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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2022-01-13 11:28:36 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2022-01-21 23:01:30 +0530
commitee8d5e33adb284601c00c94687bc907e10aec9bb (patch)
treec1e3b5584266640b915abcbd151032935b9695fb /stdlib/Makefile
parentfb7bff12e81c677a6622f724edd4d4987dd9d971 (diff)
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realpath: Set errno to ENAMETOOLONG for result larger than PATH_MAX [BZ #28770]
realpath returns an allocated string when the result exceeds PATH_MAX,
which is unexpected when its second argument is not NULL.  This results
in the second argument (resolved) being uninitialized and also results
in a memory leak since the caller expects resolved to be the same as the
returned value.

Return NULL and set errno to ENAMETOOLONG if the result exceeds
PATH_MAX.  This fixes [BZ #28770], which is CVE-2021-3998.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'stdlib/Makefile')
-rw-r--r--stdlib/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index 1e81f98fac..8236741984 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -109,6 +109,7 @@ tests := \
   tst-random \
   tst-random2 \
   tst-realpath \
+  tst-realpath-toolong \
   tst-secure-getenv \
   tst-setcontext \
   tst-setcontext2 \