rtld: Check __libc_enable_secure before honoring LD_PREFER_MAP_32BIT_EXEC (CVE-2019-19126) [BZ #25204]
The problem was introduced in glibc 2.23, in commit
b9eb92ab05
("Add Prefer_MAP_32BIT_EXEC to map executable pages with MAP_32BIT").
(cherry picked from commit d5dfad4326fc683c813df1e37bbf5cf920591c8e)
Change-Id: Ib782573b4623ee3edfa9f98ad62f69b9d8edcb27
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parent
845278f2c6
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NEWS
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NEWS
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@ -35,6 +35,7 @@ The following bugs are resolved with this release:
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[24744] io: Remove the copy_file_range emulation
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[24986] alpha: new getegid, geteuid and getppid syscalls used
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unconditionally
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[25204] Ignore LD_PREFER_MAP_32BIT_EXEC for SUID programs
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Security related changes:
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@ -31,7 +31,8 @@
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environment variable, LD_PREFER_MAP_32BIT_EXEC. */
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#define EXTRA_LD_ENVVARS \
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case 21: \
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if (memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0) \
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if (!__libc_enable_secure \
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&& memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0) \
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GLRO(dl_x86_cpu_features).feature[index_arch_Prefer_MAP_32BIT_EXEC] \
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|= bit_arch_Prefer_MAP_32BIT_EXEC; \
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break;
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