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| author | Rich Felker <dalias@aerifal.cx> | 2023-01-18 23:15:58 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2023-02-08 16:42:28 -0500 |
| commit | ea3b40a321e751e016948087ef23ae7b9e8e0150 (patch) | |
| tree | f4c353f26002191d8cfdb80e77aa1491773f4622 /include/sys | |
| parent | f897461d4fe72bb71854a6d0662de83008caccb7 (diff) | |
| download | musl-ea3b40a321e751e016948087ef23ae7b9e8e0150.tar.gz | |
fix integer overflow in WIFSTOPPED macro
the result of the 0xffff mask with the exit status could have bit 15
set, in which case multiplying by 0x10001 overflows 32-bit signed int.
making the multiply unsigned avoids the overflow. it also changes the
sign extension behavior of the subsequent >> operation, but the
affected bits are all unwanted anyway and all discarded by the cast to
short.
Diffstat (limited to 'include/sys')
| -rw-r--r-- | include/sys/wait.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/sys/wait.h b/include/sys/wait.h index d4b1f2e1..8ced671b 100644 --- a/include/sys/wait.h +++ b/include/sys/wait.h @@ -50,7 +50,7 @@ pid_t wait4 (pid_t, int *, int, struct rusage *); #define WSTOPSIG(s) WEXITSTATUS(s) #define WCOREDUMP(s) ((s) & 0x80) #define WIFEXITED(s) (!WTERMSIG(s)) -#define WIFSTOPPED(s) ((short)((((s)&0xffff)*0x10001)>>8) > 0x7f00) +#define WIFSTOPPED(s) ((short)((((s)&0xffff)*0x10001U)>>8) > 0x7f00) #define WIFSIGNALED(s) (((s)&0xffff)-1U < 0xffu) #define WIFCONTINUED(s) ((s) == 0xffff) |