diff options
| -rw-r--r-- | NEWS | 7 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h | 3 |
2 files changed, 9 insertions, 1 deletions
@@ -74,6 +74,12 @@ Security related changes: memcmp gave the wrong result since it treated the size argument as zero. Reported by H.J. Lu. + CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC + environment variable during program execution after a security + transition, allowing local attackers to restrict the possible mapping + addresses for loaded libraries and thus bypass ASLR for a setuid + program. Reported by Marcin Kościelnicki. + The following bugs are resolved with this release: [20116] nptl: use after free in pthread_create @@ -98,6 +104,7 @@ The following bugs are resolved with this release: [24027] malloc: Integer overflow in realloc [24097] Can't use 64-bit register for size_t in assembly codes for x32 (CVE-2019-6488) [24155] x32 memcmp can treat positive length as 0 (if sign bit in RDX is set) (CVE-2019-7309) + [25204] Ignore LD_PREFER_MAP_32BIT_EXEC for SUID programs Version 2.24 diff --git a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h index 1c67050..513735a 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h +++ b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h @@ -31,7 +31,8 @@ environment variable, LD_PREFER_MAP_32BIT_EXEC. */ #define EXTRA_LD_ENVVARS \ case 21: \ - if (memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0) \ + if (!__libc_enable_secure \ + && memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0) \ GLRO(dl_x86_cpu_features).feature[index_arch_Prefer_MAP_32BIT_EXEC] \ |= bit_arch_Prefer_MAP_32BIT_EXEC; \ break; |