BMC/Intel-BMC/linux.git/arch/um/include, branch dev-4.7

um: Don't discard .text.exit section

2016-09-07T06:34:44+00:00

commit dad2232844073295c64e9cc2d734a0ade043e0f6 upstream. Commit e41f501d3912 ("vmlinux.lds: account for destructor sections") added '.text.exit' to EXIT_TEXT which is discarded at link time by default. This breaks compilation of UML: `.text.exit' referenced in section `.fini_array' of /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o): defined in discarded section `.text.exit' of /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o) Apparently UML doesn't want to discard exit text, so let's place all EXIT_TEXT sections in .exit.text. Fixes: e41f501d3912 ("vmlinux.lds: account for destructor sections") Reported-by: Stefan Traby Signed-off-by: Andrey Ryabinin Acked-by: Dmitry Vyukov Signed-off-by: Richard Weinberger Signed-off-by: Greg Kroah-Hartman

um: add extended processor state save/restore support

2016-05-21T21:38:06+00:00

This patch extends save_fp_registers() and restore_fp_registers() to use PTRACE_GETREGSET and PTRACE_SETREGSET with the XSTATE note type, adding support for new processor state extensions between context switches. When the new ptrace requests are unavailable, it falls back to the old PTRACE_GETFPREGS and PTRACE_SETFPREGS methods, which have been renamed to save_i387_registers() and restore_i387_registers(). Now these functions expect *fp_regs to have the space of an _xstate struct. Thus, this also makes ptrace in UML responde to PTRACE_GETFPREGS/_SETFPREG requests with a user_i387_struct (thus independent from HOST_FP_SIZE), and by calling save_i387_registers() and restore_i387_registers() instead of the extended save_fp_registers() and restore_fp_registers() functions. Signed-off-by: Eli Cooper

um, pkeys: Add UML arch_*_access_permitted() methods

2016-02-18T18:46:28+00:00

UML has a special mmu_context.h and needs updates whenever the generic one is updated. Signed-off-by: Dave Hansen Cc: Dave Hansen Cc: Jeff Dike Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Richard Weinberger Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org Cc: user-mode-linux-devel@lists.sourceforge.net Cc: user-mode-linux-user@lists.sourceforge.net Link: http://lkml.kernel.org/r/20160218183557.AE1DB383@viggo.jf.intel.com Signed-off-by: Ingo Molnar

um: asm/page.h: remove the pte_high member from struct pte_t

2016-02-06T02:10:40+00:00

Commit 16da306849d0 ("um: kill pfn_t") introduced a compile warning for defconfig (SUBARCH=i386): arch/um/kernel/skas/mmu.c:38:206: warning: right shift count >= width of type [-Wshift-count-overflow] Aforementioned patch changes the definition of the phys_to_pfn() macro from ((pfn_t) ((p) >> PAGE_SHIFT)) to ((p) >> PAGE_SHIFT) This effectively changes the phys_to_pfn() expansion's type from unsigned long long to unsigned long. Through the callchain init_stub_pte() => mk_pte(), the expansion of phys_to_pfn() is (indirectly) fed into the 'phys' argument of the pte_set_val(pte, phys, prot) macro, eventually leading to (pte).pte_high = (phys) >> 32; This results in the warning from above. Since UML only deals with 32 bit addresses, the upper 32 bits from 'phys' used to be always zero anyway. Also, all page protection flags defined by UML don't use any bits beyond bit 9. Since the contents of a PTE are defined within architecture scope only, the ->pte_high member can be safely removed. Remove the ->pte_high member from struct pte_t. Rename ->pte_low to ->pte. Adapt the pte helper macros in arch/um/include/asm/page.h. Noteworthy is the pte_copy() macro where a smp_wmb() gets dropped. This write barrier doesn't seem to be paired with any read barrier though and thus, was useless anyway. Fixes: 16da306849d0 ("um: kill pfn_t") Signed-off-by: Nicolai Stange Cc: Dan Williams Cc: Richard Weinberger Cc: Nicolai Stange Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

um: kill pfn_t

2016-01-16T01:56:32+00:00

The core has developed a need for a "pfn_t" type [1]. Convert the usage of pfn_t by usermode-linux to an unsigned long, and update pfn_to_phys() to drop its expectation of a typed pfn. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-September/002199.html Signed-off-by: Dan Williams Cc: Dave Hansen Cc: Jeff Dike Cc: Richard Weinberger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

um: Add seccomp support

2016-01-10T20:49:49+00:00

This brings SECCOMP_MODE_STRICT and SECCOMP_MODE_FILTER support through prctl(2) and seccomp(2) to User-mode Linux for i386 and x86_64 subarchitectures. secure_computing() is called first in handle_syscall() so that the syscall emulation will be aborted quickly if matching a seccomp rule. This is inspired from Meredydd Luff's patch (https://gerrit.chromium.org/gerrit/21425). Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Cc: Ingo Molnar Cc: Kees Cook Cc: Andy Lutomirski Cc: Will Drewry Cc: Chris Metcalf Cc: Michael Ellerman Cc: James Hogan Cc: Meredydd Luff Cc: David Drysdale Signed-off-by: Richard Weinberger Acked-by: Kees Cook

um: Add full asm/syscall.h support

2016-01-10T20:49:49+00:00

Add subarchitecture-independent implementation of asm-generic/syscall.h allowing access to user system call parameters and results: * syscall_get_nr() * syscall_rollback() * syscall_get_error() * syscall_get_return_value() * syscall_set_return_value() * syscall_get_arguments() * syscall_set_arguments() * syscall_get_arch() provided by arch/x86/um/asm/syscall.h This provides the necessary syscall helpers needed by HAVE_ARCH_SECCOMP_FILTER plus syscall_get_error(). This is inspired from Meredydd Luff's patch (https://gerrit.chromium.org/gerrit/21425). Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Cc: Thomas Gleixner Cc: Ingo Molnar Cc: H. Peter Anvin Cc: Kees Cook Cc: Andy Lutomirski Cc: Will Drewry Cc: Meredydd Luff Cc: David Drysdale Signed-off-by: Richard Weinberger Acked-by: Kees Cook

um: Fix ptrace GETREGS/SETREGS bugs

2016-01-10T20:49:48+00:00

This fix two related bugs: * PTRACE_GETREGS doesn't get the right orig_ax (syscall) value * PTRACE_SETREGS can't set the orig_ax value (erased by initial value) Get rid of the now useless and error-prone get_syscall(). Fix inconsistent behavior in the ptrace implementation for i386 when updating orig_eax automatically update the syscall number as well. This is now updated in handle_syscall(). Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Cc: Thomas Gleixner Cc: Kees Cook Cc: Andy Lutomirski Cc: Will Drewry Cc: Thomas Meyer Cc: Nicolas Iooss Cc: Anton Ivanov Cc: Meredydd Luff Cc: David Drysdale Signed-off-by: Richard Weinberger Acked-by: Kees Cook

um: Update UBD to use pread/pwrite family of functions

2016-01-10T20:49:48+00:00

This decreases the number of syscalls per read/write by half. Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

um: Do not change hard IRQ flags in soft IRQ processing

2016-01-10T20:49:48+00:00

Software IRQ processing in generic architectures assumes that the exit out of hard IRQ may have re-enabled interrupts (some architectures may have an implicit EOI). It presumes them enabled and toggles the flags once more just in case unless this is turned off in the architecture specific hardirq.h by setting __ARCH_IRQ_EXIT_IRQS_DISABLED This patch adds this to UML where due to the way IRQs are handled it is an optimization (it works fine without it too). Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger