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authorDenys Vlasenko <vda.linux@googlemail.com>2016-08-19 18:23:56 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2016-08-19 18:43:06 +0200
commit215b0ca6e4fe466c6942d21a1bba62d97f2d5e5d (patch)
tree4fbb9563d870ce8a5f8f08015424e358a1462677 /LICENSE
parentaedc3fe19fac368dc363050e0387d263b7e01cc6 (diff)
downloadbusybox-215b0ca6e4fe466c6942d21a1bba62d97f2d5e5d.tar.gz
hush: fix a bug in FEATURE_SH_STANDALONE=y config. Closes 9186
Run this in a "sh SCRIPT": sha256sum /dev/null echo END sha256sum is a NOEXEC applet. It runs in a forked child. Then child exit()s. By this time, entire script is read, and buffered in a FILE object from fopen("SCRIPT"). But fgetc() did not consume entire input. exit() lseeks back by -9 bytes, from <eof> to 'e' in 'echo'. (this may be libc-specific). This change of fd position *is shared with the parent*! Now parent can read more, and it thinks there is another "echo END". End result: two "echo END"s are run. Fix this by _exit()ing instead. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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