CVE-2024-42265: protect the fetch of ->fd[fd] in do_dup2() from mispredictions

Description

In the Linux kernel, the following vulnerability has been resolved: protect the fetch of ->fd[fd] in do_dup2() from mispredictions both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.

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

8280d16172243702ed43432f826ca6130edb4086 to < ed42e8ff509d2a61c6642d1825032072dab79f26affected
8280d16172243702ed43432f826ca6130edb4086 to < 41a6c31df77bd8e050136b0a200b537da9e1084aaffected
8280d16172243702ed43432f826ca6130edb4086 to < 08775b3d6ed117cf4518754ec7300ee42b6a5368affected
8280d16172243702ed43432f826ca6130edb4086 to < 3f480493550b6a23d3a65d095d6569d4a7f56a0faffected
8280d16172243702ed43432f826ca6130edb4086 to < 5db999fff545b924b24c9afd368ef5c17279b176affected
8280d16172243702ed43432f826ca6130edb4086 to < da72e783afd27d9f487836b2e6738146c0edd149affected
8280d16172243702ed43432f826ca6130edb4086 to < 1171ceccabfd596ca370c5d2cbb47d110c3f2fe1affected
8280d16172243702ed43432f826ca6130edb4086 to < 8aa37bde1a7b645816cda8b80df4753ecf172bf1affected

Linux Linux

Default version status: affected

3.7affected
0 to < 3.7unaffected
4.19.320 to ≤ 4.19.*unaffected
5.4.282 to ≤ 5.4.*unaffected
5.10.224 to ≤ 5.10.*unaffected
5.15.165 to ≤ 5.15.*unaffected
6.1.104 to ≤ 6.1.*unaffected
6.6.45 to ≤ 6.6.*unaffected
6.10.4 to ≤ 6.10.*unaffected
6.11 to ≤ *unaffected

CVE-2024-42265

protect the fetch of ->fd[fd] in do_dup2() from mispredictions

Description

Affected products

Linux Linux

Linux Linux

References