kernel.git/fs/pstore/ram.c, branch linux-3.12.y

pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next_prz

2015-02-08T19:02:06Z

commit b0aa931fb84431394d995472d0af2a6c2b61064d upstream. ramoops_get_next_prz get the prz according the paramters. If it get a uninitialized prz, access its members by following persistent_ram_old_size(prz) will cause a NULL pointer crash. Ex: if ftrace_size is 0, fprz will be NULL. Fix it by return NULL in advance. Signed-off-by: Liu ShuoX Acked-by: Kees Cook Signed-off-by: Tony Luck Cc: HuKeping Signed-off-by: Jiri Slaby

pstore: skip zero size persistent ram buffer in traverse

2015-02-08T19:02:06Z

commit aa9a4a1edfbd3d223af01db833da2f07850bc655 upstream. In ramoops_pstore_read, a valid prz pointer with zero size buffer will break traverse of all persistent ram buffers. The latter buffer might be lost. Signed-off-by: Liu ShuoX Cc: "Zhang, Yanmin" Cc: Colin Cross Reviewed-by: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Tony Luck Cc: HuKeping Signed-off-by: Jiri Slaby

pstore: clarify clearing of _read_cnt in ramoops_context

2015-02-08T19:02:05Z

commit 57fd835385a043577457a385f28c08be693991bf upstream. *_read_cnt in ramoops_context need to be cleared during pstore ->open to support mutli times getting the records. The patch added missed ftrace_read_cnt clearing and removed duplicate clearing in ramoops_probe. Signed-off-by: Liu ShuoX Cc: "Zhang, Yanmin" Cc: Colin Cross Cc: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Tony Luck Cc: HuKeping Signed-off-by: Jiri Slaby

pstore-ram: Allow optional mapping with pgprot_noncached

2015-01-26T13:38:46Z

commit 027bc8b08242c59e19356b4b2c189f2d849ab660 upstream. On some ARMs the memory can be mapped pgprot_noncached() and still be working for atomic operations. As pointed out by Colin Cross , in some cases you do want to use pgprot_noncached() if the SoC supports it to see a debug printk just before a write hanging the system. On ARMs, the atomic operations on strongly ordered memory are implementation defined. So let's provide an optional kernel parameter for configuring pgprot_noncached(), and use pgprot_writecombine() by default. Cc: Arnd Bergmann Cc: Rob Herring Cc: Randy Dunlap Cc: Anton Vorontsov Cc: Colin Cross Cc: Olof Johansson Cc: Russell King Acked-by: Kees Cook Signed-off-by: Tony Lindgren Signed-off-by: Tony Luck Signed-off-by: Jiri Slaby

pstore/ram: (really) fix undefined usage of rounddown_pow_of_two

2013-08-30T22:57:01Z

Previous attempt to fix was b042e47491ba5f487601b5141a3f1d8582304170 Suggested use of is_power_of_2() was bogus because is_power_of_2(0) is false (documented behaviour). Signed-off-by: Maxime Bizon Acked-by: Kees Cook Signed-off-by: Tony Luck

pstore/ram: Read and write to the 'compressed' flag of pstore

2013-08-19T18:53:50Z

In pstore write, add character 'C'(compressed) or 'D'(decompressed) in the header while writing to Ram persistent buffer. In pstore read, read the header and update the 'compressed' flag accordingly. Signed-off-by: Aruna Balakrishnaiah Reviewed-by: Kees Cook Signed-off-by: Tony Luck

pstore: Introduce new argument 'compressed' in the read callback

2013-08-19T17:18:11Z

Backends will set the flag 'compressed' after reading the log from persistent store to indicate the data being returned to pstore is compressed or not. Signed-off-by: Aruna Balakrishnaiah Reviewed-by: Kees Cook Signed-off-by: Tony Luck

pstore: Add new argument 'compressed' in pstore write callback

2013-08-19T17:18:10Z

Addition of new argument 'compressed' in the write call back will help the backend to know if the data passed from pstore is compressed or not (In case where compression fails.). If compressed, the backend can add a tag indicating the data is compressed while writing to persistent store. Signed-off-by: Aruna Balakrishnaiah Reviewed-by: Kees Cook Signed-off-by: Tony Luck

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2013-07-04T17:29:23Z

Pull powerpc updates from Ben Herrenschmidt: "This is the powerpc changes for the 3.11 merge window. In addition to the usual bug fixes and small updates, the main highlights are: - Support for transparent huge pages by Aneesh Kumar for 64-bit server processors. This allows the use of 16M pages as transparent huge pages on kernels compiled with a 64K base page size. - Base VFIO support for KVM on power by Alexey Kardashevskiy - Wiring up of our nvram to the pstore infrastructure, including putting compressed oopses in there by Aruna Balakrishnaiah - Move, rework and improve our "EEH" (basically PCI error handling and recovery) infrastructure. It is no longer specific to pseries but is now usable by the new "powernv" platform as well (no hypervisor) by Gavin Shan. - I fixed some bugs in our math-emu instruction decoding and made it usable to emulate some optional FP instructions on processors with hard FP that lack them (such as fsqrt on Freescale embedded processors). - Support for Power8 "Event Based Branch" facility by Michael Ellerman. This facility allows what is basically "userspace interrupts" for performance monitor events. - A bunch of Transactional Memory vs. Signals bug fixes and HW breakpoint/watchpoint fixes by Michael Neuling. And more ... I appologize in advance if I've failed to highlight something that somebody deemed worth it." * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (156 commits) pstore: Add hsize argument in write_buf call of pstore_ftrace_call powerpc/fsl: add MPIC timer wakeup support powerpc/mpic: create mpic subsystem object powerpc/mpic: add global timer support powerpc/mpic: add irq_set_wake support powerpc/85xx: enable coreint for all the 64bit boards powerpc/8xx: Erroneous double irq_eoi() on CPM IRQ in MPC8xx powerpc/fsl: Enable CONFIG_E1000E in mpc85xx_smp_defconfig powerpc/mpic: Add get_version API both for internal and external use powerpc: Handle both new style and old style reserve maps powerpc/hw_brk: Fix off by one error when validating DAWR region end powerpc/pseries: Support compression of oops text via pstore powerpc/pseries: Re-organise the oops compression code pstore: Pass header size in the pstore write callback powerpc/powernv: Fix iommu initialization again powerpc/pseries: Inform the hypervisor we are using EBB regs powerpc/perf: Add power8 EBB support powerpc/perf: Core EBB support for 64-bit book3s powerpc/perf: Drop MMCRA from thread_struct powerpc/perf: Don't enable if we have zero events ...

pstore: Pass header size in the pstore write callback

2013-07-01T08:10:48Z

Header size is needed to distinguish between header and the dump data. Incorporate the addition of new argument (hsize) in the pstore write callback. Signed-off-by: Aruna Balakrishnaiah Acked-by: Kees Cook Signed-off-by: Benjamin Herrenschmidt