** Tags removed: verification-needed-bionic ** Tags added: verification-done-bionic
** Tags removed: verification-needed-cosmic ** Tags added: verification-done-cosmic -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1813532 Title: x86/mm: Found insecure W+X mapping at address (ptrval)/0xc00a0000 Status in linux package in Ubuntu: Incomplete Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Fix Committed Bug description: == SRU Justification == Booting an i386 Bionic kernel in a VM with a 64-bit CPU leads to: [ 1.074702] Freeing unused kernel memory: 1092K [ 1.084027] Write protecting the kernel text: 8836k [ 1.085115] Write protecting the kernel read-only data: 3480k [ 1.086361] NX-protecting the kernel data: 7548k [ 1.087457] ------------[ cut here ]------------ [ 1.088400] x86/mm: Found insecure W+X mapping at address (ptrval)/0xc00a0000 [ 1.089738] WARNING: CPU: 0 PID: 1 at /build/linux-bnzN1b/linux-4.15.0/arch/x86/mm/dump_pagetables.c:266 note_page+0x670/0x860 [ 1.091893] Modules linked in: [ 1.092522] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0-43-generic #46-Ubuntu [ 1.094362] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014 [ 1.096279] EIP: note_page+0x670/0x860 [ 1.097012] EFLAGS: 00010282 CPU: 0 [ 1.097807] EAX: 00000041 EBX: df4fbf44 ECX: 000001ba EDX: 00000000 [ 1.099083] ESI: 80000000 EDI: 00000000 EBP: df4fbf10 ESP: df4fbee4 [ 1.100328] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 1.101418] CR0: 80050033 CR2: b7d99092 CR3: 0ce16000 CR4: 000006f0 [ 1.102693] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 1.103928] DR6: fffe0ff0 DR7: 00000400 [ 1.104733] Call Trace: [ 1.105316] ptdump_walk_pgd_level_core+0x2ac/0x2e0 [ 1.106266] ptdump_walk_pgd_level_checkwx+0x18/0x20 [ 1.107207] mark_rodata_ro+0xf5/0x117 [ 1.107947] ? rest_init+0xa0/0xa0 [ 1.108627] kernel_init+0x33/0xf0 [ 1.109300] ret_from_fork+0x2e/0x38 [ 1.110016] Code: cc e9 0c fb ff ff f7 c6 00 10 00 00 74 8c 68 fe ae ae cc e9 16 fe ff ff 52 52 68 ac af ae cc c6 05 a8 a8 cb cc 01 e8 40 74 00 00 <0f> 0b 8b 53 0c 83 c4 0c e9 38 fa ff ff 50 6a 08 52 6a 08 68 ae [ 1.113395] ---[ end trace 0dce1996d96c40bb ]--- [ 1.114324] x86/mm: Checked W+X mappings: FAILED, 96 W+X pages found. == Fix == Backport commit c200dac78fec ("x86/mm: Do not warn about PCI BIOS W+X mappings"). == Regression Potential == Low. The patch only modifies debugging output. == Test Case == To reproduce, boot an i386 kernel in QEMU with '-cpu qemu64' and check the kernel logs. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813532/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
