On unix, for certain error codes of read()/pread() return

SQLITE_IOERR_CORRUPTFS instead of SQLITE_IOERR_READ.  And then convert this
error into SQLITE_CORRUPT prior to returning back to the application.

FossilOrigin-Name: 9538ea8447e7b07c05197d6ff2208d3e97b45798736c85b63e8f0c7a3a98c1f3

manifest

@@ -1,5 +1,5 @@
-C Fix\strivial\smemory\sleaks\sin\sthe\sshell\sand\ssqldiff\sprograms.
-D 2020-11-17T21:09:56.874
+C On\sunix,\sfor\scertain\serror\scodes\sof\sread()/pread()\sreturn\nSQLITE_IOERR_CORRUPTFS\sinstead\sof\sSQLITE_IOERR_READ.\s\sAnd\sthen\sconvert\sthis\nerror\sinto\sSQLITE_CORRUPT\sprior\sto\sreturning\sback\sto\sthe\sapplication.
+D 2020-11-18T12:48:48.926
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -503,7 +503,7 @@ F src/insert.c 7e081d33aab4a9d761c39dccf3c3872c35501565d2ed9db66301918d23bc7901
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 436af4968c6954d304fce9efa12719367bd8f37b19b93b71d6ad607e85adbb47
 F src/main.c 54d61d1e94f225636053c862c930d7dd7b29162b93d3f3ecb00439910ccba02a
-F src/malloc.c 413b0ffea2b45c37c6cf2ed5509f6d6b508b0a033caa9b4bf90bed4ee044a2ff
+F src/malloc.c cef96fefb95a0d581a85207c61fbe4ec67cafc35dbe6556d1f7a50912b9a98a0
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c c12a42539b1ba105e3707d0e628ad70e611040d8f5e38cf942cee30c867083de
 F src/mem2.c b93b8762ab999a29ae7751532dadf0a1ac78040308a5fb1d17fcc365171d67eb
@@ -522,7 +522,7 @@ F src/os.c 80e4cf3e5da06be03ca641661e331ce60eeeeabf0d7354dbb1c0e166d0eedbbe
 F src/os.h 48388821692e87da174ea198bf96b1b2d9d83be5dfc908f673ee21fafbe0d432
 F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
 F src/os_setup.h 0dbaea40a7d36bf311613d31342e0b99e2536586
-F src/os_unix.c ff10667369f3b05aa697278a72d58fe7a43aaa674cb3fa9654d0fe21cda265d0
+F src/os_unix.c cfd1ee5f8a5def522aa0ebf4eec6b30533b4bdb8c76df7cf77dc5c2b790d957d
 F src/os_win.c 77d39873836f1831a9b0b91894fec45ab0e9ca8e067dc8c549e1d1eca1566fe9
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
 F src/pager.c 3700a1c55427a3d4168ad1f1b8a8b0cb9ace1d107e4506e30a8f1e66d8a1195e
@@ -540,7 +540,7 @@ F src/resolve.c 1948a92ca9eab776632816b97e57c61d933474a78aad4f4ef835c916a83dbb1c
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
 F src/select.c 31387e56f5e6d1adc798dfa04b946001289a61e65acf4615f7b7130f121f3b9c
 F src/shell.c.in 2871f579186e71db54cdf6b262951d2cd88aa61747a3f3e745ade425268fd6f6
-F src/sqlite.h.in ff32663b457306eb88c3039868280aa39da31162ed69c4e71fa8e028684e7277
+F src/sqlite.h.in 70a0c35d729f16e9b57d29e371f2f090c3fda1d0e007df0c446df5560710dd40
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 2d1af80082edffd71c6f96f70ad1ce6a4fb46615ad10291fc77fe0dea9ff0197
 F src/sqliteInt.h c01115c8dd967f7d334a98ba37ac821eafb04144c8085a795daaf2185743d27a
@@ -1885,7 +1885,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P b192fdddb63ac56fd6725032af110a069baac52347c0012c130bf34f3cbe69e4
-R c82023e65720caa1007ee5d3c2933c2e
-U dan
-Z 63e7d3fc62cc2655e0b754cd1bdd484b
+P 272793e5edc47e431be77d589718a001f2696869e3e15f1371a1890645a995a7
+R 09dfc711a919e75411f1e82c3f8f4a30
+T *branch * detect-corrupt-fs
+T *sym-detect-corrupt-fs *
+T -sym-trunk *
+U drh
+Z c20eedee5ebf78255c7079df1f62b80f

manifest.uuid

@@ -1 +1 @@
-272793e5edc47e431be77d589718a001f2696869e3e15f1371a1890645a995a7
+9538ea8447e7b07c05197d6ff2208d3e97b45798736c85b63e8f0c7a3a98c1f3

src/malloc.c

@@ -791,13 +791,19 @@ void sqlite3OomClear(sqlite3 *db){
 }
 
 /*
-** Take actions at the end of an API call to indicate an OOM error
+** Take actions at the end of an API call to deal with error codes.
 */
-static SQLITE_NOINLINE int apiOomError(sqlite3 *db){
+static SQLITE_NOINLINE int apiHandleError(sqlite3 *db, int rc){
+  if( db->mallocFailed || rc==SQLITE_IOERR_NOMEM ){
     sqlite3OomClear(db);
     sqlite3Error(db, SQLITE_NOMEM);
     return SQLITE_NOMEM_BKPT;
   }
+  if( rc==SQLITE_IOERR_CORRUPTFS ){
+    return SQLITE_CORRUPT_BKPT;
+  }
+  return rc & db->errMask;
+}
 
 /*
 ** This function must be called before exiting any API function (i.e. 
@@ -818,8 +824,8 @@ int sqlite3ApiExit(sqlite3* db, int rc){
   */
   assert( db!=0 );
   assert( sqlite3_mutex_held(db->mutex) );
-  if( db->mallocFailed || rc==SQLITE_IOERR_NOMEM ){
-    return apiOomError(db);
+  if( db->mallocFailed || rc ){
+    return apiHandleError(db, rc);
   }
   return rc & db->errMask;
 }

src/os_unix.c

@@ -3375,7 +3375,25 @@ static int unixRead(
   if( got==amt ){
     return SQLITE_OK;
   }else if( got<0 ){
-    /* lastErrno set by seekAndRead */
+    /* pFile->lastErrno has been set by seekAndRead().
+    ** Usually we return SQLITE_IOERR_READ here, though for some
+    ** kinds of errors we return SQLITE_IOERR_CORRUPTFS.  The
+    ** SQLITE_IOERR_CORRUPTFS will be converted into SQLITE_CORRUPT
+    ** prior to returning to the application by the sqlite3ApiExit()
+    ** routine.
+    */
+    switch( pFile->lastErrno ){
+      case ERANGE:
+      case ENOENT:
+      case EIO:
+#ifdef ENXIO
+      case ENXIO:
+#endif
+#ifdef EDEVERR
+      case EDEVERR:
+#endif
+        return SQLITE_IOERR_CORRUPTFS;
+    }
     return SQLITE_IOERR_READ;
   }else{
     storeLastErrno(pFile, 0);   /* not a system error */

src/sqlite.h.in

@@ -504,6 +504,7 @@ int sqlite3_exec(
 #define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
 #define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
 #define SQLITE_IOERR_DATA              (SQLITE_IOERR | (32<<8))
+#define SQLITE_IOERR_CORRUPTFS         (SQLITE_IOERR | (33<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))