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Fix #1175, Use fstat and fchmod for TOCTOU Bug #1181

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merged 1 commit into from
Oct 3, 2022
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Fix #1175, Use fstat and fchmod for TOCTOU Bug #1181

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14 changes: 8 additions & 6 deletions ut_assert/src/uttools.c
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Original file line number Diff line number Diff line change
Expand Up @@ -57,14 +57,15 @@ typedef struct
bool UtMem2BinFile(const void *Memory, const char *Filename, uint32 Length)
{
FILE * fp;
int fd;
struct stat dststat;

if ((fp = fopen(Filename, "w")))
{
if (stat(Filename, &dststat) == 0)
fd = fileno(fp);
if (fstat(fd, &dststat) == 0)
{
chmod(Filename, dststat.st_mode & ~(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
stat(Filename, &dststat);
fchmod(fd, dststat.st_mode & ~(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
}

fwrite(Memory, Length, 1, fp);
Expand Down Expand Up @@ -106,14 +107,15 @@ bool UtMem2HexFile(const void *Memory, const char *Filename, uint32 Length)
FILE * fp;
uint32 i;
uint32 j;
int fd;
struct stat dststat;

if ((fp = fopen(Filename, "w")))
{
if (stat(Filename, &dststat) == 0)
fd = fileno(fp);
if (fstat(fd, &dststat) == 0)
{
chmod(Filename, dststat.st_mode & ~(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
stat(Filename, &dststat);
fchmod(fd, dststat.st_mode & ~(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
}

for (i = 0; i < Length; i += 16)
Expand Down