In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
PCI: Check ROM header and data structure addr before accessing<\/p>\n
We meet a crash when running stress-ng on x86_64 machine:<\/p>\n
BUG: unable to handle page fault for address: ffa0000007f40000
\n RIP: 0010:pci_get_rom_size+0x52\/0x220
\n Call Trace:<\/p>\n
pci_map_rom+0x80\/0x130
\n pci_read_rom+0x4b\/0xe0
\n kernfs_file_read_iter+0x96\/0x180
\n vfs_read+0x1b1\/0x300<\/p>\n
Our analysis reveals that the ROM space’s start address is
\n0xffa0000007f30000, and size is 0x10000. Because of broken ROM space,
\nbefore calling readl(pds), the pds’s value is 0xffa0000007f3ffff, which is
\nalready pointed to the ROM space end, invoking readl() would read 4 bytes
\ntherefore cause an out-of-bounds access and trigger a crash. Fix this by
\nadding image header and data structure checking.<\/p>\n
We also found another crash on arm64 machine:<\/p>\n
Unable to handle kernel paging request at virtual address ffff8000dd1393ff
\n Mem abort info:
\n ESR = 0x0000000096000021
\n EC = 0x25: DABT (current EL), IL = 32 bits
\n SET = 0, FnV = 0
\n EA = 0, S1PTW = 0
\n FSC = 0x21: alignment fault<\/p>\n
The call trace is the same with x86_64, but the crash reason is that the
\ndata structure addr is not aligned with 4, and arm64 machine report
\n“alignment fault”. Fix this by adding alignment checking.<\/p>\n
[bhelgaas: shorten function names, wrap comments]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
PCI: Check ROM header and data structure addr before accessing<\/p>\n
We meet a crash when running stress-ng on x86_64 machine:<\/p>\n
BUG: u<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7158","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7158"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}