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history: fix out-of-bounds read on retrieving empty line

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Reproducer: Compile a ksh with AddressSanitizer. In that ksh, edit
the last command line with 'fc', insert an empty line at the start,
and save. Now use the up-arrow to retrieve the empty line. Ksh
aborts on history.c line 1011 as hist_copy() tries to read before
the beginning of the buffer pointed to by s1.

src/cmd/ksh93/edit/history.c: hist_copy():
- Verify that the s1 pointer was increased from the original s1
  before trying to read the character *(s1-1).
This commit is contained in:
Martijn Dekker 2022-07-10 20:12:10 +02:00
parent 893ea066f7
commit 7a01d6df47
3 changed files with 8 additions and 3 deletions
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4
NEWS
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@ -3,6 +3,10 @@ For full details, see the git log at: https://github.com/ksh93/ksh/tree/1.0
Any uppercase BUG_* names are modernish shell bug IDs.
2022-07-10:
- Fixed a potential crash on retrieving an empty line from the command history.
2022-07-09:
- Fixed a bug that broke '[[ ... ]]' test expressions for the command

5
src/cmd/ksh93/edit/history.c
View file

@ -982,7 +982,8 @@ int hist_copy(char *s1,int size,int command,int line)
register int c;
register History_t *hp = sh.hist_ptr;
register int count = 0;
register char *s1max = s1+size;
char *const s1orig = s1;
char *const s1max = s1 + size;
if(!hp)
return(-1);
hist_seek(hp,command);
@ -1008,7 +1009,7 @@ int hist_copy(char *s1,int size,int command,int line)
sfseek(hp->histfp,(off_t)0,SEEK_END);
if(s1==0)
return(count);
if(count && (c= *(s1-1)) == '\n')
if(count && s1 > s1orig && (c = *(s1 - 1)) == '\n')
s1--;
*s1 = '\0';
return(count);

2
src/cmd/ksh93/include/version.h
View file

@ -23,7 +23,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2022-07-09" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2022-07-10" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2022 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */