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| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-02-02 15:48:06 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-02-02 15:50:24 +0530 |
| commit | ed8d5ffd0a14e84298a15ae2ec9b799010166b28 (patch) | |
| tree | 6cabcdeec197523b72b6e88a1910cd97176f766d /elf | |
| parent | 8b9e9c3c0bae497ad5e2d0ae2f333f62feddcc12 (diff) | |
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Drop GLIBC_TUNABLES for setxid programs when tunables is disabled (bz #21073)
A setxid program that uses a glibc with tunables disabled may pass on
GLIBC_TUNABLES as is to its child processes. If the child process
ends up using a different glibc that has tunables enabled, it will end
up getting access to unsafe tunables. To fix this, remove
GLIBC_TUNABLES from the environment for setxid process.
* sysdeps/generic/unsecvars.h: Add GLIBC_TUNABLES.
* elf/tst-env-setuid-tunables.c
(test_child_tunables)[!HAVE_TUNABLES]: Verify that
GLIBC_TUNABLES is removed in a setgid process.
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/tst-env-setuid-tunables.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/elf/tst-env-setuid-tunables.c b/elf/tst-env-setuid-tunables.c index a563f69972..a5f0a81ef3 100644 --- a/elf/tst-env-setuid-tunables.c +++ b/elf/tst-env-setuid-tunables.c @@ -36,6 +36,7 @@ test_child_tunables (void) { const char *val = getenv ("GLIBC_TUNABLES"); +#if HAVE_TUNABLES if (val != NULL && strcmp (val, CHILD_VALSTRING_VALUE) == 0) return 0; @@ -43,6 +44,14 @@ test_child_tunables (void) printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val); return 1; +#else + if (val != NULL) + { + printf ("GLIBC_TUNABLES not cleared\n"); + return 1; + } + return 0; +#endif } static int |