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authorTobias Klauser <tklauser@distanz.ch>2016-08-18 11:58:41 +0200
committerTobias Klauser <tklauser@distanz.ch>2016-09-15 18:27:48 +0200
commit5ca82e492cd88813f22d40dc2fecaaa2b3dcd51d (patch)
treebc3e6c8dd9119befffa3f51b0e7347bc423245a9 /bpfc/.gitignore
parent93127b0f9515be4b8f1365d7670744fcac0ade16 (diff)
ifpps: Prevent division by zero
Even though it's very unlikely we ever read zero values from the cpu lines in /proc/stat, we should still protect against division by zero. Detected using UBSan. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'bpfc/.gitignore')
0 files changed, 0 insertions, 0 deletions
47487241ff59374fded8c477f21453681f5995c'>diff)
Merge branch 'sparc64-non-resumable-user-error-recovery'
Liam R. Howlett says: ==================== sparc64: Recover from userspace non-resumable PIO & MEM errors A non-resumable error from userspace is able to cause a kernel panic or trap loop due to the setup and handling of the queued traps once in the kernel. This patch series addresses both of these issues. The queues are fixed by simply zeroing the memory before use. PIO errors from userspace will result in a SIGBUS being sent to the user process. The MEM errors form userspace will result in a SIGKILL and also cause the offending pages to be claimed so they are no longer used in future tasks. SIGKILL is used to ensure that the process does not try to coredump and result in an attempt to read the memory again from within kernel space. Although there is a HV call to scrub the memory (mem_scrub), there is no easy way to guarantee that the real memory address(es) are not used by other tasks. Clearing the error with mem_scrub would zero the memory and cause the other processes to proceed with bad data. The handling of other non-resumable errors remain unchanged and will cause a panic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_trie.c')