uml_net dependency completely. It will allow us to remove uml_net in the next step. Signed-off-by: Tiwei Bie <[email protected]> Acked-By: Anton Ivanov <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Remove obsolete legacy network transportsTiwei Bie2025-05-0531-2728/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These legacy network transports were marked as obsolete in commit 40814b98a570 ("um: Mark non-vector net transports as obsolete"). More than five years have passed since then. Remove these network transports to reduce the maintenance burden. Suggested-by: Anton Ivanov <[email protected]> Signed-off-by: Tiwei Bie <[email protected]> Acked-By: Anton Ivanov <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | irqdomain: um: use irq_domain_create_linear() helperJiri Slaby (SUSE)2025-05-051-10/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | um_pci_init() open-codes what the irq_domain_create_linear() helper does already. Use the helper instead of open-coding it. This needs retval checking modification. Signed-off-by: Jiri Slaby (SUSE) <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Anton Ivanov <[email protected]> Cc: Johannes Berg <[email protected]> Cc: [email protected] Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Add VFIO-based virtual PCI driverTiwei Bie2025-05-055-0/+1023
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement a new virtual PCI driver based on the VFIO framework. This driver allows users to pass through PCI devices to UML via VFIO. Currently, only MSI-X capable devices are supported, and it is assumed that drivers will use MSI-X. Signed-off-by: Tiwei Bie <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: use proper care when taking mmap lock during segfaultBenjamin Berg2025-05-051-12/+117
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Segfaults can occur at times where the mmap lock cannot be taken. If that happens the segfault handler may not be able to take the mmap lock. Fix the code to use the same approach as most other architectures. Unfortunately, this requires copying code from mm/memory.c and modifying it slightly as UML does not have exception tables. Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: do not send SIGALRM to userspace in time-travel modeBenjamin Berg2025-05-051-4/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We send a SIGALRM to userspace processes to interrupt them. Really, doing so is only needed if they are actually executing at the time (to ensure we return to kernelspace). Unfortunately, we do not have that information readily available. We can however be sure that this is never the case when we are in time-travel mode with infinite CPU. Signed-off-by: Benjamin Berg <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Remove duplicate arch.h headerJiapeng Chong2025-05-051-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ./arch/um/kernel/trap.c: arch.h is included more than once. Reported-by: Abaci Robot <[email protected]> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=19877 Signed-off-by: Jiapeng Chong <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
| * | um: Add cmpxchg8b_emu and checksum functions to asm-prototypes.hSami Tolvanen2025-05-051-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With CONFIG_GENDWARFKSYMS, um builds fail due to missing prototypes in asm/asm-prototypes.h. Add declarations for cmpxchg8b_emu and the exported checksum functions, including csum_partial_copy_generic as it's also exported. Cc: Masahiro Yamada <[email protected]> Cc: [email protected] Reported-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ Signed-off-by: Sami Tolvanen <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]>
generated by cgit (git 2.51.2) at 2025-12-01 02:19:11 +0000