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Linux Kernel

The mainline Linux kernel.

Other Activity This Week

Linux 5.1-rc1
Linus Torvalds

Recent Activity

Merge tag 'sound-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Linus Torvalds

kasan, slab: make freelist stored without tags
Andrey Konovalov: Similarly to "kasan, slub: move kasan_poison_slab hook before page_address", move kasan_poison_slab() before alloc_slabmgmt(), which calls page_address(), to make page_address() return value to be non-tagged.

tmpfs: fix link accounting when a tmpfile is linked in
Darrick J. Wong: tmpfs has a peculiarity of accounting hard links as if they were separate inodes: so that when the number of inodes is limited, as it is by default, a user cannot soak up an unlimited amount of unreclaimable dcache memory just by repeatedly linking a file. But when v3.11 added O_TMPFILE, and the ability to use linkat() on the fd, we missed accommodating this new case in tmpfs: "df -i" shows that an extra "inode" remains accounted after the file is unlinked and the fd closed and the actual inode evicted.

exec: load_script: Do not exec truncated interpreter path
Kees Cook: Commit 8099b047ecc4 ("exec: load_script: don't blindly truncate shebang string") was trying to protect against a confused exec of a truncated interpreter path.

Activity Earlier In The Year

Change mincore() to count "mapped" pages rather than "cached" pages
Linus Torvalds: The semantics of what "in core" means for the mincore() system call are somewhat unclear, but Linux has always (since 2.3.52, which is when mincore() was initially done) treated it as "page is available in page cache" rather than "page is mapped in the mapping". The problem with that traditional semantic is that it exposes a lot of system cache state that it really probably shouldn't, and that users shouldn't really even care about. So let's try to avoid that information leak by simply changing the semantics to be that mincore() counts actual mapped pages, not pages that might be cheaply mapped if they were faulted (note the "might be" part of the old semantics: being in the cache doesn't actually guarantee that you can access them without IO anyway, since things like network filesystems may have to revalidate the cache before use). In many ways the old semantics were somewhat insane even aside from the information leak issue.

Fix 'acccess_ok()' on alpha and SH
Linus Torvalds: Commit 594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'") broke both alpha and SH booting in qemu, as noticed by Guenter Roeck. It turns out that the bug wasn't actually in that commit itself (which would have been surprising: it was mostly a no-op), but in how the addition of access_ok() to the strncpy_from_user() and strnlen_user() functions now triggered the case where those functions would test the access of the very last byte of the user address space. The string functions actually did that user range test before too, but they did it manually by just comparing against user_addr_max().

Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Linus Torvalds

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Linus Torvalds

mm, thp: restore node-local hugepage allocations
David Rientjes: This is a full revert of ac5b2c18911f ("mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings") and a partial revert of 89c83fb539f9 ("mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask"). By not setting __GFP_THISNODE, applications can allocate remote hugepages when the local node is fragmented or low on memory when either the thp defrag setting is "always" or the vma has been madvised with MADV_HUGEPAGE. Remote access to hugepages often has much higher latency than local pages of the native page size.

Merge tag 'mmc-v4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Linus Torvalds

Merge tag 'regulator-v5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Linus Torvalds

powerpc: disable support for relative ksymtab references
Ard Biesheuvel: The newly added code that emits ksymtab entries as pairs of 32-bit relative references interacts poorly with the way powerpc lays out its address space: when a module exports a per-CPU variable, the primary module region covering the ksymtab entry -and thus the 32-bit relative reference- is too far away from the actual per-CPU variable's base address (to which the per-CPU offsets are applied to obtain the respective address of each CPU's copy), resulting in corruption when the module loader attempts to resolve symbol references of modules that are loaded on top and link to the exported per-CPU symbol. So let's disable this feature on powerpc.

Merge tag 'sound-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Linus Torvalds

Merge tag 'mtd/for-4.19' of git://git.infradead.org/linux-mtd
Linus Torvalds

Linux Kernel Release Tags

Linux 5.1-rc1
Linus Torvalds

Linux 5.0-rc8
Linus Torvalds

Linux 5.0-rc6
Linus Torvalds

Linux 5.0-rc5
Linus Torvalds

Linux 5.0-rc4
Linus Torvalds

Linux 5.0-rc3
Linus Torvalds

Linux 5.0-rc2
Linus Torvalds

Linux 5.0-rc1
Linus Torvalds

Linux 4.20-rc7
Linus Torvalds

Linux 4.20-rc6
Linus Torvalds

Most Popular This Year

HID: intel_ish-hid: ipc: register more pm callbacks to support hibernation
Even Xu: Current ISH driver only registers suspend/resume PM callbacks which don't support hibernation (suspend to disk).

powerpc: disable support for relative ksymtab references
Ard Biesheuvel: The newly added code that emits ksymtab entries as pairs of 32-bit relative references interacts poorly with the way powerpc lays out its address space: when a module exports a per-CPU variable, the primary module region covering the ksymtab entry -and thus the 32-bit relative reference- is too far away from the actual per-CPU variable's base address (to which the per-CPU offsets are applied to obtain the respective address of each CPU's copy), resulting in corruption when the module loader attempts to resolve symbol references of modules that are loaded on top and link to the exported per-CPU symbol. So let's disable this feature on powerpc.

fs, elf: make sure to page align bss in load_elf_library
Oscar Salvador: The current code does not make sure to page align bss before calling

mm, thp: restore node-local hugepage allocations
David Rientjes: This is a full revert of ac5b2c18911f ("mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings") and a partial revert of 89c83fb539f9 ("mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask"). By not setting __GFP_THISNODE, applications can allocate remote hugepages when the local node is fragmented or low on memory when either the thp defrag setting is "always" or the vma has been madvised with MADV_HUGEPAGE. Remote access to hugepages often has much higher latency than local pages of the native page size.

tmpfs: fix link accounting when a tmpfile is linked in
Darrick J. Wong: tmpfs has a peculiarity of accounting hard links as if they were separate inodes: so that when the number of inodes is limited, as it is by default, a user cannot soak up an unlimited amount of unreclaimable dcache memory just by repeatedly linking a file. But when v3.11 added O_TMPFILE, and the ability to use linkat() on the fd, we missed accommodating this new case in tmpfs: "df -i" shows that an extra "inode" remains accounted after the file is unlinked and the fd closed and the actual inode evicted.

kasan, slab: make freelist stored without tags
Andrey Konovalov: Similarly to "kasan, slub: move kasan_poison_slab hook before page_address", move kasan_poison_slab() before alloc_slabmgmt(), which calls page_address(), to make page_address() return value to be non-tagged.

exec: load_script: Do not exec truncated interpreter path
Kees Cook: Commit 8099b047ecc4 ("exec: load_script: don't blindly truncate shebang string") was trying to protect against a confused exec of a truncated interpreter path.

powerpc/64s: Add support for a store forwarding barrier at kernel entry/exit
Nicholas Piggin: On some CPUs we can prevent a vulnerability related to store-to-load forwarding by preventing store forwarding between privilege domains, by inserting a barrier in kernel entry and exit paths.

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Linus Torvalds

Merge tag 'sound-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Linus Torvalds

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