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Don't Block Removing File on Being Able to Read It

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`open()`'s mode bits are only applied to files that are created by the call.
If the output file already exists, but is not readable, the `fopen()` would
fail, preventing us from removing it, which would mean that the file would
not end up with the correct permission bits.

It's not clear to me why the `fopen()` is there at all. `UTIL_isRegularFile()`
should be sufficient, AFAICT.
This commit is contained in:
W. Felix Handte
2021-03-08 17:49:20 -05:00
parent b87f97b3ea
commit 1fb10ba831
2 changed files with 28 additions and 16 deletions
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5
programs/fileio.c
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@@ -669,7 +669,6 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
if (UTIL_isRegularFile(dstFileName)) {
/* Check if destination file already exists */
FILE* const fCheck = fopen( dstFileName, "rb" );
#if !defined(_WIN32)
/* this test does not work on Windows :
* `NUL` and `nul` are detected as regular files */
@@ -678,8 +677,6 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
dstFileName);
}
#endif
if (fCheck != NULL) { /* dst file exists, authorization prompt */
fclose(fCheck);
if (!prefs->overwrite) {
if (g_display_prefs.displayLevel <= 1) {
/* No interaction possible */
@@ -693,7 +690,7 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
}
/* need to unlink */
FIO_removeFile(dstFileName);
} }
}
{ const int fd = open(dstFileName, O_WRONLY|O_CREAT|O_TRUNC, mode);
FILE* f = NULL;

15
tests/playTests.sh
View File

@@ -513,6 +513,21 @@ if [ "$isWindows" = false ] ; then
rm -f tmp1.zst tmp2.zst tmp1.out tmp2.out
println "test : check permissions on pre-existing output file in compression "
chmod 0600 tmp1
touch tmp1.zst
chmod 0400 tmp1.zst
zstd -f tmp1 -o tmp1.zst
assertFilePermissions tmp1.zst 600
println "test : check permissions on pre-existing output file in decompression "
chmod 0400 tmp1.zst
touch tmp1.out
chmod 0200 tmp1.out
zstd -f -d tmp1.zst -o tmp1.out
assertFilePermissions tmp1.out 400
rm -f tmp1.zst tmp1.out
umask 0666
chmod 0666 tmp1 tmp2