cve-2022-48847
Vulnerability from cvelistv5
Published
2024-07-16 12:25
Modified
2024-12-19 08:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: watch_queue: Fix filter limit check In watch_queue_set_filter(), there are a couple of places where we check that the filter type value does not exceed what the type_filter bitmap can hold. One place calculates the number of bits by: if (tf[i].type >= sizeof(wfilter->type_filter) * 8) which is fine, but the second does: if (tf[i].type >= sizeof(wfilter->type_filter) * BITS_PER_LONG) which is not. This can lead to a couple of out-of-bounds writes due to a too-large type: (1) __set_bit() on wfilter->type_filter (2) Writing more elements in wfilter->filters[] than we allocated. Fix this by just using the proper WATCH_TYPE__NR instead, which is the number of types we actually know about. The bug may cause an oops looking something like: BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter+0x659/0x740 Write of size 4 at addr ffff88800d2c66bc by task watch_queue_oob/611 ... Call Trace: <TASK> dump_stack_lvl+0x45/0x59 print_address_description.constprop.0+0x1f/0x150 ... kasan_report.cold+0x7f/0x11b ... watch_queue_set_filter+0x659/0x740 ... __x64_sys_ioctl+0x127/0x190 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae Allocated by task 611: kasan_save_stack+0x1e/0x40 __kasan_kmalloc+0x81/0xa0 watch_queue_set_filter+0x23a/0x740 __x64_sys_ioctl+0x127/0x190 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88800d2c66a0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 28 bytes inside of 32-byte region [ffff88800d2c66a0, ffff88800d2c66c0)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b09f28f70a5046acd64138075ae3f095238b045Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/648895da69ced90ca770fd941c3d9479a9d72c16Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b36588ebbcef74583824c08352e75838d6fb4ff2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c993ee0f9f81caf5767a50d1faeba39a0dc82af2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1b09f28f70a5046acd64138075ae3f095238b045Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/648895da69ced90ca770fd941c3d9479a9d72c16Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b36588ebbcef74583824c08352e75838d6fb4ff2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c993ee0f9f81caf5767a50d1faeba39a0dc82af2Patch
Impacted products
Vendor Product Version
Linux Linux Version: c73be61cede5882f9605a852414db559c0ebedfd
Version: c73be61cede5882f9605a852414db559c0ebedfd
Version: c73be61cede5882f9605a852414db559c0ebedfd
Version: c73be61cede5882f9605a852414db559c0ebedfd
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One place calculates the number of bits by:\\n\\n   if (tf[i].type >= sizeof(wfilter->type_filter) * 8)\\n\\nwhich is fine, but the second does:\\n\\n   if (tf[i].type >= sizeof(wfilter->type_filter) * BITS_PER_LONG)\\n\\nwhich is not.  This can lead to a couple of out-of-bounds writes due to\\na too-large type:\\n\\n (1) __set_bit() on wfilter->type_filter\\n (2) Writing more elements in wfilter->filters[] than we allocated.\\n\\nFix this by just using the proper WATCH_TYPE__NR instead, which is the\\nnumber of types we actually know about.\\n\\nThe bug may cause an oops looking something like:\\n\\n  BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter+0x659/0x740\\n  Write of size 4 at addr ffff88800d2c66bc by task watch_queue_oob/611\\n  ...\\n  Call Trace:\\n   <TASK>\\n   dump_stack_lvl+0x45/0x59\\n   print_address_description.constprop.0+0x1f/0x150\\n   ...\\n   kasan_report.cold+0x7f/0x11b\\n   ...\\n   watch_queue_set_filter+0x659/0x740\\n   ...\\n   __x64_sys_ioctl+0x127/0x190\\n   do_syscall_64+0x43/0x90\\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\n  Allocated by task 611:\\n   kasan_save_stack+0x1e/0x40\\n   __kasan_kmalloc+0x81/0xa0\\n   watch_queue_set_filter+0x23a/0x740\\n   __x64_sys_ioctl+0x127/0x190\\n   do_syscall_64+0x43/0x90\\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\n  The buggy address belongs to the object at ffff88800d2c66a0\\n   which belongs to the cache kmalloc-32 of size 32\\n  The buggy address is located 28 bytes inside of\\n   32-byte region [ffff88800d2c66a0, ffff88800d2c66c0)\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:17:44.668Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2022-48847\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:17:44.668Z\", \"dateReserved\": \"2024-07-16T11:38:08.911Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T12:25:15.804Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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