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110 lines
3.6 KiB
110 lines
3.6 KiB
BASH PATCH REPORT
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=================
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Bash-Release: 5.0
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Patch-ID: bash50-005
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Bug-Reported-by: Brad Spencer <bspencer@blackberry.com>
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Bug-Reference-ID: <1b993ff2-ce4f-662a-6be4-393457362e47@blackberry.com>
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Bug-Reference-URL: http://lists.gnu.org/archive/html/bug-bash/2019-01/msg00250.html
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Bug-Description:
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In certain cases, bash optimizes out a fork() call too early and prevents
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traps from running.
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Patch (apply with `patch -p0'):
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*** ../bash-5.0-patched/command.h 2018-07-20 21:16:31.000000000 -0400
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--- command.h 2019-02-20 11:09:36.000000000 -0500
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***************
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*** 187,190 ****
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--- 188,192 ----
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#define CMD_LASTPIPE 0x2000
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#define CMD_STDPATH 0x4000 /* use standard path for command lookup */
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+ #define CMD_TRY_OPTIMIZING 0x8000 /* try to optimize this simple command */
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/* What a command looks like. */
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*** ../bash-5.0-patched/builtins/evalstring.c 2018-12-26 11:19:21.000000000 -0500
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--- builtins/evalstring.c 2019-01-29 14:15:19.000000000 -0500
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***************
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*** 101,104 ****
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--- 101,113 ----
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}
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+ int
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+ can_optimize_connection (command)
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+ COMMAND *command;
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+ {
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+ return (*bash_input.location.string == '\0' &&
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+ (command->value.Connection->connector == AND_AND || command->value.Connection->connector == OR_OR || command->value.Connection->connector == ';') &&
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+ command->value.Connection->second->type == cm_simple);
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+ }
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+
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void
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optimize_fork (command)
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***************
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*** 106,110 ****
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{
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if (command->type == cm_connection &&
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! (command->value.Connection->connector == AND_AND || command->value.Connection->connector == OR_OR) &&
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should_suppress_fork (command->value.Connection->second))
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{
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--- 115,120 ----
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{
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if (command->type == cm_connection &&
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! (command->value.Connection->connector == AND_AND || command->value.Connection->connector == OR_OR || command->value.Connection->connector == ';') &&
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! (command->value.Connection->second->flags & CMD_TRY_OPTIMIZING) &&
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should_suppress_fork (command->value.Connection->second))
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{
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***************
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*** 413,418 ****
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command->value.Simple->flags |= CMD_NO_FORK;
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}
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! else if (command->type == cm_connection)
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! optimize_fork (command);
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#endif /* ONESHOT */
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--- 423,438 ----
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command->value.Simple->flags |= CMD_NO_FORK;
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}
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!
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! /* Can't optimize forks out here execept for simple commands.
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! This knows that the parser sets up commands as left-side heavy
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! (&& and || are left-associative) and after the single parse,
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! if we are at the end of the command string, the last in a
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! series of connection commands is
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! command->value.Connection->second. */
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! else if (command->type == cm_connection && can_optimize_connection (command))
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! {
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! command->value.Connection->second->flags |= CMD_TRY_OPTIMIZING;
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! command->value.Connection->second->value.Simple->flags |= CMD_TRY_OPTIMIZING;
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! }
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#endif /* ONESHOT */
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*** ../bash-5.0-patched/execute_cmd.c 2018-12-05 09:05:14.000000000 -0500
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--- execute_cmd.c 2019-01-25 15:59:00.000000000 -0500
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***************
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*** 2768,2771 ****
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--- 2768,2773 ----
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(exec_result != EXECUTION_SUCCESS)))
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{
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+ optimize_fork (command);
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+
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second = command->value.Connection->second;
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if (ignore_return && second)
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*** ../bash-5.0/patchlevel.h 2016-06-22 14:51:03.000000000 -0400
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--- patchlevel.h 2016-10-01 11:01:28.000000000 -0400
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***************
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*** 26,30 ****
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looks for to find the patch level (for the sccs version string). */
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! #define PATCHLEVEL 4
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#endif /* _PATCHLEVEL_H_ */
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--- 26,30 ----
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looks for to find the patch level (for the sccs version string). */
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! #define PATCHLEVEL 5
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#endif /* _PATCHLEVEL_H_ */
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