Buildresult: linus/sun3_defconfig/m68k-gcc8 built on Mar 30 2022, 10:28

kisskb

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Status:	OK
Date/Time:	Mar 30 2022, 10:28
Duration:	0:03:37.732644
Builder:	ka2
Revision:	fs: fd tables have to be multiples of BITS_PER_LONG (`1c24a186398f59c80adb9a967486b65c1423a59d)`
Target:	linus/sun3_defconfig/m68k-gcc8
Branch:	linus
Compiler:	m68k-gcc8 (m68k-linux-gcc (GCC) 8.1.0 / GNU ld (GNU Binutils) 2.30)
Config:	sun3_defconfig (download)
Log:	Download original Possible warnings (1) drivers/net/ethernet/i825xx/sun3_82586.c:989:108: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct [1]' [-Warray-bounds] Full Log # git rev-parse -q --verify 1c24a186398f59c80adb9a967486b65c1423a59d^{commit} 1c24a186398f59c80adb9a967486b65c1423a59d already have revision, skipping fetch # git checkout -q -f -B kisskb 1c24a186398f59c80adb9a967486b65c1423a59d # git clean -qxdf # < git log -1 # commit 1c24a186398f59c80adb9a967486b65c1423a59d # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Tue Mar 29 15:06:39 2022 -0700 # # fs: fd tables have to be multiples of BITS_PER_LONG # # This has always been the rule: fdtables have several bitmaps in them, # and as a result they have to be sized properly for bitmaps. We walk # those bitmaps in chunks of 'unsigned long' in serveral cases, but even # when we don't, we use the regular kernel bitops that are defined to work # on arrays of 'unsigned long', not on some byte array. # # Now, the distinction between arrays of bytes and 'unsigned long' # normally only really ends up being noticeable on big-endian systems, but # Fedor Pchelkin and Alexey Khoroshilov reported that copy_fd_bitmaps() # could be called with an argument that wasn't even a multiple of # BITS_PER_BYTE. And then it fails to do the proper copy even on # little-endian machines. # # The bug wasn't in copy_fd_bitmap(), but in sane_fdtable_size(), which # didn't actually sanitize the fdtable size sufficiently, and never made # sure it had the proper BITS_PER_LONG alignment. # # That's partly because the alignment historically came not from having to # explicitly align things, but simply from previous fdtable sizes, and # from count_open_files(), which counts the file descriptors by walking # them one 'unsigned long' word at a time and thus naturally ends up doing # sizing in the proper 'chunks of unsigned long'. # # But with the introduction of close_range(), we now have an external # source of "this is how many files we want to have", and so # sane_fdtable_size() needs to do a better job. # # This also adds that explicit alignment to alloc_fdtable(), although # there it is mainly just for documentation at a source code level. The # arithmetic we do there to pick a reasonable fdtable size already aligns # the result sufficiently. # # In fact,clang notices that the added ALIGN() in that function doesn't # actually do anything, and does not generate any extra code for it. # # It turns out that gcc ends up confusing itself by combining a previous # constant-sized shift operation with the variable-sized shift operations # in roundup_pow_of_two(). And probably due to that doesn't notice that # the ALIGN() is a no-op. But that's a (tiny) gcc misfeature that doesn't # matter. Having the explicit alignment makes sense, and would actually # matter on a 128-bit architecture if we ever go there. # # This also adds big comments above both functions about how fdtable sizes # have to have that BITS_PER_LONG alignment. # # Fixes: 60997c3d45d9 ("close_range: add CLOSE_RANGE_UNSHARE") # Reported-by: Fedor Pchelkin <aissur0002@gmail.com> # Reported-by: Alexey Khoroshilov <khoroshilov@ispras.ru> # Link: https://lore.kernel.org/all/20220326114009.1690-1-aissur0002@gmail.com/ # Tested-and-acked-by: Christian Brauner <brauner@kernel.org> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-ld --version # < git log --format=%s --max-count=1 1c24a186398f59c80adb9a967486b65c1423a59d # < make -s -j 8 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux- sun3_defconfig # < make -s -j 8 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux- help # make -s -j 8 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux- olddefconfig # make -s -j 8 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux- In file included from /kisskb/src/include/linux/swab.h:5, from /kisskb/src/include/uapi/linux/byteorder/big_endian.h:14, from /kisskb/src/include/linux/byteorder/big_endian.h:5, from /kisskb/src/arch/m68k/include/uapi/asm/byteorder.h:5, from /kisskb/src/include/asm-generic/bitops/le.h:6, from /kisskb/src/arch/m68k/include/asm/bitops.h:529, from /kisskb/src/include/linux/bitops.h:33, from /kisskb/src/include/linux/kernel.h:22, from /kisskb/src/drivers/net/ethernet/i825xx/sun3_82586.c:31: /kisskb/src/drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout': /kisskb/src/drivers/net/ethernet/i825xx/sun3_82586.c:989:108: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct [1]' [-Warray-bounds] printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); ~~~~~~~~~~~~^~~ /kisskb/src/include/uapi/linux/swab.h:107:12: note: in definition of macro '__swab16' __fswab16(x)) ^ /kisskb/src/include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ /kisskb/src/drivers/net/ethernet/i825xx/sun3_82586.c:989:3: note: in expansion of macro 'printk' printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); ^~~~~~ Completed OK # rm -rf /kisskb/build/linus_sun3_defconfig_m68k-gcc8 # Build took: 0:03:37.732644

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