Buildresult: powerpc-next/x86_64-allnoconfig/x86_64-gcc4.6 built on Jun 8 2019, 00:44

kisskb

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Status:	OK
Date/Time:	Jun 8 2019, 00:44
Duration:	0:00:09.867030
Builder:	ka4
Revision:	powerpc/pseries/hvconsole: Fix stack overread via udbg (`6754297c2924cd55843499bc2bb338843177931f)`
Target:	powerpc-next/x86_64-allnoconfig/x86_64-gcc4.6
Branch:	powerpc-next
Compiler:	x86_64-gcc4.6 (x86_64-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	allnoconfig (download)
Log:	Download original Possible warnings (3) kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] arch/x86/kernel/apic/io_apic.c:1036:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized] arch/x86/kernel/e820.c:664:16: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 6754297c2924cd55843499bc2bb338843177931f^{commit} 6754297c2924cd55843499bc2bb338843177931f already have revision, skipping fetch # git checkout -q -f -B kisskb 6754297c2924cd55843499bc2bb338843177931f # git clean -qxdf # < git log -1 # commit 6754297c2924cd55843499bc2bb338843177931f # Author: Daniel Axtens <dja@axtens.net> # Date: Mon Jun 3 16:56:57 2019 +1000 # # powerpc/pseries/hvconsole: Fix stack overread via udbg # # While developing KASAN for 64-bit book3s, I hit the following stack # over-read. # # It occurs because the hypercall to put characters onto the terminal # takes 2 longs (128 bits/16 bytes) of characters at a time, and so # hvc_put_chars() would unconditionally copy 16 bytes from the argument # buffer, regardless of supplied length. However, udbg_hvc_putc() can # call hvc_put_chars() with a single-byte buffer, leading to the error. # # ================================================================== # BUG: KASAN: stack-out-of-bounds in hvc_put_chars+0xdc/0x110 # Read of size 8 at addr c0000000023e7a90 by task swapper/0 # # CPU: 0 PID: 0 Comm: swapper Not tainted 5.2.0-rc2-next-20190528-02824-g048a6ab4835b #113 # Call Trace: # dump_stack+0x104/0x154 (unreliable) # print_address_description+0xa0/0x30c # __kasan_report+0x20c/0x224 # kasan_report+0x18/0x30 # __asan_report_load8_noabort+0x24/0x40 # hvc_put_chars+0xdc/0x110 # hvterm_raw_put_chars+0x9c/0x110 # udbg_hvc_putc+0x154/0x200 # udbg_write+0xf0/0x240 # console_unlock+0x868/0xd30 # register_console+0x970/0xe90 # register_early_udbg_console+0xf8/0x114 # setup_arch+0x108/0x790 # start_kernel+0x104/0x784 # start_here_common+0x1c/0x534 # # Memory state around the buggy address: # c0000000023e7980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # c0000000023e7a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 # >c0000000023e7a80: f1 f1 01 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 # ^ # c0000000023e7b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # c0000000023e7b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # ================================================================== # # Document that a 16-byte buffer is requred, and provide it in udbg. # # Signed-off-by: Daniel Axtens <dja@axtens.net> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 6754297c2924cd55843499bc2bb338843177931f # < make -s -j 120 ARCH=x86_64 O=/kisskb/build/powerpc-next_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- allnoconfig # make -s -j 120 ARCH=x86_64 O=/kisskb/build/powerpc-next_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/arch/x86/kernel/apic/io_apic.c: In function 'mp_map_pin_to_irq': /kisskb/src/arch/x86/kernel/apic/io_apic.c:1036:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/arch/x86/kernel/e820.c: In function 'e820__setup_pci_gap': /kisskb/src/arch/x86/kernel/e820.c:664:16: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized] Completed OK # rm -rf /kisskb/build/powerpc-next_x86_64-allnoconfig_x86_64-gcc4.6 # Build took: 0:00:09.867030

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