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| -rw-r--r-- | shell/ash.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/shell/ash.c b/shell/ash.c index 789a81cc3..790367bd8 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -11659,9 +11659,18 @@ parsebackq: { str = NULL; savelen = out - (char *)stackblock(); if (savelen > 0) { + /* + * FIXME: this can allocate very large block on stack and SEGV. + * Example: + * echo "..<100kbytes>..`true` $(true) `true` ..." + * alocates 100kb for every command subst. With about + * a hundred command substitutions stack overflows. + * With larger prepended string, SEGV happens sooner. + */ str = alloca(savelen); memcpy(str, stackblock(), savelen); } + if (oldstyle) { /* We must read until the closing backquote, giving special * treatment to some slashes, and then push the string and |