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authorStefan Liebler <stli@linux.ibm.com>2018-09-06 14:27:03 +0200
committerStefan Liebler <stli@linux.ibm.com>2018-09-06 14:27:03 +0200
commit28669f86f6780a18daca264f32d66b1428c9c6f1 (patch)
tree5d84685410e38ea533838ad1785ad4d037b302a5 /sysdeps/unix
parenta33650d1a63b4e5d52ef02bb629d045c217e16ff (diff)
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Fix segfault in maybe_script_execute.
If glibc is built with gcc 8 and -march=z900, the testcase posix/tst-spawn4-compat crashes with a segfault. In function maybe_script_execute, the new_argv array is dynamically initialized on stack with (argc + 1) elements. The function wants to add _PATH_BSHELL as the first argument and writes out of bounds of new_argv. There is an off-by-one because maybe_script_execute fails to count the terminating NULL when sizing new_argv. ChangeLog: * sysdeps/unix/sysv/linux/spawni.c (maybe_script_execute): Increment size of new_argv by one.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/spawni.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c
index cf0213ece5..85239cedbf 100644
--- a/sysdeps/unix/sysv/linux/spawni.c
+++ b/sysdeps/unix/sysv/linux/spawni.c
@@ -101,7 +101,7 @@ maybe_script_execute (struct posix_spawn_args *args)
ptrdiff_t argc = args->argc;
/* Construct an argument list for the shell. */
- char *new_argv[argc + 1];
+ char *new_argv[argc + 2];
new_argv[0] = (char *) _PATH_BSHELL;
new_argv[1] = (char *) args->file;
if (argc > 1)