Description
In the Linux kernel, the following vulnerability has been resolved: gfs2: Validate i_depth for exhash directories A fuzzer test introduced corruption that ends up with a depth of 0 in dir_e_read(), causing an undefined shift by 32 at: index = hash >> (32 - dip->i_depth); As calculated in an open-coded way in dir_make_exhash(), the minimum depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time. So we can avoid the undefined behaviour by checking for depth values lower than the minimum in gfs2_dinode_in(). Values greater than the maximum are already being checked for there. Also switch the calculation in dir_make_exhash() to use ilog2() to clarify how the depth is calculated. Tested with the syzkaller repro.c and xfstests '-g quick'.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
9a0045088d888c9c539c8c626a366cb52c0fbdab to < 076e992752e4b24178918f748d75597c80a408d2affected9a0045088d888c9c539c8c626a366cb52c0fbdab to < 366183911b153e9b8cf758e1414e1154d7569337affected9a0045088d888c9c539c8c626a366cb52c0fbdab to < 112bb60cd0e254a369e95aa9941a694ffeca089faffected9a0045088d888c9c539c8c626a366cb52c0fbdab to < cddea0c721106ea480371412d8de21705eb27376affected9a0045088d888c9c539c8c626a366cb52c0fbdab to < 53a0249d68a210c16e961b83adfa82f94ee0a53daffected9a0045088d888c9c539c8c626a366cb52c0fbdab to < b5f46951e62377b6e406fadc18bc3c5bdf1632a7affected9a0045088d888c9c539c8c626a366cb52c0fbdab to < 9680c58675b82348ab84d387e4fa727f7587e1a0affected9a0045088d888c9c539c8c626a366cb52c0fbdab to < 557c024ca7250bb65ae60f16c02074106c2f197baffected
Linux Linux
Default version status: affected
2.6.26affected0 to < 2.6.26unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.134 to ≤ 6.6.*unaffected6.12.43 to ≤ 6.12.*unaffected6.15.11 to ≤ 6.15.*unaffected6.16.2 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/076e992752e4b24178918f748d75597c80a408d2 ↗
- https://git.kernel.org/stable/c/366183911b153e9b8cf758e1414e1154d7569337 ↗
- https://git.kernel.org/stable/c/112bb60cd0e254a369e95aa9941a694ffeca089f ↗
- https://git.kernel.org/stable/c/cddea0c721106ea480371412d8de21705eb27376 ↗
- https://git.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53d ↗
- https://git.kernel.org/stable/c/b5f46951e62377b6e406fadc18bc3c5bdf1632a7 ↗
- https://git.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0 ↗
- https://git.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197b ↗